Efficacy of Lambda-Cyhalothrin Insecticide on the Larval Stages of Green Lacewing (<i>Chrysoperla carnea</i>, Step.) under the Laboratory Conditions

Green lacewing (Chrysoperla carnea) is a generalist and voracious predator that consumes wide range of insect pests such as aphids, mites, coccids and mealy bugs in the biological control of Integrated Pest Management (IPM). The experiment was carried out to observe the effect of different concentrations 25, 50 and 75 ppm of Lambda-cyhalothrin on 1st, 2nd and 3rd larval instars of Chrysoperla carnea in 2019. The minimum mortality of 1st larval instar was seen 25 % after 48 hrs by 25 ppm while the maximum 100 % mortality was brought by 75 ppm. The effect of these concentrations on 2nd larval instar revealed that the minimum death 25 % was seen after 24 hrs. at 25 ppm and the maximum mortality 100 % brought by 75 ppm during 1st week. The effect against 3rd larval instar at the highest dose (75 ppm), the absolute mortality was observed after 72 hrs. In control, up to 25 % mortaliy was recorded after 72 hrs. in all larval stages, respectively. The dose (10 ppm) was less toxic against the 1st, 2nd and 3rd larval stages of C. carnea. It shows the values of LC50 2.18, 1.90 and 1.44 ppm C. carnea−1 with its fiducial limit ranges. Similarly, at the highest dose (75 ppm), the value of LC50 was 1.91, 1.66 and 1.16 C. carnea−1 with its fiducial limit ranges against 1st, 2nd and 3rd larval instars, respectively. The values of LC50 were showed 1.83, 1.44 and 1.39 ppm C. carnea−1 with its fiducial limit ranges at the moderate dose (50 ppm) against different larval stages. In control (0 ppm), the LC50 was 2.63 ppm C. carnea−1 with its fiducial limit ranges in all larval instars. There were seen significant mortality against 1st, 2nd and 3rd larval instars of green lacewing (P < 0.005) between the treatments and intervals, respectively.