벼멸구에 대한 Fenoburcarb(36, 12 ppm)와 Imidacloprid(0.7, 0.4 ppm)의 벼유묘 뿌리 침지 시간(1, 4, 8, 12, 16, 20, 24시간)에 따른 살충활성과 섭식행동의 상관관계를 조사하였다. EPG (electrical penetration graph)의 파형은 신호개시 후 4시간 동안 기록하여 분석하였다. 침투이행성과 살충력과의 상관관계는, 두 약제 모두 농도가 높을수록 높은 보정살충율을 보였고, 침지시간이 길수록 살충활성이 높았다. 파형에 있어서는 두 약제 모두 농도가 높아질수록 상대적으로 non-probe time은 길어졌고 체관을 찌르는 시간은 짧아졌다. 침지시간이 길어질때에도 같은 경향을 보였다. 따라서 침지시간에 따른 살충활성과 두 파형간에 상관관계가 있는 것으로 나타났다.
Two insecticides, fenobucarb (36, 12 ppm) and imidacloprid (0.7, 0.4 ppm) were treated on rice seedling roots by root uptake method with different dipping time (1, 4, 8, 12, 16, 20, 24 hrs). This study was performed to elucidate the correlation between insecticidal activity and feeding behavior of Nilaparvata lugens using EPG (electrical penetration graph). EPG waveforms are recorded for 4 hours and classified into six waveforms. In the correlation between root uptake and corrected mortality, both insecticides showed higher corrected mortality as higher doses and as longer root uptake times. In the analysis of waveforms, N. lugens showed longer nonprobe time but shorter phloem feeding time at a higher dose. It was also showed the same result as longer the root uptake times. Therefore, it showed the correlation between insecticidal activity by root uptake time and both EPG waveforms (non-probing time and phloem feeding time).
