Prospects for malaria control through manipulation of mosquito larval habitats and olfactory-mediated behavioural responses using plant-derived compounds
© The Author(s). 2017
Received: 24 October 2016
Accepted: 29 March 2017
Published: 17 April 2017
Malaria presents an overwhelming public health challenge, particularly in sub-Saharan Africa where vector favourable conditions and poverty prevail, potentiating the disease burden. Behavioural variability of malaria vectors poses a great challenge to existing vector control programmes with insecticide resistance already acquired to nearly all available chemical compounds. Thus, approaches incorporating plant-derived compounds to manipulate semiochemical-mediated behaviours through disruption of mosquito olfactory sensory system have considerably gained interests to interrupt malaria transmission cycle. The combination of push-pull methods and larval control have the potential to reduce malaria vector populations, thus minimising the risk of contracting malaria especially in resource-constrained communities where access to synthetic insecticides is a challenge. In this review, we have compiled information regarding the current status of knowledge on manipulation of larval ecology and chemical-mediated behaviour of adult mosquitoes with plant-derived compounds for controlling mosquito populations. Further, an update on the current advancements in technologies to improve longevity and efficiency of these compounds for field applications has been provided.
KeywordsMalaria Vector control Anopheline mosquitoes Plant-derived compounds Larval habitat manipulation Mosquito functional ecology Integrated vector management
Ever since mosquitoes were discovered to transmit malaria parasites more than a century ago [1, 2], malaria remains a significant threat to human life, with major fatalities disproportionately inflicting children of less than 5 years and pregnant women . Significant decline in global disease burden has been reported by various surveillance studies between 2000 and 2015 following intensive deployment of key interventions: indoor residual spraying (IRS), long-lasting insecticide treated nets (LLINs) and artemisinin-based combination therapies (ACTs) [4, 5]. However, the epidemiological burden of malaria persists in sub-Saharan Africa due to inevitable drug and insecticide-induced resistance [6–8]. This is reflected by residual transmission to the vulnerable groups that accounted for 92% of global deaths reported from African region in 2016 . Residual transmission, which is characterised by shifts in vector feeding patterns, variation in species composition, insecticide-induced behavioural avoidance from IRS and LLINs, outdoor resting and increased outdoor parasite transmission, has emerged following the operational scale-up of these interventions [9–11]. It is postulated that the current tools could lead towards malaria elimination in various epidemiological settings by suppressing vectorial capacity . Yet, the inexhaustive protection implicated by these interventions coupled with reduced susceptibility of malaria vectors to insecticides increases exposure risk and requires pivotal approaches to reduce the annual entomological inoculation rates (EIRs) to less than 1 [10, 13].
Since the inception of integrated vector management (IVM) model by Major Williams C. Grogas in the early 20th century and its adoption by world health organization (WHO) in 2004, significant research has been conducted in search of novel strategies to disrupt disease transmission cycle [14, 15]. These include genetic modification (sterile insect technique (SIT) and paratransgenesis), the use of microbial larvicides, transmission blocking interventions, mosquito behavioral modification, and the recent CRISPR Cas-9 mediated disruption of mosquito reproduction. However, one of the intriguing questions is: why is the fight against malaria still beyond the horizon? To address this fundamental question, Ferguson et al. pointed out that mosquito ecology stands out as the greatest obstacle to malaria elimination and eradication . As many countries within the geographical malaria fringe strive to enter elimination phase, vector control, and the ultimate disruption of Plasmodium falciparum transmission cycle is faced with a multitude of challenges encompassing mosquito ecology, and a clear understanding is required to drive the envisioned goal to its realisation. According to Ferguson et al. the complexity of vector populations that evade control interventions , genetic variation of mosquito behaviour [17, 18], insecticide resistance [19, 20], and environmental changes  constitute the dynamic complex of mosquito ecology that favour propagation of parasite sporogonic stages. While major progress has been made to understand the ecology of malaria vectors, constraints in fully unravelling the interactions with other bio-factors within the ecosystem (such as competitors, predators, and preys in food web complexes) for amplification of malaria transmission risks present a great challenge towards malaria eradication . Russell et al. proposed that the effective control of malaria could also be improved by approaches aimed at manipulating the adult vector behaviours that lead to outdoor transmission through avoidance of IRS-targeted killing .
In essence, mosquitoes require and acquire vital resources from the immediate environment to complete their life-cycle, and in turn, facilitate transmission of P. falciparum parasites to humans. These resources include aquatic breeding sites, carbohydrate sugar sources, blood hosts, and resting places which influence the capacity of mosquitoes to transmit malaria parasites. Despite the high ownership of LLINs and intensive IRS in malaria hotspots, these interventions have failed to break the transmission cycle sufficiently and to linearly push EIR to levels required for local elimination, a scenario creating malaria transmission heterogeneities [12, 23]. Entomological surveillance studies indicate that emergence of behaviorally-resistant and aggressive vectors that evade targeted killing of IRS and LLINs has contributed to high rates of outdoor P. falciparum transmission in different epidemiological regions [24, 25]. Imperatively, interruption of malaria transmission would require integrative interventions that limit mosquitoes from acquiring these resources. Therefore, in addition to the first line interventions (IRS and LLINs), larviciding and the mosquito olfactory system appears to be the targetable Achilles heel  that could be explored to considerably improve control of vector populations and malaria vector annual inoculation rates. There is a close association between vector density and entomological inoculation rates which are paramount parameters of vectorial capacity and malaria epidemiology . Indeed, the vector-parasite-host interactions such as host seeking, blood feeding, parasite development and successful transmission to a natural mammalian host are fine-tuned by the mosquito larval ecology  in which olfactory system plays a primordial role . Given the above, the quality of environment which the juvenile aquatic stages encounter during their development fundamentally influences the success of resultant adult mosquitoes as vectors [28, 30]. Consequently, suboptimal larval conditions have been reported to negatively implicate vector life history traits such as adult female body size, blood meal acquisition frequency and volume, reproductive viability and cycles, and vector longevity which directly impact vectorial capacity and competence [28, 31, 32].
