摘要
在豫北棉区生态条件下 ,田间棉铃虫种群发生趋势表现为 :每代棉铃虫世代发育完成之后种群个体数量均大量减少 ,但不同世代减少的幅度不同 ,在常规年份 ,一代和三代棉铃虫种群个体数量减少的幅度小于二代和四代。以成虫数量比较 ,棉铃虫完成一代发育之后种群个体数量比越冬代 (四代 )有所增加 ,经过二代发育种群个体数量下降 ,而经过三代发育种群个体数量又有所回升 。
That the population occurrence trend of the cotton bollworm in field in zoology condition of the plant cotton area in the north of Henan showed stated regularity. Individual quantity of every generation decrease, but the different generation decrease range were different. In normal years,1st and 3rd generation cotton bollworm population individual quantity decrease range were smaller than 2nd and 4th generation. The basic adult numbers, after cotton bollworm had finished generation performances of development, 1st generation individual quantity had increased as compared with crossing winter generation(4th generation), 2nd generation had decreased as compared with 1st generation, 3rd generation had increased as compared with 2nd generation, 4th generation has decreased as compared with 3rd generation.
出处
《河南职业技术师范学院学报》
2000年第4期7-11,共5页
Journal of Henan Vocation-Technical Teachers College
关键词
豫北
棉铃虫
田间种群
发生趋势
north of Henan
cotton bollworm
population in field
occurrence trend
