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粘虫(Mythimna separata walker)是我国十一大病虫之一,主要为害水稻、小麦、甘蔗、高梁、玉米等作物.稻田发生粘虫以穗期受害最大,尤其晚稻常遭剪穗为害而造成严重损失,有些地方早稻也遭剪穗为害.稻田粘虫调查取样和为害损失估计是进行粘虫测报和开展防治的必要工作,是掌握和分析虫情的重要手段.但由于各地调查方法不同,所得的数据难以比较,尤其在虫口密度较低的情况下,宜采取何种调查办法,才能作出简便准确的估计,这是值得研究的.本文仅就稻田穗期粘虫发生情况的调查取样方法及其剪穗为害掉谷损失的估计办法进行探讨.
Mythimna separata walker is one of the eleven major pests in China, and mainly infects crops such as rice, wheat, sugar cane, sorghum, corn, etc. Myzuschia myzicae suffer the most damage at heading stage, especially the late rice is often damaged by cutting ear Serious loss, and in some parts of the early rice is also cut ear damage.White fieldworm survey sampling and damage estimates of loss is to test the armyworm and carry out prevention and control of the necessary work is to master and analyze the worm an important means.However, due to different survey methods, The data obtained are difficult to compare, especially in the case of low density of insects, what investigation should be taken in order to make a simple and accurate estimate, it is worth to study.In this paper, paddy field only to investigate the incidence of armyworm sampling methods And the method of estimating the loss of the cut-off valley.