Functional ecology of malaria vectors
Another important aspect of mosquito functional ecology with a great impact on vectorial capacity and malaria epidemiology is oviposition site selection, a critical factor in population dynamics. Evolutionarily, irrespective of the state of insecticide susceptibility, biting tendency and resting places, gravid female mosquitoes face the challenge of locating an appropriate oviposition site that guarantees progeny development and survival . Following mating and bloodmeal acquisition, physiological changes that influence egg development and subsequent behaviour of searching an oviposition site ensue . In addition to visual and tactile cues, the gravid females use to a larger extent olfactory signals to discriminatively select potential breeding sites [58–60]. A considerable number of field studies have reported the role of volatile organic semiochemicals emanating from aquatic habitats to attract or repel mosquitoes in a push-pull manner [61–65]. These semiochemicals interact with female chemoreceptors for cognition before egg laying process . For example, in the event of characterising odour coding in mosquitoes, Carey et al.  and Rinker et al.  demonstrated that perception of oviposition cues such as 3-methylindole, indole, 2-propylphenol, and 4-methylcyclohexanol by female chemoreceptors could be presumably responsible for inducing egg laying. Importantly, volatile organic compounds produced by habitat-associated bacteria such as fatty acids, aromatic amino acids (L-tyrosine, L-phenylalanine and L-tryptophan), and carbohydrates show attraction to Aedes aegypti and Culex pipiens [67, 68]. While efforts to identify the key compounds mediating attraction and selective behaviour in mosquitoes had been made decades ago for Aedes and Culex , those responsive to anophelines lagged behind . It was until recently when Lindh et al.  reported cedrol, a fermentation metabolite produced by fungi found on rhizomes of Cyperus rotundus grass, as a strong oviposition attractant for gravid An. gambiae (s.s.) mosquitoes that aroused interests to characterise anopheline oviposition ecology. In course, Wondwosen et al.  showed that volatiles from various rice cultivars strongly attracts gravid An. arabiensis females. In this study, using electrophysiology and chemical analyses, the authors demonstrated that headspace rice volatiles rich in β-caryophyllene, decanal, sulcatone (6-methyl-5-hepten-2-one) and limonene elicited antennal responses that on evaluation with BioGent (BG) sentinel traps stimulated long range oviposition site seeking behaviour. Elsewhere, Eneh et al.  reported that p-cresol, a strong oviposition attractant of Aedes and Culex from Bermuda grass (Cynodon dactylon) hay infusion, elicited avoidance response to gravid An. gambiae (s.s.). Cumulatively, these studies open avenues for the search of other compounds acting together to mediate the responses that could aid in developing not only general but also species-specific oviposition deterrents or attractive lethal ovitraps (ALOTs). Studies characterising the bio-physicochemical parameters of larval habitats show that habitat selection by female mosquitoes is species-specific and anopheline mosquitoes prefer shallow, temporary, less turbid, and open sunlit water bodies with adequate food resources and absence of predators [74–76]. However, in some extreme cases, these larvae have been reported to colonise polluted urban waters, a phenomenon depicting some form of adaptive divergence . Also, the observed proximity of anopheline larval habitats to human dwellings was suggested to be an evolutionary strategy of mosquitoes to conserve energy for host seeking . Therefore, interventions aimed at manipulating or disrupting the sensory signals in mosquitoes could lead to abrogation of olfactory-driven behaviours that contribute to malaria transmission [45, 79].
Indeed, approaches that target the behavioural attributes of adult mosquito vectors and their juvenile aquatic stages using chemical insecticides have been shown to substantially reduce mosquito populations [80–82]. However, the negative implications such as chemical pollution, loss of biodiversity, and the emergence of resistance associated with their application call for urgent interventions that safeguard environmental health as well as effectively reduce the risk of malaria transmission . Over time, a paradigm shift in vector control has been experienced as the application of natural products especially from plants continues to be appreciated [84–88]. Hence, prospecting for bioactive chemistries from natural sources forms a basis for developing eco-friendly insecticides with less impact on biodiversity [89, 90]. Various approaches ranging from basic evaluation to complex molecular and in silico ligand docking studies, in search of inexpensive, safe, and effective classes of compounds have been deployed as pathways for developing new mosquito control agents [91, 92]. Although this does not guarantee 100% resistance-resilience, we feel that motivation for studying plant-based insecticides vis-à-vis their synthetic counterparts originate from previous reports showing few or no cases of resistance development to natural compounds derived from plants. In nature, plants constitutively and inductively synthesise a myriad of bioactive allelochemicals such as alkaloids, terpenoids, flavonoids, coumarins, glycosides, steroids, tannins, protease inhibitors, phenolics and growth regulators to counteract environmental stress effects and herbivory attacks [93, 94]. These harmful compounds have the potential of controlling both medically and veterinary important disease-transmitting insect vectors owing to their chemistry and structural characteristics that alter the normal physiology of insects, thus reducing their fitness and performance .
