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应用生态学报 ›› 2000, Vol. ›› Issue (6): 856-860.

• 研究论文 • 上一篇    下一篇

不同控制条件下棉铃虫自然种群生命表研究

杨益众, 庞雄飞, 梁广文   

  1. 华南农业大学昆虫生态研究室, 广州510642
  • 收稿日期:2000-04-13 修回日期:2000-06-19
  • 通讯作者: 杨益众,男,1960年生,博士,副教授,主要从事农业昆虫综合治理和生态调控,发表论文30多篇.
  • 基金资助:
    江苏省教委基金资助项目

Lifetable of cotton bollworm under different control condition

YANG Yizhong, PANG Xionfei, LIANG Guangwen   

  1. Laboratory Insect Ecology, South China Agricultural University, Guangzhou 510642
  • Received:2000-04-13 Revised:2000-06-19

摘要: 用作用因子组建的种群生命表方法组建了4种不同控制措施下的第3、4代棉铃虫自然种群生命表.结果表明,自然条件下第3、4代棉铃虫卵的寄生率分别为4.93%、1.19%,被捕食率平均21.11%和15.80%.第3、4代幼虫寄生率分别为19.34%、16.20%.结果表明,第3、4代棉铃虫自然种群增长指数分别仅0.1921、0.1228;采用选择性杀虫剂IKI和Bt制剂组合防治棉铃虫后.第3、4代种群增长指数仅0.0032和0.0014.且这样的控制措施对棉铃虫捕食、寄生性天敌影响较小.棉田连续喷洒化学杀虫剂后,虽然降低了棉铃虫种群增长率,但化学防治区第3、4代棉铃虫幼虫寄生率比对照区分别降低48.66%和61.67%,捕食性天敌数量分别降低23.48%和41.26%.采用转Bt基因棉对棉铃虫种群数量有较大的抑制作用且对捕食性天敌影响不大,但与自然控制区相比,3代幼虫寄生率下降了51.14%,4代幼虫寄生率为0.

关键词: 棉铃虫, 控制措施, 生命表, 干扰作用控制指数

Abstract: The lifetables of 3rd and 4th generation of cotton bollworm Helicoverpa armigera Hubner were established by action factors under four different control conditions.The results showed that under natural control,the egg parasitic rates of 3rd and 4th cotton bollworm were 4.39% and 1.19%,the predatory rates were 21.11% and 15.80%,and the larvae parasitic rates were 19.34% and 16.20% respectively.The indexes of population trend were only 0.0032 and 0.0014 respectively,after using selective pesticides IKI and Bt to control cotton bollworm.Though the index of population trend decreased to 48.66% and 61.67% after contantly praying chemical pesticides,the number of predators also decreaseed to 23.48% and 41.26% respectively.Transgenic Bt cotton could inhibit the population increase of cotton bollworm,but had no effect on predators.The parasitic rates of 3rd and 4th cotton bollworm on Transgenic Bt cotton were 51.14% and 0% respectively,as compared to control.

Key words: Cotton bollworm, Control means, Lifetable, Interference index of population control(IIPC)