This study was performed to investigate the correlation between changes of feeding behavior of green peach aphid, Myzus persicae and residual effect of an insecticide, Pyrifluzuinazon, using EPG technique. Pyrifluquinazon was showed the insecticidal activity until three days (72h) after treatment, and the activity was high in nymph than adult of GPA. There was no difference among treatment methods. Lethal sign was observed the slimed the abdomen of GPA after 3 days that rises the insecticidal activity, and dieㅇ as being sticked and/or pulled out the needle. Residual efficacy from 1, 3, 5, 7 to 20 days after treatment, insecticidal activity was showed 70% in 50 ppm, recommended concentration, until 5 days. And waveforms relating to non-probe time and phloem phase time using EPA, feeding inhibition efficacy was showed during 5 days after treatment, but showed similar level with control after 13 days. These results show that the change of feeding behavior of GPA is correlated with the change of residual effect of pyrifluzuinazon.

• Shin, Dong-Gu(Central Institute of Kyungnong Co., Kyeongju, Kyungnong)
• In-Cheon Hwang(Central Institute of Kyungnong Co., Kyeongju, Kyungnong)
• Sun-Ran Cho(Dept. Plant Medicine, College of Agric. Life, Environ. Sci., Chungbuk National University)
• Jeong-Oh Yang(Dept. Plant Medicine, College of Agric. Life, Environ. Sci., Chungbuk National University)
• Sang-Rae Moon(Dept. Plant Medicine, College of Agric. Life, Environ. Sci., Chungbuk National University)
• Changmann Yoon(Dept. Plant Medicine, College of Agric. Life, Environ. Sci., Chungbuk National University)
• Gil-Hah Kim(Dept. Plant Medicine, College of Agric. Life, Environ. Sci., Chungbuk National University)