This review mainly focuses on the manipulation of larval habitats and chemical-mediated behaviour of adult mosquitoes using plant-based chemicals for reduced risk of malaria transmission. On application, plant-derived compounds could alter the immediate chemical ecology of mosquitoes disrupting the olfactory-mediated location of vital resources required for completing their life-cycle and transmitting malaria parasites. Importantly, we demonstrate how these compounds could be incorporated into IVM programmes for mosquito control.
Push-pull technology for control of adult mosquitoes
The push-pull approach is not a new terminology in the context of pest management. The technique was first developed by Australian researchers, Pyke et al.  to manipulate the distribution of cotton pests of Helicoverpa spp. By then, scientific information on behavioural manipulation for controlling nuisance insects was rudimentary. A comprehensive review compiled by Foster & Harris  advanced and provided a clear understanding of behavioural manipulation for pest management that involves the use of stimuli to activate or inhibit a behaviour thereby changing its expression. From this knowledge, a push-pull approach for controlling mosquito vector populations by manipulating the vector behaviour and their relative spatiotemporal distribution for trapping and subsequent killing of the trapped insect vectors was conceptualised and adapted about 20 years later . This technology has been successfully applied for controlling populations of mosquitoes , tsetse flies , as well as stem borers and Striga weeds from maize plantations [100–102]. In this context, repellents and baits are integratively deployed for driving the mosquitoes away from their vertebrate hosts and luring them towards the trap. For instance, the combinatorial use of a trap baited with an attractant blend that simulated human sweat and a microencapsulated synthetic repellent (δ-undecalactone) in malaria endemic region of western Kenya reduced mosquito house entry by more than 50% and high numbers of outdoor flying mosquitoes captured . Although the use of repellents may deflect mosquitoes from repellent users to non-users , the dual deployment of repellents and attractive traps in push-pull systems would reduce vector densities and EIRs experienced by unprotected people in epidemiological settings by substantial fold . Under such conditions, mosquito olfactory system acts as the possible target to deprive acquisition of resources from the host and environment. Carey & Carlson  pointed out that utilisation of cheap, stable and less hazardous compounds that either stimulate or inhibit mosquito odorant receptors, gustatory receptors and ionotropic receptors could lead to the development of effective, eco-friendly vector control tools that overcome the challenges faced by the current mosquito control strategies. Thus, in an attempt to implement this robust system at remote settings, the design of low-tech and non-power dependent traps that deploy natural products is highly encouraged to reduce human-biting mosquito populations. Combined use of plant-derived compounds with repellent and luring characteristics has the potential of designing such novel push-pull systems. For example, nepetalactone from Nepeta cataria (catnip) essential oil  and linalool oxide  are potent plant-based compounds that could be utilised in the “push” and “pull” effects, respectively. Inspirations from this technique have observed considerable success in the small scale mass trapping of mosquitoes and are currently under field expansion trials in Kenya and Tanzania [103, 107]. To discuss how plant-derived compounds could be applicable in the push-pull approach, we have split it into plant-derived insect repellents and ‘attract and kill’ phenomenon using toxic sugar baits.
Plant-derived insect repellents
An insect repellent is presumably a compound that acts singly or in a cocktail of others to successfully deter a nuisance insect from locating the source of attractive host stimuli. Based on the induced insect behaviour, repellents can be broadly classified into; stimuli-irritants, odour masking and feeding deterrents . In this context of mosquitoes, by sensing or coming into contact with the compound, stimuli-irritants induce behavioural avoidance from the source of the chemical. Odour masking compounds reduce the abundance of host attractive cues while feeding deterrents interfere with bloodmeal and nectar sugar acquisition. To mediate repellent effect, the sensation of these aversive compounds to mosquito sensilla may activate specific insect ORs, block firing of neuron currents or disrupt behavioural responses [109–111]. It remains a hot debate within the malaria community on whether to repel or kill mosquitoes . Nevertheless, the aim of either topical or spatial application of repellents is to disrupt the mosquito olfactory signalling and subsequent host-seeking behaviour.
