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一、草地螟的发生危害及其防治意义草地螟是我国北方农田、牧草的主要害虫之一。在呼盟具有间歇性突然爆发的特点。并造成毁灾性灾害。在呼盟五十年代曾大发生为害,从七八年开始,牧区和林区边缘地带零星发生。八○年农区、牧区的农田和草场普遍发生,面积达六百万亩,危害面积一百八十四万亩。八一年发生面积三十二万亩,危害较轻。八二年全盟普遍大发生,蛾量大,来势猛、发生时间长,是前所未有的。其危害面积达九百万亩,造成严重的经济损失。
First, the occurrence of grasshopper hazards and its prevention and control of Meadow borers is China’s northern farmland, pasture one of the major pests. In the call for a sudden burst of intermittent features. And cause disaster disastrous disaster. In the early 1950s, Zeng Da suffered serious harm. Since 1978, sporadic pastoral areas and forested areas have sporadically occurred. In the past eight years, farmland and grassland in pastoral areas have commonly occurred, with an area of 6 million mu and an area of 1.84 million mu. An area of 321,000 mu occurred in August, less harmful. The alliance between the two countries generally occurred a great deal in the past two years. The moths are huge and the situation is so fierce that they take a long time to come. They are unprecedented. Its damage area amounts to nine million mu, causing serious economic losses.