Effect of different insecticides on parasitization potential of Trichogramma chilonis under laboratory condition

Abstract

The present investigation was undertaken in the Biocontrol laboratory, Entomology section, College of agriculture, Nagpur during 2016-2017 to study the safety 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 towards parasitization potential of Trichogramma chilonis on both UV irradiated and unirradiated eggs of Corcyra cphalonica. Amongst all the insecticides under present study, chlorantaniliprole, diafenthiuron and thiomethoxam were found harmless towards parasitization and could be used safely before release of T chilonis in the field. Whereas, clothianidin, flonicamid and azadirachtin were found slightly harmful and affected the parasitisation rate of Corcyra eggs by T chilonis. However, Cartap hydrochloride and spiromesifen recorded highest reduction in parasitisation and should not be used in field prior to release of the parasitoid.