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稻飞虱(Nilaparvata lugens Stal)在福建省一年可发生6～7代.准确掌握成虫、成虫若虫在田间的分布及数量是防治的关键。1986年我们在福州郊区对褐飞虱的空间分布型进行了田间调查,并对几种常用的随机抽样方法和抽样数量进行了比较分析。一、材料与方法(一)在晚稻孕穗期(褐飞虱5～6代),分别调查5块同一品种、长势一致的水稻田。在每块田中央分别调查1080、1120、1008、1080、1008丛。逐一检查每丛成虫数、若虫数。将所得数据以成虫、成若虫形式绘出田间分布图。在分布图上列出不同虫态的频次分布、统计出平均数X及方差S~2。
Nilaparvata lugens Stal can occur from 6 to 7 generations a year in Fujian Province. Accurately understanding the distribution and quantity of adults and nymphs in the field is the key to prevention and control. In 1986, we conducted a field survey on the spatial distribution of BPH in the suburbs of Fuzhou, and compared several commonly used random sampling methods and sampling numbers. First, materials and methods (a) in the late rice booting (brown planthopper generation 5 to 6), were investigated five identical varieties, consistent rice fields. In each field central survey 1080,1120,1008,1080,1008 plexus. One by one check the number of adults per bundle, number of nymphs. The data obtained as adults, into the form of nymphs plot field distribution. The frequency distributions of different insect states are listed on the distribution chart, and the mean X and the variance S ~ 2 are calculated.