Investigation on the Effects of lufenuron and pyridalyl Insecticides on the Developmental Stages of the Green Lacewing (Chrysoperla carnea Steph.) under Laboratory Conditions

In this study, lethal effects of two insecticides, lufenuron (Match® EC 5%) and pyridalyl (Sumi Pelo® EC 50%) were investigated on different developmental stages including egg, first and second instar larvae and pupa of the green lacewing, Chrysoperla carnea under laboratory conditions. Treatment of larvae with residual bioassay method was carried out in glass Petri dishes. The eggs and pupae were treated with immersion method in the toxic solution. Mortality of the larval stage after 72 h, the egg stage after the embryonic period (4 days) and pupal stage after 7 days was recorded. The treatments were carried out at 26 ± 1ºC, 60 ± 5 % RH and 16:8 h L:D. The results show that none of the insecticides were effective on the eggs up to the concentration of 5000 ppm. The insecticides, lufenuron and pyridalyl with the same concentration caused 16.66 and 8.33% mortality on the pupae respectively. There were no significant differences between the treatments and the control. Lufenuron caused significant mortality in the 1st instar larval after 72 h and the LC50 value determinred was 23.102 mg ai/l, this insecticide was less effective on the 3rd instar larvae. The results show that pyridalyl had no lethal effects on the 1st and the 3rd instar larvae.