Before the advent of synthetic chemical repellents, man used and still uses plants with repellent characteristics to drive away mosquitoes with or without the knowledge of their efficacy, mode of action and their safety . As early as 1901, botanical derivatives such as essential oils of citronella (Cymbopogon spp), neem (Azadirachta indica) and lemon eucalyptus (Eucalyptus maculata) were used in ancient Greece, Egypt, China, India and even northern America to ward off biting insects and protect crops against destructive pests . These botanicals are effective even up-to-date, however, due to their high volatilization, their reliability dropped in 1953 for synthetic repellent DEET (N, N-diethyl-3-methylbenzamide) which was adopted as the gold standard mosquito repellent in the United States . DEET is effective against bites of most disease-transmitting vectors offering up to 99.9% personal protection for the long residual period. Although the mechanisms of action of DEET have been debatable for several years, initial studies hypothesised that DEET masks lactic acid on the human skin thus reducing attraction to biting mosquitoes . However, though controversy still exists, molecular and functional studies disputed this notion and showed that DEET selectively inhibits specific insect ORs by blocking electrophysiological signals of sensory neurones to attractive stimuli [109, 117, 118]. These findings were seconded by De Gennaro et al.  who showed that mosquitoes with non-functional OR complexes were only responsive to contact with DEET. Findings from Bohbot & Dickens  suggested that the structurally diverse repellent compounds including DEET, IR3535 (3-(N-acetyl-N-butyl) amino propionic acid ethyl ester), KBR 3023 or Picaridin (2-(2-hydroxyethyl)-1-methylpropylester) and MR08 (menthol propylene glycol carbonate) modulate the function of mosquito odorant receptors reducing vector-host contacts. Despite the excellent efficacy of DEET against mosquitoes, its use has been associated with various challenges. Its cost ineffectiveness and chronic human toxic effects  coupled with recent reports of resistance [121–123] compromise user reliability and human beings seem to have diverted preference to cheap, safe, eco-friendly and effective natural products of plant origin . A review by Maia & Moore highlighted some adverse side effects such as dermatitis sensation that resulted from the application of plant essential oils, thus in their view, plant-derived compounds may not be necessarily safer than synthetic insecticide DEET . However, the documented chronic side effects of DEET in children  surpass those implicated by plant derivatives.
Studies continue to report plants as potential sources of effective insecticides and interest on studies of plant-derived repellents renewed [86, 114, 124, 125]. For instance, pyrethroids used to impregnate LLINs were initially sourced from Chrysanthemum plant extracts (pyrethrum) in Kenya . With the close interactions of humans and nuisance mosquitoes that bay for blood, local communities in malaria endemic regions have devised cheap means of trying to drive these organisms out of their reach by using plants. In the African region, ethnobotanical knowledge has been immensely deployed to identify plants with repellent characteristics used by local communities to drive away mosquitoes from human dwellings as a preliminary source of mosquito control agents [127–131]. These surveillance studies show that bruising, burning or smouldering of the repellent plant parts, planting repellent plants around homesteads, and topical application of plant-derived oil formulations on the skin and garments are common local practices for keeping mosquitoes away from human hosts. A well-documented example was where Seyoum et al. reported that natives from western Kenya drove away An. gambiae (s.s.) mosquitoes from their huts via the direct burning of Lantana camara, Azadirachta indica, Lippia ukambensis, Tagetes minuta, and Ocimum americana . It has been suggested that the smoke produced by burning these plants masks human kairomones and convention currents used by mosquitoes for host seeking . Also, the smoke lowers relative humidity making mosquitoes vulnerable to desiccation and reducing sensory input as mosquito receptors respond well in the presence of moisture . Though this may appear primitive, this local method of reducing vector-human contacts forms the basis of today’s formulations against nuisance mosquitoes, and thus ethnobotanical knowledge has played a significant role in the search of natural products with repellent properties . Plant-derived compounds applied on human host skin surface, or space spraying interferes with mosquito host-seeking and blood feeding process . Given the fact that mosquitoes detect and respond to host volatiles, it is conceivable that reduction of the relative abundance of each chemical cue detected using repellents during sampling process would significantly minimise overall attraction.
In fact, the US Centers for Disease Control and Prevention (CDC) recommends the use of repellents against mosquito-borne diseases for travellers and military [135, 136]. For instance, potent plant-derived repellents such as p-methane-3,8-diol (PMD) (from Eucalyptus spp.) and citronella oil (from Cymbopogon spp.) are fully registered and recommended for topical use because of their protection efficacy of over 95% against mosquitoes [137, 138]. This report is supported by field studies, conducted in Ghana, where subjects wearing PMD- and citronella-treated garments were significantly protected from mosquito bites . Furthermore, topical application of PMD repellent on forearms by subjects in South Africa offered long-term 90–100% (for 5–6 h) protection against An. arabiensis mosquito bites which were equally effective as the commercial standard, DEET .
