Relative toxicity of some insecticides against Chrysoperla zastrowi sillemi (Esben-Petersen) under laboratory conditions.

摘要

Comparative toxicities of eight newer and already recommended insecticides for the management of P. solenopsis were studied against immature stages of Chrysoperla zastrowi sillemi (Esben-Petersen) under laboratory conditions. Clothianidin, profenophos and acephate had shown extremely high ovicidal action as no egg hatching was observed. Imidacloprid with moderate ovicidal action showed 63.33 per cent egg hatching followed by chlorpyriphos (56.67%) and thiodicarb (46.67%). Buprofezin (73.33%) and endosulfan (70.00%) recorded significantly higher hatching of eggs. Clothianidin, profenophos, imidacloprid, chlorpyriphos, acephate and thiodicarb were found to be most toxic to the second instar larvae and adults of the predator. In case of adult emergence from treated pupae and their survival buprofezin again was found to be the safest insecticide with 76.67 per cent adult emergence and 70.00 per cent adult survival followed by endosulfan. However, the lowest adult emergence (53.33%) and survival (10.00%) was observed in case of clothianidin.