Susceptibility to common insecticides and detoxifying enzyme activities in Anopheles sundaicus (sensu lato) after cessation of indoor residual spraying of insecticides in the Jaffna Peninsula and its surroundings in northern Sri Lanka

Table 1 Mortality in An. sundaicus (s.l.) exposed to three insecticides

Insecticide	Mean % mortality ± SD (no. of mosquitoes tested)		t-value	P-value
Insecticide	Kilinochchi	Jaffna
Deltamethrin (0.05%)	^S100 (110)	^V97.3 ± 3.8 (100)	t₍₈₎=-3.0	0.09
Malathion (5%)	^S100 (136)	^V96. 4 ± 0.7 (105)	t₍₁₀₎= -2.0	0.18
DDT (4%)	^R30.9 ± 8.7 (151)	^V91.2 ±0.3 (100)	t₍₈₎= 31.3	0.01

Abbreviations: S susceptible (≥ 98% mortality), R confirmed resistance (< 90% mortality), V possible resistance and verification needed (90–97% mortality) [22], SD standard deviation

ISSN: 1756-3305