A summary of some repellent plant derivatives against anopheline mosquitoes
Major repellent compounds
Mode of testing
Perillyl alcohol, perillaldehyde, geraniol
Linalool, camphor, 4-isopropylbenzenemethanol, carvone, caryophyllene oxide
RC50 9.21 × 10-5 mg cm-2
Terpene-4-ol, fenchone, γ-terpinene, terpinolene
RC50 1.52 × 10-5 mg cm-2
Eugenol, terpinolene, β-myrcene
RC50 0.67 × 10-5 mg cm-2
Fenchone, camphor,α-pinene, β-myrcene
RC50 1 × 10-5 mg cm-2
Carvacrol, caryophyllene oxide, terpene-4-ol, β-myrcene, γ-terpinene, α-terpinene
RC50 1.93 × 10-5 mg cm-2
Linalool, caryophyllene oxide,γ-terpinene, 1-methylpyrrole
RC50 3.74 × 10-5 mg cm-2
RC50 0.081-0.091 mg cm-2
α-terpinene, thymol, linalool, geraniol, carvacrol, p-cymene
> 80% protection
p-menthane-3,8-diol, citronella, citronellol, geraniol, limonene, isopulegol, δ-pinene
Camphor, 1,8-cineole, p-cymene,aterpenene, fenchone, isocaryophyllene
Camphene, α-pinene, α-fenchyl alcohol, 1,8-cineole, α-terpeneol, p-cymene
Fenchone, limonene, 1,8-cineole
Myrcene, linalool, α-pinene, eucalyptol, camphor, camphene, 1,8-cineole
Allopurinol, camphor, limonene, verbenone, α-terpeneol, limonene oxide, cis-verbenol, linanool, α-terpeneol
Ocimene, dihydrotagetone, tagetones, ocimenones, piperitenone, 3,9-epoxy-p-metha-1,8(10)diene, β-caryophyllene, bicyclogermacrene, AR-turmerone
> 80% protection
Laboratory and semi-field studies
Mechanisms of action of plant-derived insect repellents
Until today, the modes of action of most plant-derived repellent compounds are still unclear although neurotoxic effects involving gamma aminobutyric acid (GABA), octopamine synapses, inhibition of acetyl cholinesterases and regulation of ion channels have been characterised . Binding of thymol to GABA receptors blocks the GABA-gated chloride channels on postsynaptic neurone membranes resulting in CNS hyper-excitations, convulsions and death . Eugenol activates octopaminergic receptors reducing production levels of cyclic AMP (cAMP) . Also, eugenol has been reported to increase the intracellular levels of calcium ions, thus inducing toxicity by mimicking the action of octopamine . Other essential oil constituents inhibit acetyl cholinesterase (AchE) resulting in ataxia, either by irreversible inhibitory effect or reversible competition for the enzyme’s active site . Geraniol and linalool reversibly compete with hydrophobic functional groups of AchE’s active site. Also, linalool was shown to inhibit neuronal electrical activity by inducing a reduction in amplitude of action potential and subsequent decrease in post hyperpolarization phase and firing frequency of action potentials . Using Drosophila, Kwon et al.,  demonstrated that citronellal interacts with transient receptor potential channel (TRPA1) modulating the Ca2+-dependent activation of potassium channel, but in An. gambiae TRPA1 is directly activated by citronellal. Loss of Ca2+-activated K+ channel resulted in impaired citranellal-elicited avoidance and increased the frequency of action potential in olfactory receptor neurones. In another study, plant essential oils from Verbenaceae, Lamiaceae, Asteraceae and Rivularaceae families were reported to inhibit mosquito odorant degrading enzymes of cytochrome P450 family on a metabolic standpoint . Taken together, these compounds disrupt various insect cellular activities and biological processes conferring repellent or toxicity effect. The repellent efficacy of plant essential oils varies significantly according to the phytochemical profile of the plant extract and the target insect. On the other hand, toxicity is influenced by the chemical composition of the essential oil, which depends on the source, season and ecological settings, extraction method, time of extraction and plant part used for extraction .
Other plant compounds elicit oviposition deterrence effects to gravid female mosquitoes by rendering the site unfavourable for egg laying. For instance, dual choice experiments performed using essential oils of Ocimum kilimandscharicum, and Ocimum suave deterred gravid An. gambiae (s.s.) mosquitoes from laying eggs as shown by reduced egg count about controls . (E)-caryophyllene and α-humulene from the essential oil of Commiphora leptophloeos have shown oviposition deterrence to Aedes mosquitoes, suggesting their potential to deter anopheline mosquitoes as well .
Attract and kill phenomenon using attractive toxic sugar baits
Mosquitoes supplement nutritional requirements by foraging nectar sources to provide energy for flight, longevity and enhance fecundity [153, 154]. Hien et al.  showed that plant sugar sources differentially influence infection prevalence and intensity, and hence natural sugar sources present a great threat to control of malaria by enhancing the survival and fecundity of mosquito vectors as well as development of P. falciparum [156, 157]. This finding is supported by Nyasembe et al. who demonstrated that infection with P. falciparum stimulates urge of nectar sugar uptake by female mosquitoes . Indeed, studies utilising behavioural response assays performed in dual-response olfactometer and coupled gas chromatography electroantennogram detectors (GC-EADs) have shown that anopheline mosquitoes discriminatively prefer certain plant odours for foraging , providing a basis for developing mosquito odor-baited traps using plant-based lures . Extensive behavioural and chemical ecology studies have recently come up with attractive toxic sugar bait (ATSB) method that kills mosquitoes questing for essential sugar sources, oviposition sites and bloodmeal . This technique was first developed by Israel-based researchers  and has been currently adopted by various research groups working in Africa, Florida (USA) and Israel  for trapping mosquitoes. Most formulations of ATSB involve the use of fruit juices from guavas and mangoes as phytochemical lures, sugar solution as feeding stimulant, and an oral toxin of 1% boric acid that kills mosquitoes upon ingestion [106, 160]. The technique has been successfully deployed for mass trapping of mosquitoes during vector surveillance operations, and for studies aimed at reducing the proportion of endophagic female mosquitoes . Although this new technique is still in the early stages of development, upscaling of its potential to cover large field applications would prove it a powerful malaria vector management tool that complements the existing vector control strategies. For instance, in a field assessment study conducted in Mali, ATSB significantly reduced indoor feeding mosquito populations by 90% suggesting its great potential to control malaria vectors . Additionally, spraying of ATSB on plants was found to reduce the relative abundance of female and male anopheline mosquitoes (by about 90%) with a concomitant reduction in the completion of the gonotrophic cycle . Irrespective of the availability of high-favoured sugar-rich sources, Beier et al. demonstrated that ATSB methods reduced the densities of female anopheline mosquitoes in arid oases during a 47-day field trial study . In summary, these testimonial reports demonstrate the efficacious impact of ATSBs in reducing the prevalence of malaria-transmitting mosquito populations as well as reducing their reproduction cycles.
