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地膜覆盖棉花出苗早,发育快,生长迅速,枝叶茂盛,封行早,荫蔽严重,病虫害的发生规律也起了变化。为此,1982年我们对塑膜覆盖棉花的一些病虫害进行了调查,结果如下。一、调查方法定点调查和大田调查相结合。定点调查在郭河大队选择覆盖和直播各半的一块棉田,面积5亩,以直播棉田为对照。从5月5日到8月30日,每5天调查1次。每次各
Cotton film mulching early emergence, rapid development, rapid growth, lush foliage, seal line early, a serious shade, the occurrence of pests and diseases also changed. To this end, we conducted a survey of some pests and diseases of plastic film covered cotton in 1982 with the following results. First, the survey method Site-specific surveys and field surveys combined. Point-by-point investigation in the Kwok fleet to choose to cover and broadcast a half of a cotton field, an area of 5 acres, with live cotton as a control. From May 5 to August 30, a survey is conducted every 5 days. Each time