Effect of Persistent Toxicity of Different Plant Protection Products (Insecticides) on the Biotic Potential of Chrysoperla Carnea

The green lacewing Chrysoperla carnea (Stephens) (Chrysopidae; Neuroptera) is a generalist biological agent commonly used to control insect pests. Toxic effects of eight commercial insecticides were evaluated on green lacewing through laboratory bioassays and field experiments. Biological parameters viz., fecundity, fertility, larval period, pupal period and adult emergence were recorded. Under present investigation the effect of persistent toxicity (sub lethal residual toxicity) of different selected insecticides on various parameters taken in to account of biotic potential were found significant. All the tested insecticides influenced negatively to different parameters studies under biotic potential in comparison to untreated control. The minimum impacts on various parameters were observed by NSKE and nimbecidine. Further, demonstrate that the effect of persistent toxicity on biotic potential parameter of different tested insecticides were maximum on one day after treatment and minimum on five days after treatment