Larvicidal agents derived from plants
Mosquitoes spend a considerable amount of time in the water during the development of juvenile stages. Therefore, vector control interventions targeting the larval habitats could considerably suppress the populations of adult mosquitoes consequently contributing to reduced vectorial capacity and parasite transmission . According to WHO , larviciding complements the existing vector controls in regions where the sites are “few, fixed and findable” such as urban and rural settings, potentially protecting several households within a small radius. As a component of IVM and larval source management (LSM), the approach reduces the proportion of both indoor and outdoor feeding mosquitoes, hence lowering residual malaria transmission rates [81, 167, 168]. Historically, it is one of the reported successful strategies of mosquito control , but its operational implementation in the prevention of malaria in sub-Saharan Africa is limited possibly due to its labour intensiveness, robust technical difficulties, the variability of vector site preferences and demand for frequent applications . Despite these constraints, community-based participatory small scale field trial programmes using formulations of microbial larvicides, Bacillus thuringensis var. israelensis (Bti) and Bacillus sphaericus (Bs), in African countries such as Gambia, Kenya, Tanzania, Burkina Faso, Côte d’Ivoire, and Benin have shown revitalizing efforts to revive larviciding for malaria vector control [170–177]. Unfortunately, apart from the high cost of these larvicides, the emergence of resistance through larval midgut modifications pose a challenge to their sustainability , a scenario that imperatively calls for cost-effective and resistance-resilient chemistries.
A summary of some larvicidal compounds derived from plants
Dosage at LC50
Mode of action
An. gambiae (s.s.)
An. gambiae (s.s.)
An. gambiae (s.s.)
Azadirachtin, salanin, deacetylgedunin
Toxicity and growth disruption
Mzikonone, 1α-12α- diacetoxy-1,2-dihydro-7-deacetyl-3β-7α-dihydroxyazadiron, 12-α-acetoxy-7-deacetylazadiron
An. gambiae (s.s.)
Mzikonone, 1α-12α- diacetoxy-1,2-dihydro-7-deacetyl-3β-7α-dihydroxyazadiron, 12-α-acetoxy-7-deacetylazadiron
An. gambiae (s.s.)
Toxicity and growth disruption
Toxicity and growth disruption
Stigmasterol, 20-hydroxyecdysone, γ-sitosterol
An. gambiae (s.s)
Toxicity and growth disruption
Stigmasterol, 20-hydroxyecdysone, γ-sitosterol
An. gambiae (s.s.)
Toxicity and growth disruption
Camellia sinensis (tea)
An. gambiae (s.s.), An. arabiensis
Toxicity and growth disruption
An. gambiae (s.s.)
An. gambiae (s.s.)
An. gambiae (s.s.), An. arabiensis
An. gambiae (s.s.)
Tannins, phenol, saponin, alkaloid, steroid, flavonoids, triterpenoid
49.51 × 10−3 mg/ml
An. gambiae (s.s.)
An. gambiae (s.s.)
Plant-derived insect growth regulators as potential agents for vector control
Mechanism of action of plant-derived insect growth regulators
The phytoecdysteroids structurally resemble plant growth steroids (brassinosteroids), but they defend the plants against phytophagous insect attacks . On ingestion, these compounds produce detrimental effects on insect development causing the insect to die as a result of moulting failure . Structural resemblance of these compounds to endogenous insect developmental hormone 20-hydroxyecdysone (20-E) is believed to interfere with moulting process through competition for the same endogenous hormone receptors arresting larval development at larval-pupal intermediates and consequently death [188, 192]. Although the distinct mode of action of phytoecdysteroids and limonoids is ambiguous, these compounds are speculated to either antagonise or agonise insect ecdysteroid and juvenile hormone receptors leading to disruption of endocrine balance [182, 192]. In addition to interfering with the hormonal balance, neem derivatives target cholinergic nerve transmission, hence disrupting neuromuscular coordination . Further, Azadirachtin has been reported to exhibit anti-mitotic effect by disrupting tubulin polymerization  and cell cycle arrest by down-regulating cyclin B and D1, in addition to inducing pro-apoptotic signals . On exposure to these compounds, some juveniles exhibit demelanized cuticle, absence or reduced chitin content, extended larval phase, elongated abdominal region, abnormal behaviour changes (tonic immobility) and adults with deformed flight muscles that fail to thrive suggesting dysregulation of neuroendocrine system [195–197]. Besides causing growth regulatory defects, exposure to mosquitoes to these compounds at sublethal doses negatively impact fecundity, reproductive fitness and egg viability - suggesting the potential of these compounds in insect control .
