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田间调查是一种评估害虫及天敌种群数量的科学方法。田间调查的方法很多,为比较不同调查方法之间的准确性差异,笔者曾用目测法、水盆法、粘板法、吸虫法对水稻害虫及天敌作过调查,现将结果整理如下:材料与方法调查田面积约0.5亩,品种为 IR—72,水稻正处于幼穗分化始期。调查时,将调查田分成4个小区,每个小区用下列4种方法之一调查20丛稻上的害虫及天敌数量。这4种调查方法是:1.目测法:即用眼睛直接计数水稻上的害虫及天敌数量。为使害虫及天敌不因人为
Field surveys are a scientific method of assessing the population of pests and their natural enemies. There are many methods of field investigation. To compare the difference of accuracy between different survey methods, the author investigated the pests and natural enemies of rice by visual inspection, basin method, stick-stick method and fluke method. The results are summarized as follows: Material Field survey with methods of about 0.5 acres, the variety IR-72, rice is in the beginning of panicle differentiation. During the investigation, the investigation field was divided into 4 plots, each of which investigated the number of pests and natural enemies on 20 rice varieties by one of the following four methods. These four methods of investigation are: 1. Visual method: that is, the direct counting of the number of pests and natural enemies on rice. To make pests and natural enemies not artificial