褐飞虱降落分布规律及主害代发生程度中期预测

Landing Patterns and Indexes for the Occurrence Prediction of the Peak Generation of Brown Planthopper in Guangdong Province

研究表明，在广东省中南部地区，由于局部地形和气象因素的影响，褐飞虱降落分布呈明显的规律性。沿海以海距约５ｋｍ范围内特别是江河入海处稻田稻飞虱较多；丘陵盆地背风处稻田明显多于迎风区和开阔地带；峡谷走廊的迎风廊口多于廊中。褐飞虱主害代低龄若虫高峰期前２０～２５ｄ，目测调查卵、若虫和成虫密度，应用数量指标，预测早、晚稻主害代发生程度，经检验。

Local landing patterns of brown planthopper (BPH) (Nilaparvata lugens Stal) was studied in Guangdong Province The BPH population density was higher in paddy fields where located along the coasts within 5 km far from the sea, and at the side of hills of the mountainous basins sheltered from winds, and the gate of canyon corridor facing windwards The indexes for occurrence degree prediction of the peak generation (G 3, G 7) of BPH in early or late rice fields were proposed by field sampling to inspect the number of egg and the sum of adults and nympha of 2nd or 6th generation of BPH 20 to 25 days ahead These indexes could be applied to predict the occurrence degree of BPH in the central and southern Guangdong Province