Multiple insecticide resistance mechanisms involving metabolic changes and insensitive target sites selected in anopheline vectors of malaria in Sri Lanka

Table 1 Percentage mortalities of Anopheles culicifacies and Anopheles subpictus populations to different insecticides (n > 100 for each value)

	Anuradhapura		Kurunegala		Moneragala		Puttalam		Trincomalee
	Ac	As	Ac	As	Ac	As	Ac	As	Ac	As
4% DDT	34	20	4	14	62	30	24	47	22	19
5% Malathion	39	39	100	49	47	27	30	23	30	30
1% Fenitrothion	88	60	100	62	60	40	100	48	78	40
0.1% Propoxur	100	92	100	84	100	93	100	85	100	86
0.1% λ-cyhalothrin	100	65	100	58	100	100	100	85	100	100
0.25% Permethrin	50	30	85	65	65	67	87	67	23	25
0.025% Deltamethrin	100	88	100	86	7	84	100	92	97	88
0.1% Cypermethrin	100	100	100	100	100	100	100	100	100	100
0.15% Cyfluthrin	100	100	100	100	100	100	100	100	100	100
0.1% Etofenprox	95	27	89	67	85	62	85	74	90	100

Ac = An. culicifacies
As = An. subpictus.
Mortality 98%–100% indicates susceptibility, 97%–80% suggests possibility of resistance that needs verification, < 80% indicate resistant [11].

ISSN: 1475-2875