抗虫棉花品种（系）的鉴定、选育、利用及其研究进展（一）棉铃虫、棉蚜等害虫是我国棉花生产的重要致灾害虫，常年造成棉花产量损失在１５～２０％之间，产值损失达８亿多美元，全国每年用于棉花害虫防治的杀虫剂量占杀虫剂使用总量的２／３。由于一些地方不合理地施用和... Identification, Breeding, Utilization and Research Advances of Bt Cotton Varieties (Lines) (1) Insects such as cotton bollworm and cotton aphid are major disastrous pests in cotton production in our country. The annual loss of cotton yield is between 15 and 20% With a loss of more than 800 million U.S. dollars in output value. The amount of pesticides used for cotton pest control in the country accounts for about two-thirds of the total pesticide use each year. Due to some unreasonable application and ...