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我地早稻前期褐稻虱虫量甚低,特别是调查褐稻虱成虫初次迁入早稻秧田或本田时,用通常的网扫、笼罩及盆拍法调查,尽管化费了很大的人力,但往往还是得不到结果。为此去年我们试制了一只拖网,并用于调查,经两年耒的使用证明,效果颇佳。拖网调查可扩大取样面积,增加捕获机率。己被列入“1979年全国褐稻虱联合测报网工作方案”中的秧田调查的方法之一。现将拖网结构及调查方法介绍于下: 一、拖网结构网口高1.50尺,宽3.40尺(与一畦秧板的宽度相当),网口的上端比下端伸出0.7尺,以防在调查过程中成虫从上方逃逸。网口下端到尾部长2.0尺,尾部钉0.2尺宽的木板。先用小木条做好网架,再在上下左右各钉上一层尼龙纱(40目以上即可),如图。
In the early stage of early rice, the amount of brown planthopper was very low. In particular, when it was investigated that brown planthopper adults moved into early rice or field for the first time, they were surveyed using the usual net sweep, But often still no result. Last year we piloted a trawl and used it for surveys. After two years of use, it proved to be quite effective. Trawl surveys can expand the sampling area and increase the probability of capture. Has been included in the “1979 National Brown Planthopper Joint Survey Network Work Plan” in one of the methods of seedling investigation. Now trawl structure and survey methods are introduced below: First, the trawl net mouth 1.50 feet high, 3.40 feet wide (with a seedling width), the upper end of the mouth than the bottom 0.7 feet to prevent the investigation Adults escape from above. Ethernet port to the tail length of 2.0 feet, tail nail 0.2 feet wide wood. First with a small wooden grid, and then in the upper and lower left and right nails layer of nylon yarn (40 mesh above), as shown.