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自七十年代以来,玉米螟在如皋县对棉花危害逐年加重,近几年虽经反复防治,但第三代玉米螟在全县造成的铃害率仍达6.6±2.56%。因此,玉米螟成为棉花生产上亟待解决的问题。如皋县现有耕地,按土质、水系、作物布局等状况划为三个地区(中西部高沙土、东部通扬运河沿线、沿江圩田),玉米螟在各地区的棉田中发生情况显然不同。
Since the seventies, corn borer in Rugao County, the harm of cotton increased year by year, despite repeated control in recent years, but the third generation of corn borer in the county caused the boll damage rate still reached 6.6 ± 2.56%. Therefore, the corn borer becomes a problem to be solved in cotton production. Rugao existing cropland, according to the soil, water system, crop layout and other conditions into three areas (Central and Western high sand, along the East Tongyang canal, polder along the river), corn borer in the cotton fields in different regions is obviously different.