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稻苞虫是水稻上的大害虫,俗名结苞虫、青虫,属鳞翅目、弄蝶科。水稻孕穗期被害后,稻穗比健穗短小5—50%,每穗谷粒减少40—50%,千粒重减轻15—20%,秕粒增加,严重时稻叶被吃光,不能抽穗。据试验每丛稻平均有1头幼虫,可使稻谷减少16%;有幼虫2头时,损失稻谷24%;3头时损失稻谷37%;如果每亩有幼虫7—10万头,可使稻谷减产50%,甚至颗粒无收。我省发生的稻苞虫大约有五种:即直纹稻苞虫、曲纹稻苞虫、么纹稻苞虫、隐纹稻苞虫和小黄斑稻苞虫,以直纹稻苞虫发生为主,约占总发生量的90%,分布于全省稻区;其次为隐纹稻苞虫,另三种发生量更少。本文就直纹稻苞虫的发生规律及防治问题作一简述。
Rice insects is a large pest on rice, the common name of insects, caterpillars, is a Lepidoptera, butterflies Branch. After the booting stage of rice, the ear of rice is 5-50% shorter than the ear of ear, 40-50% of the grain per ear, 15-20% of the weight of the grain, 15% of the grains increase, and the rice leaves are eaten in severe cases and can not be heading. According to the test, there is an average of one larva per bundle of rice, which can reduce the rice by 16%; when there are two larvae, the loss of rice is 24%; the first one loses 37% of the rice; 50% reduction in paddy, or even crop failure. There are about 5 kinds of rice shell insects occurred in our province: namely, rachis mycelia, trapezoid rice worms, moths rice insects, pests and small yellow-spotted insects, , Accounting for about 90% of the total occurrence, distributed in the rice province; followed by the hidden pests of rice, the other three occurred less. This article gives a brief account of the occurrence and control of rice stem borer.