1 Environmental Agricultural Research Division, Gyeonggi Agricultural Research and Extension Services, Hwasung 445-784, South Korea
2 Institute for Bioresources research, Osangkinsect Co., Ltd. South Korea
Scale insect pests, especially P. comstocki, are major pests of pear orchards in South Korea. The green lacewing, Chrysoperla nipponensis is one of the native natural predators being widely distributed in South Korea. We investigate the predation ability of C. nipponensis against the several insect pests in the laboratory, and the control effect of C. nipponensis against the P. comstocki on pears under orchard conditions from 2011 to 2013. Chrysoperla nipponensis goes through complete metamorphosis and the developmental time of larva takes 25.6 days (20±1°C, 60~70%, 16L:8D). These larva are particularly effective at controlling scale insects and can consume 440.2 P. comstocki nymphs in their larval stages. Chrysoperla nipponensis showed about 80% control of P. comstocki in pear orchards, when 90 larvae of C. nipponensis had been added to each pear tree over three times at 10 days intervals from the early May to the early July. Controlling the scale insect can lead to increases of yields and quality of pears.