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(一)抗虫育种近年来,由于害虫产生抗药性,不仅增加用药量和治虫次数,提高植棉成本,而且达不到实际防治效果,并且,由于大量使用农药形成环境污染,不少国家限制使用农药。因此,不少产棉国对选育抗虫品种给予愈来愈多的重视。棉花抗虫育种已有的进展,是研究明确了多种有效的抗虫性状,并已成功地将有些性状结合在栽培品种上。如非洲的茎叶多茸毛类型棉花对蚜虫和跳(虫甲)具有明显抗性,窄而卷曲的苞叶可减少棉铃象鼻虫和棉铃虫产卵量50—70％,鸡脚叶、光滑叶也能显著减少夜蛾科虫卵的附着及幼虫虫口;无花外蜜
(I) Insect breeding In recent years, due to the resistance of pests, it not only increases the dosage and the number of pests, but also increases the cost of cotton planting, and can not reach the actual prevention and cure effect. Moreover, due to extensive use of pesticides to form environmental pollution, many national restrictions Use pesticides. Therefore, many cotton producing countries pay more and more attention to breeding insect-resistant varieties. Advances in cotton insect breeding have led to the identification of a number of effective insect resistance traits and the successful integration of some traits with cultivars. For example, cotton with stem-leaf-hairy species in Africa has obvious resistance to aphids and hop (insect), while narrow and curly bracts reduce the number of eggs laid by the weevil and the bollworm by 50-70% Leaves can also significantly reduce the attachment of larvae and the larvae;