Use of plant-derived essential oils in larval control
Manipulation of larval habitats with biodegradable plant-derived essential oils has replaced the use of kerosene for mosquito control . These complex blends form a thin emulsion layer over the surface of mosquito breeding water, hence preventing oxygen entry, reducing amounts of water-dissolved oxygen, and induces larval intoxication upon ingestion. Existing reports indicate that essential oils evoke larval toxicity and are potent against An. gambiae (s.s.), An. arabiensis and An. stephensi  (Table 2). Findings by Kweka et al. showed that δ-3-carene from Schinus terebinthifolia essential oil was responsible for larval mortality rates of 13.75–97.91% in An. gambiae (s.s.) . Thymol and carvacrol from Plecranthus amboinicus produced lethality at LC50 55.20 ppm and LC90 99.09 ppm against An. gambiae (s.s.) within 24 h of exposure . Babatunde et al. reported that Ocimum canum essential oil reduced survivorship of An. gambiae (s.s.) larvae at LC50 49.51 × 10−3 mg/ml and LC90 103 × 10-3 mg/ml . It has also been reported that essential oils of Plectaranthus glangulosus and Callestemon rigidus were active against An. gambiae (s.s.) at LC50 7.37 ppm and 99.61 ppm respectively . In addition, laboratory- and field-based studies performed using An. gambiae (s.s.) demonstrated that trans-cinnamaldehyde from Cinnamomum osmophloeum and kau-16-rene, β-elemol from Cryptomeria japonica leaf essential oils caused larval toxicity at LC50 11.91–63.63 μg/ml and LC50 5.55–134.84 μg/ml, respectively [199, 204]. Moreover, monoterpenes from Zanthoxylum armatum essential oil evoked lethality to An. stephensi at LC50 58 ppm , while thymol from Trychyspermum ammi caused larval mortality at LC50 80 mg/ml . Neem oil formulation killed late larval instars of An. gambiae (s.s.) at LC50 11 ppm and inhibited adult emergence at IC50 6 ppm .
It is important to note that the efficacy of different plant compounds depends on various parameters such as; extraction method, geographical location of the plant, plant part used, concentration, test mosquito species, solvents used, the photosensitivity of some phytochemicals and time of extraction .
Synergistic phenomena in malaria control
Incorporation of plant-based compounds to potentiate the effects of the existing vector control methods has been studied, and findings from these studies indicate the synergistic potential of botanical derivatives in reducing risks of malaria transmission. For instance, in a randomized trial study carried out in the Bolivian Amazon, a reduction of 80% in malaria episodes was reported among participants who used plant-based repellent (PMD) and slept under LLINs, thus indicating a synergistic potential of PMD to LLINs relative to placebo group which slept under LLINs only without using the repellent . Additionally, in a community-based clustered randomised trial, Deressa et al. reported that the combined use of LLINs and mosquito repellent (Buzz-Off® petroleum jelly, essential oil blend) significantly reduced malaria infection by 34–47% relative to the control groups which received LLINs alone . Kweka et al. showed that individual compounds and their blends of plant-derived menthol propylene glycol carbonate (MR08) and DEET offered a protective efficacy in the range of 92–100%, suggesting that these blends could be of additional value for personal protection in the absence of IRS and LLINs . Elsewhere, Stewart et al. found out that indoor application of ATSBs in combination with LLINs could be a promising strategy to control pyrethroid-resistant mosquitoes .
Regulatory issues, advancements and commercialization of plant-derived mosquito control compounds
The demand for relatively safe and effective plant-based mosquito control agents by consumers continues to increase relative to synthetic counterparts . However, despite the extensive research on the insecticidal potential of plant-based compounds, only a few have been successfully registered and approved for commercialization . Strict regulatory laws imposed on the marketing of these compounds in many developed countries have slowed down the full exploitation of many established effective plant-derived chemistries to control nuisance insects. The concerns on potential risks associated with plant-derived compounds to environment, humans and non-target organisms are variable and majority lack of experimental basis . In spite of these issues, EcoSMART Technologies Inc. (Atlanta, USA) has succeeded in introducing plant-based insecticidal compounds for agricultural and consumer utilisation . In developing countries rich in biodiversity, many promising plant-derived compounds remain untapped for control of harmful insects, although in some cases, whole plant parts or crude extracts have been reported to protect humans from mosquito bites effectively . Concerns raised on the variability of product chemistries during pre- and post-harvest processing, that may affect the activity of the end product, are subject to debate [87, 95]. Some compounds are effective when in a cocktail of other plant components, whereas others require being isolated and purified. Nevertheless, whether to use crude extracts, for instance, essential oil to drive away mosquitoes or a formulation of the major chemical components is subject to user preference . Stability of the isolated compounds under different environmental conditions must be considered because some compounds may change the chemical conformation of functional groups upon storage due to photosensitivity and other environmental factors . For instance, neem derivatives and pyrethrum compounds are highly sensitive to UV exposure leading to degradation that in turn reduces their efficacy .
