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螟虫(主要指二化螟、三化螟)是稻区的主要害虫。据调查,历年由于螟虫为害对水稻生产影响很大。一般减产5%,严重的达10—20%。特别是水稻三化螟,对麦茬稻、双季晚稻和杂交水稻(生育期长),为害造成大量的枯心和白穗,减产十分严重。历年来在螟虫防治上,长期多使用666粉剂,螟虫对此药产生一定的抗性,致使施药不断增加,防治效果下降,而且有一定的残毒性,影响人、畜健康。1978年进行了呋喃丹新农药防治水稻二化螟、三化螟的药效试验。从结果来看,呋喃丹对水稻二化螟、三化螟杀虫效果为98—100%,较666粉剂具有药效持续时期长、杀虫率高、无残毒等优点。
Stem borers (mainly Chilo suppressalis, borer) is the main pests in the rice area. According to the survey, the impact of rice stem borers on rice production has been greatly affected over the years. The general reduction of 5%, a serious 10-20%. In particular, rice stem borer, wheat stubble rice, double late rice and hybrid rice (long period of growth), causing damage caused by a large number of white and spike, yield is very serious. Over the years in the prevention and treatment of stem borers, the long-term use of 666 powder, stem borers have some resistance to the drug, resulting in increasing application, prevention and control decreased, and have some residual toxicity, affecting people and livestock health. In 1978, a new pesticide carbofuran control of rice stem borer, yellow rice borer efficacy test. From the results, the insecticidal effect of carbofuran on rice stem borer, rice borer is 98-100%, compared with 666 powder has a long duration of efficacy, high insecticidal rate, no residue and so on.