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近几年来,我地水稻受大螟危害极其严重,特别是那些叶色浓绿、茎秆粗壮、氮素含量高的高产品种,受害更大。若在水稻生长期用药剂防治,化工多,化钱多,收效小。怎样有效地防治大螟危害,是夺取水稻丰收的一个重要环节。对此,我作了许多试验,摸索治大螟的方法。试验结果表明,在稻桩上泼浇农药稀释液,药杀稻桩内大螟,有较好的防治效果。为了药杀大螟,我首先观察了大螟的生活规律和特点。发现大螟和其它螟虫不同,它集中在田岸边15—20棵稻的范围内危害,大部分幼虫躲藏在水稻收割后的稻桩内越冬。根据这些情况,近两年来分别作了两次药杀稻桩内虫源的试验,效果很好。死亡率达95%以上。1977年在杂交稻南优2号收
In recent years, my rice has been greatly endangered by Sesamia inferens, especially those high-yielding varieties with thick green leaves, stalks and high nitrogen content. If the rice growing season with chemical control, chemical industry, more money, less effective. How to effectively control the harm of Sesamia inferens is an important link to seize the harvest of rice. In this regard, I made a lot of tests, to find ways to cure Sesamia inferens. The test results show that spraying the pesticide dilution on the rice piles and controlling the Sesamia inferens to kill the rice piles have better control effects. In order to kill Sesamia inferens, I first observed the life rules and characteristics of Sesamia inferens. It was found that Sesamia inferens, unlike other stem borers, are concentrated in the range of 15 to 20 rice fields along the shore of the field and most of the larvae survive in winter after they have been harvested. According to these circumstances, in the past two years, two experiments were conducted to kill insects inside the piles of insects, with good results. Mortality rate of 95% or more. In 1977 hybrid rice Nam You 2 received