Sublethal Effects of three insecticides on adults green lacewing Chrysoperla carnea Stephens with demographic toxicology method

In this research, adult lacewings were reared in the greenhouse on an artificial diet. The larvae were fed by the eggs of Mediterranean flour moth. Sub-lethal effects of endosulfan, imidacloprid and indoxacarb were assessed using demographic toxicology method on adult lacewings at concentrations of 317, 46 and 9 mg AI/lit (as LC25), respectively. Most of the biological parameters of the lacewing, except mean age of fecundity and gross hatch rate, were significantly affected by the insecticides. The gross fecundity rate in control, imidacloprid, endosulfan and indoxacarb-treated insects were 618, 492, 313 and 279 eggs per female; indicated that the parameter was reduced significantly by imidacloprid and endosulfan treatments compared to the control. The stable population parameters were affected by the treatments. The intrinsic rates of increase (rm) values were 0.179, 0.161, 0.157 and 0.136 female offspring per female per day in control, imidacloprid, endosulfan and indoxacarb-treated cohorts, respectively. In general, the sublethal toxicity ranking of the treatments was as follows: imidacloprid< endosulfan < indoxacarb. We concluded that the adult lacewing was sensitive to endosulfan and indoxacarb.