Insecticide resistance in malaria vector mosquitoes at four localities in Ghana, West Africa

Parasites & Vectors

Table 2 Results of exposure of wild Anopheles gambiae S form adults to insecticide treated papers using the WHO susceptibility test.

Locality	Insecticide class	Treated papers	Length of exposure	N	% Mortality 24 h post-exposure
Obuasi	Pyrethroids	0.05% Deltamethrin	1 hour	64	89.1
		0.05% Lambda-cyhalothrin		60	76.7
		0.15% Cyfluthrin		62	66.1
		0.75% Permethrin		65	38.5
	Carbamates	0.1% Bendiocarb	1 hour	61	93.4
		0.1% Propoxur		59	89.8
	Organophosphates	1.0% Fenitrothion	2 hours	60	96.7
	Organochlorines	4.0% DDT	1 hour	60	31.7
Tarkwa	Pyrethroids	0.05% Deltamethrin	1 hour	152	56.6
	Carbamates	0.1% Bendiocarb	1 hour	113	74.3
	Organophosphates	5.0% Malathion	1 hour	210	98.6
	Organochlorines	4.0% DDT	1 hour	39	5.4
		4.0% Dieldrin		14	0
Akyem	Pyrethroids	0.05% Deltamethrin	1 hour	173	75.1
	Carbamates	0.1% Bendiocarb	1 hour	56	37.5
	Organophosphates	5.0% Malathion	1 hour	51	98.0
	Organochlorines	4.0% DDT	1 hour	53	5.7
		4.0% Dieldrin		56	0
Ahafo	Pyrethroids	0.05% Deltamethrin	1 hour	186	45.1
		0.05% Lambda-cyhalothrin		27	19.0
		0.75% Permethrin		41	15.0
	Carbamates	0.1% Bendiocarb	1 hour	178	77.6
	Organophosphates	5.0% Malathion	1 hour	171	95.4
		1.0% Fenitrothion	2 hours	29	93.1
	Organochlorines	4.0% DDT	1 hour	100	3.1
		4.0% Dieldrin		89	9.2

Each day's exposures were run with at least 20 control mosquitoes. All controls showed < 5% mortality negating the need for the use of Abbott's formula [6].

ISSN: 1756-3305