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笔者近年经过对抗虫棉田和非抗虫棉田多种病虫、多代次的对比调查,抗虫棉与非抗虫棉病虫发生有明显差异。抗虫棉棉花蚜虫、棉叶螨、大灰象甲及棉花苗病、枯萎病、黄萎病等,发生均高于非抗虫棉;对二代棉铃虫的抗性较强,一般不需要用化学农药防治;对三代棉铃虫的抗性降低,需用化
In recent years, the author conducted a comparative investigation on various pests and diseases of insect-resistant cotton fields and non-insect-resistant cotton fields in many generations. There was a clear difference in occurrence between insect-resistant cotton and non-insect-resistant cotton pests. Insect-resistant cotton Cotton aphids, cotton spider mites, Aster elk and cotton seedling disease, blight, Verticillium wilt were higher than non-resistant cotton; the second generation of cotton bollworm resistance is generally not required With chemical pesticides control; three generations of cotton bollworm resistance to reduce the need to use