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 2 1 11%和 15 80 % .第 3、4代幼虫寄生率分别为 19 34%、16 2 0 % .结果表明 ,第 3、4代棉铃虫自然种群增长指数分别仅 0 192 1、0 12 2 8;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 0 0 32和 0 0 0 14 .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 6 6 %和 6 1 6 7% ,捕食性天敌数量分别降低2 3 48%和 41 2 6 % .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 5 1 14 % ,4代幼虫寄生率为 0 .
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.
出处
《应用生态学报》
CAS
CSCD
2000年第6期856-860,共5页
Chinese Journal of Applied Ecology
基金
江苏省教委基金资助项目
关键词
棉铃虫
控制措施
生命表
干扰作用控制指数
Cotton bollworm, Control means, Lifetable,Interference index of population control(IIPC)@
