벼멸구의 식이행동을 전기적인 측정 방법을 통하여 관찰하였으며 이들을 각각의 특성에 따라 분류하였고, 그결과 type P, S, SB, O, X, Ph 등 6가지로 나누어 볼 수 있었다. Type P는 벼멸구가 식물에체 처음 접근하여 기주를 탐색할 때 볼 수 있었으며, 구침을 조직내에 찔어 넣거나조직내에서 이동할 때에는 type S를 관찰 할 수 있었다. 또한 매우 규칙적인 S패턴은 체관부에 구침을 찔어 넣을때만 볼 수 있어 type SB로 따로이 분류하였다. X와 Ph패턴은 각각 물관부와 채관부에서 흡즙할 때 나타나는 것을 확인하였으며, type O는 기타 다른 조직내에 구침이 있을 때 이러한 전기적 패턴을 보여 주었다. 이러한 각각의 전기적 패턴을 확인하기 위하여 원하는 패턴이 나타날 때에 식흔이 있는 벼의 조직을 잘라서 현미경으로 관찰하였으며, 각각의 타입별로 벼멸구 배설물을 측정하였다.

Feeding behavior fo female brown planthoppers, Nilaparvata lugens Stal, was examined with an electrical recording technique using DC amplifier and through anatomical observation of stylet ovement in the rice plat with electrical recordings. There was six feeding patterns, type P, S, SB, O, X and Ph with the brown planthopper. Type P was a probing pattern during searching the proper feeding site. Type S appeared to be associated with the initial penetration and changing direction through the tissues, and from this type type SB pattern could be distinguished by the regularity of the large potential drops seen, and might be associated with penetration of the phloem sheath and/or salivation in the phloem sheath. The type O pattern shows none of the large voltage drops which were believed to occur when cell walls were being broken down and passes through a relatively thin layer of cells into an air space. The very constant waveform of the type X pattern could be seen during ingestion within the xylem bundle sheath area. The Ph pattern always followed an SB pattern and was associated with a marked negative voltage drop. When this pattern was seen, the brown planthopper might be ingested plant sap from phloem sheath area.

• Young Nam Youn
• Young Duck Chang