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近年来,棉铃虫尤其是第二代棉铃虫发生普遍严重。去年我县早在6月15日就已达到或超过防治指标,单株累计有虫10—15头。有些棉田由于除治不及时。不少棉株1—3个果枝上的幼蕾大部分被咬掉。棉花幼蕾被咬掉后,由于生殖生长减少了养分消耗,流向营养生长的养分便多了,因而会出现茎、枝、叶旺长。棉花顶尖被咬后,便出现枝叶丛生。对这些情况,有些棉农认为当年棉花无望了,想改种其它作物。其实这种棉花虽然受害严重,为
In recent years, the occurrence of cotton bollworm, especially the second generation of cotton bollworm is generally serious. Last year, our county had already met or exceeded the prevention and control targets as early as June 15, and a total of 10-15 insects per plant were accumulated. Some cotton fields due to cure in a timely manner. Many cotton plants 1-3 fruiting branches of young buds are mostly bite off. Cotton buds are bite off, due to reduced reproductive growth of nutrient consumption, nutrients flow to nutrition will be more, and therefore there will be stems, branches, leaves Wang long. The top of the cotton bite, there are foliage clusters. In these cases, some cotton farmers think there is no hope of cotton that year, want to switch to other crops. In fact, although this kind of cotton is seriously harmed,