Abstract
The green lacewing Chrysoperla carnea (Stephens) (Chrysopidae; Neuroptera) is a generalist biological agent
commonly used to control insect pests. Toxic effects of five commercial insecticides viz., carbosulfan, leufenuron,
cyfluthrin, methomyl and fenpropathrin were evaluated on green lacewing through laboratory bioassays. At 27 ±
2°C, 65 ±10% RH and 14-h photophase. Insect mortality was determined following insecticide exposure by eggs
immersion, larval leaf dip bioassay and by direct adult topical application. Larval mortality was observed for the
instar treated and for following instars and pupae. Following insecticide exposure, C. carnea mortality was
greatest for life stages treated directly and decreased during subsequent life stages. Methomyl, cyfluthrin and
fenpropathrin caused about 95% mortality when 1st instar was exposed to chemicals. Methomyl and fenpropathrin
remained effective and caused 92% mortality when 2nd instar was exposed to chemicals. All chemicals caused
about 60-70% mortality, when applied to 3rd instar. Mortality of adults was highest 57% for fenpropathrin. All
materials had greatest effect on longevity and fecundity of adults.
