Degradation of insecticides used for indoor spraying in malaria control and possible solutions

Table 2 FTIR recorded performance under accelerated ageing conditions

Insecticide class	Insecticide	Heat ageing¹	UV degradation²	Humidity³
Organochlorine	DDT	<50 h	<100 h	lost
Organophosphate	malathion	<50 h	<50 h	-
	fenitrothion	<50 h	<50 h	-
	pirimiphos-methyl	<50 h	<50 h	lost
Carbamates	bendiocarb	<50 h	<50 h	lost
	propoxur	<50 h	<50 h	lost
Pyrethroids	alphacypermethrin	>250 h	>250 h	present
	bifenthrin	<50 h	<150 h	present
	cyfluthrin	>250 h	<150 h	present
	deltamethrin	>250 h	<150 h	present
	lambdacyhalothrin	<150 h	<150 h	present
Other	etofenprox	<200 h	<150 h	present

¹ Oven ageing at 80°C in 50 h intervals; ²Dry cycle UV degradation in a QUV at 63°C and 0.67 W/m² in 50 h intervals; ³ 168 h Humidity ageing at 40°C and 90% ℜH