Residual efficacy of plant-based repellents and ATSBs is also under consideration. While many repellent compounds offer high protection efficacy similar to DEET against malaria mosquito vectors, volatility minimises their longevity to mediate protection . Advancements in technologies such as encapsulation and microencapsulations, nanoemulsions and fixatives have been pursued to improve the longevity of potent repellent compounds [86, 212]. For instance, slow-release encapsulated citronella oil nanoemulsion has been used to increase the efficacy of citronella-treated fabrics for up to 30 days . The shelf life and efficacy of neem-based products have been enhanced through microencapsulation, microemulsions, inclusion complexes and granular formulations [214, 215]. Membrane-based ATSBs enhance the release of bio-lures and increasing their efficiency in field applications (unpublished information from Günter Müller, Hebrew University, Jerusalem, Israel). Although enhancement of longevity would mean prolonged protection against mosquitoes, potential issues regarding environmental toxicity may arise. Environmental impact of many plant compounds is generally considered low owing to their biodegradability and short half-lives of < 30 h . Neem derivatives have fewer impacts on pollinators, natural pest predators and vertebrate species, despite its efficacy in controlling more than 300 insect species [216, 217]. In contrast to synthetic insecticides, many plant-derived compounds exhibit no persistence, bioaccumulation and biomagnification . Thus, it would be more advantageous when persistence is reduced to minimise negative implications. Widespread application of plant-based compounds especially mosquito repellents creates wary on the selectivity of these compounds to target invertebrates . Though generally regarded safe, it is yet to be established if some of these repellents could have negative impacts on non-target arthropods.
Other drawbacks to the commercialization of plant-derived mosquito control agents involve sustainability of the botanical resource, industrial confidence in the products, up-scaling potential of plant resource products, standardisation of chemically complex extracts, slow action of other compounds and availability of competing products such as newer synthetics, fermentation and microbial products.
As the world’s human population continues to increase (world’s population growth rate currently approximated at 1.24% annually ), more land is needed to sustain developments, agriculture and settlements. These anthropogenic activities contribute to opening up of potential mosquito breeding sites and even speciation of malaria vectors [172, 219]. Also, the overwhelming development of vector resistance to the currently available synthetic insecticides, following persistent application, continues to challenge the effective control towards malaria transmission [8, 220]. It is therefore anticipated that the identification of bioactive plant compounds will continue for improved management of malaria-transmitting mosquito vectors. A handful of biologically active compounds identified from plants is yet to be exploited for controlling insect pests and vectors on a large scale. Therefore, ‘bench to field’ transition of laboratory tested bioactive compounds and subsequent incorporation into IVM could offset insecticide resistance, undoubtedly reducing malaria vector populations and risk of malaria transmission by greater magnitudes. Successful interventions to control malaria-transmitting mosquitoes using plant-derived compounds would require available, scalable and sustainable technologies for both local and large-scale manufacture. Nanotechnology is currently revolutionising the production of market pesticides. Production of plant-derived nanoparticles and nanoencapsulation compounds increases the longevity of essential oils through slow-release phenomenon conferring prolonged protection against mosquito bites . Furthermore, the silver nanoparticle larvicidal agents derived from plant extracts will find useful applications in larviciding . Advances in applied nanobiotechnology have revolutionised synthesis of plant-based silver nanoparticles that are currently being reported effective against even insecticide resistant disease-transmitting vectors, primarily targeting the immature stages at low dosages of 1–30 ppm . The membrane-based ‘attract and kill’ systems will also in future be revolutionising field-based applications of bio-lure compounds for mass trapping of mosquitoes (unpublished information from Günter Müller, Hebrew University, Jerusalem, Israel). It is therefore anticipated that more robust technologies for controlling malaria vectors using bio-products are underway. Plant-derived compounds could potentially be used for controlling mosquito vectors by manipulating their behaviour and possibly replace pyrethroids in impregnating bed nets as suggested by Deletre et al. .
Comprehensive understanding of the mechanistic role of mosquito olfaction, odour coding and larval ecology is crucial for developing new strategies for disrupting malaria transmission cycle. Integrated vector management programmes advocate for strategies that aim at improving the cost-effectiveness, efficacy, ecological soundness and sustainability of control interventions. In nature, economically feasible plant bioactive compounds are in abundance, many of which are unexploited for vector control. We state that the tools and compounds presented in this review, despite showing promising efficacy against outdoor mosquito populations under laboratory and small field trials, effectiveness under large-scale field trials and various epidemiological settings remain unexplored. The blends of secondary metabolites extracted from plants cannot be used alone, hence will require being integrated with the existing vector control methods so as to provide synergistic tools that can sustainably help to reduce and possibly eliminate malaria vector populations.
Attractive toxic sugar bait
Entomological inoculation rates
Gamma aminobutyric acid
Indoor residual spraying
Integrated vector management
Long-lasting insecticide treated nets
World Health Organization
We acknowledge the contributions of Sheila Ogoma and Luicer Ingasia towards this review.
Availability of data and materials
The datasets supporting the conclusion of this article are included within the article.
JMM, JLB reviewed the literature and formulated the review. JMM wrote the paper with assistance from JLB, SNN, JOO, and SSI. All authors read and approved the final manuscript.
The authors declare that they have no competing interests.
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