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在苏北沿海棉区，棉花套种西瓜已有２０多年的历史，但是由于棉田中的西瓜正在膨大时，正逢棉铃虫等害虫危害猖獗期，棉农频繁喷药治虫，西瓜中农药成分远远超过其它形式种植的水平；西瓜产量低，品质差，效益低而不稳。为了提高棉套西瓜品质，控制污染，自１９９９年以来我们
In the coastal areas of northern Jiangsu, cotton has been used for watermelon for more than 20 years. However, due to the swollen watermelons in the cotton fields, pests such as cotton bollworm and other pests are damaging. Cotton farmers frequently spray pesticides far beyond the pesticide components Other forms of planting level; watermelon low yield, poor quality, low efficiency and instability. In order to improve the quality of cotton cover watermelon, pollution control, since 1999, we