棉夜蛾又名棉小造桥虫,是棉麻主要害虫之一。1973年后,我县棉夜蛾的发生有上升趋势,每年以第三代至第五代发生多,去年是大发生。一、生活周期棉夜蛾在本地以蛹越冬,越冬场所较复杂,主要在木槿等寄主上结茧越冬,翌年5月上旬羽化为一代成虫。幼虫为害木槿等早春寄主,6月中旬二代成虫飞入棉田产卵,以后约隔1个月发生一代,一年可发生六代和不完全的七代。各代成虫的发生期见表1。 Cotton bollworm, also known as small cotton bridge made of cotton, is one of the major cotton insects. After 1973, the incidence of cotton bollworm in our county has been on the rise. It takes place every year from the third to the fifth generation, and last year was a big occurrence. First, the life cycle of cotton bollworm in the local winter with pupae, more complex winter place, mainly in the hibiscus and other host cocoon overwintering, early May the following year eclosion into a generation of adults. Larvae and other early victims of hibiscus host, in mid-June the second generation of adult fly into the cotton spawning, after a generation about a month later, one year can occur six generations and incomplete seven generations. The occurrence of each generation of adults in Table 1.