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棉花蕾铃期害虫天敌种类很多,其发生消长受气候、棉田环境、害虫密度等多种因子的影响,年度、地块间差异较大。自然中常出现天敌有效控制棉蚜、棉铃虫的例证。为了明确棉花蕾铃期主要害虫天敌种群消长动态规律,现将1979年调查结果总结如下。一、蕾铃期主要天敌种类及消长动态蕾铃期棉田主要扑食性天敌种群组成是:草蛉占47.2％、瓢虫占24.1％、食虫椿占22.9％、蜘蛛类占5.7％、其他为0.1％。草蛉类以中华草蛉最多占38.7％,其次是叶色草蛉占35.0％,丽草蛉占22.6％,大草蛉最少占3.6％;瓢虫类以多异瓢虫最多占64.7％,其次是龟纹瓢虫占20.4％,黑襟毛瓢虫占13.70/,七星瓢虫最少占1.1％;食虫椿类以小花椿为最多占90.3％,华野
There are many kinds of insect natural enemies during boll boll stage. The occurrence and growth of cotton boll instars are affected by many factors, such as climate, cotton field environment and pest density. Natural enemies of natural enemies often appear to control cotton aphids, cotton bollworm example. In order to clarify the dynamics of the population dynamics of major pest natural enemies in cotton boll stage, the results of the survey in 1979 are summarized as follows. First, the main types of natural enemies in the budding period and the dynamics of growth The predominant population of predation enemies in cotton bollworms is 47.2% in the cotton bollworms, 24.1% in ladybugs, 22.9% in insectivorous insects, 5.7% in spiders, and the others are 0.1%. The highest percentage of Chinese weeds was 38.7%, followed by 35.0% of the leaves, 22.6% of the wild grass and 3.6% of the wild grass, while the ladybugs accounted for 64.7% of the total, Is the tortoise Ladybug accounted for 20.4%, black braid ladybug accounted for 13.70 /, Cephalus ladybugs accounted for at least 1.1%; insects Tsubaki to small cedar for up to 90.3%, wild