红铃虫是棉花蕾、铃期主要害虫之一。在我县丘陵滨湖棉区一年发生3—4代。近年来,全县各棉区普遍严重发生危害,常因害减产2—3成,特别是大发生的73、76、78年,虫蕾率达4.31—14%,虫花率15.03—45.22%,僵瓣率31.45—43.73%,每亩有虫20536—81974条,严重影响棉花产量和质量。为了摸清红铃虫发生规律与外界环境的关系,抓住要害,采取措施,及时防治,减轻危害,确保棉花优质高产丰收,从一九七三年起,对红铃虫发生规律及消长因素,作了初步的调查研究,现综述如下:一、发生情况红铃虫以末代老熟幼虫在棉仓、枯铃、棉籽内越冬。其中以在棉仓越冬的最多,占总越冬虫量的80%;其次,枯铃内占17—19%;棉籽内最少,仅占1—3%。翌年五月上旬,温度稳定在18℃,越冬幼虫开始化蛹,五月下旬至六月上旬化蛹盛期,六月下 Red bollworm is one of the major pests in cotton buds and bolls. Hilly Lakes in our county occurred 3-4 generations a year. In recent years, the county cotton area generally serious harm, often due to damage cut 2-3, especially in the big occurrence of 73,76,78 years, insect buds rate of 4.31-14%, insect flower rate of 15.03-45.22% , Cadaver rate of 31.45-43.73%, 20536-81974 per acre worm, seriously affecting the yield and quality of cotton. In order to find out the relationship between the law of occurrence of the red bollworm and the external environment, we should grasp the key and take measures to prevent and reduce the harm in time so as to ensure the high yield and high yield of cotton. Since 1973, the occurrence and growth of the red bollworm , Made a preliminary investigation, are summarized as follows: First, the occurrence of pink bollworm last mature larvae in the cotton warehouse, bell, winter cottonseed. Among them, the most wintering occurred in the cotton silo, accounting for 80% of the total amount of overwintering insects. Secondly, 17-19% were in the bellwort and the least in cottonseed, accounting for only 1-3%. Early May the following year, the temperature was stable at 18 ℃, overwintering larvae began to pupate, from late May to early June pupation peak, in June