【摘要】 通过30a的系统调查表明,望江县以四代棉铃虫为主害代,棉铃虫各代次发生程度的主控因子不同,棉铃虫对常用农药表现出明显的抗性,保铃棉32B对各代棉铃虫均表现出良好抗性。对棉铃虫暴发因子进行了探析,认为棉铃虫近几年处于活跃期,旱地种植结构调整、梅天雨日雨量少、棉花生育期提早是棉铃虫暴发的主要原因。并从农业防治、推广抗虫品种、改进化防技术等方面提出了防治对策。更多还原

【Abstract】 The result of systemic investigation for 30 years showed that the fourth generation of cotton bollworm was the major generation which infested the cotton, the main factors affecting the damage degree were different in different generations. Cotton bollworm was apparently resistant to insecticide. Bt cotton (Baoling) showed significant resistance to different generations of cotton bollworm. The main factors affected the outbreak of cotton bollworm suggests could be identified as the reiteration of crop pattern in dry field, the decrease of rainfall in rainy period and the extension of cotton growth duration. The controlling measures are put forward as agricultural control, using cotton bollworm resistance varieties, improving the technique of chemical control.更多还原