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根据近期各地对棉蚜越冬寄主及棉田蚜虫基数调查,结合天气预报及生态因素等综合分析,山西省农作物病虫测报站预计棉花苗期蚜虫今年在临猗、永济、盐湖、芮城等主产棉县中等发生。危害盛期在5月中下旬,接近常年。发生面积50万亩。防治建议:(1)5月下旬可从麦田、苜蓿地人工采集七星瓢虫在棉田释放,可有效控制苗蚜,推迟田间施药时间。(2)在天敌少棉蚜危害严重的情况下,对达防治指标(即三叶期
According to a recent survey of cotton aphid wintering hosts and aphids in cotton fields, combined with weather forecast and ecological factors, a comprehensive analysis of crop diseases and insect pests in Shanxi Province is expected this year in cotton seedling aphids in Linqu, Yongji, Salt Lake, Ruicheng and other main Cotton County occurred moderately. Endanger the damaging mid to late May, near perennial. Occurred area of 500000 acres. Prevention and control recommendations: (1) In late May from the wheat field, alfalfa Artificial collection of ladybird ladybird in the cotton field release, which can effectively control the seedling aphid, delayed field application time. (2) In the case of natural enemies less severe cotton aphid cases, the control of indicators reached (ie, three-leaf stage