摘要
1986—1989年在河南省新乡棉区对一至四代棉铃虫自然种群进行系统观测,组建9个生命表、3个生殖力表。棉铃虫自然种群存活曲线属Pric A型,种群趋势指数I依次为4.3719、0.3756、1.9577、1.0094,世代存活率为0.700%、0.059%、0.310%、0.176%。棉铃虫幼虫期受自然天敌控制作用显著,种群控制指数IPC依次为8.5164、29.7463、10.7798、14.2910。二龄期被寄生是影响棉铃虫一至四代全年种群数量变动的关键因子,五龄被捕食是影响不同年份间第二代种群数量变动的关键因子。一至三代的自然增殖率依次为0.0391、-0.0470、0.0462,周限增长率为1.0398、0.9541、1.0473。化学防治对下代种群档势指数影响强烈。
In 1986—1989,systematic observations on 1st—4th generations of
cotton bollworm Heliothis armigera Hübner were carried out in Xinxiang
County,Henan Province.Based on those investigatory data,nine natu-
ral population life tables and three reproduction tables of different
bollworm generations feeding on cotton and wheat in different years
were developed.The results showed as follows: 1.All the survival curves from those life tables belonged to
Price′s type A.
2.The trend indices of population and survival rates of 1st—4th
generations were 4.3719,0.3756,1.9557,1.0094;and 0.700%,0.059%,
0.810%,0.176%,respectively.
3.There was significant suppression effect of natural enemies on
bollworm immatural stage and indices of population control(IPC)in
accordance with the generation sequence were 8.5164,29.7463,10.7798
and 14.2910,respectively.
4.The parasitism of 2nd-instar larvae and predation of the 5th
-instar larvae were the key factors affecting population dynamics of
1st—4th generations whole year,and 2nd generation.
5.The natural increase rate and finite rate of increase of 1st—3rd
generations were 0.0391,-0.0470,0.0462;and 1.0398,0.9541,1.0473,
respectively.
6.Significant negative effect of chemical control on I value of
next generation was found.
出处
《植物保护学报》
CAS
CSCD
北大核心
1991年第3期199-206,共8页
Journal of Plant Protection
关键词
棉铃虫
生命表
种群动态
Heliothis armigera
life table
population dynamics
