author(s)
B Mahankuda, HR Sawai, RW Gawande, PS Neharkar and VG Nagdeote

abstract
The present investigation was carried out in the biocontrol laboratory, entomology section, college of agriculture, Nagpur during 2016-2017 to study the residual toxicity of some insecticides viz. Chlorantraniliprole 18.5 SC, Diafenthiuron 50 WP, Cartap hydrochloride 50 SP, Spiromesifen 22.9 SC, Thiamethoxam 25 WG, Clothiandin 50 WDG, Flonicamid 50 WG, Azadirachtin 1500 ppm up to 10 days on the adult survival rate of Trichogramma chilonis through glass vial bioassay method. On the basis of IOBC categorization on persistency, insecticides were classified. All the treatments under present study showed relatively higher per cent of toxicity as compared to control. Amongst all the insecticides, cartap hydrochloride and thiamethoxam were found most harmful causing 100 per cent mortality among the adults during all the days under observation. Whereas, clothianidin and flonicamid were found slightly harmful to moderately harmful causing 45.77 and 37.77 per cent adult mortality respectively. However, Diafenthiuron and chlorantraniliprole were found slightly harmful to harmless to adults causing 18.22 and 16.88 per cent mortality respectively. Azadirachtin and spiromesifen were found most safe with an adult mortality rate of 6.22 and 8.93 per cent respectively. As per the IOBC classification on persistence, Azadirachtin and spiromesifen were classified as slightly persistent. Residual toxicity of both the insecticides lasted up to 10 days.