摘要
1989-1995年在山西省太谷枣区、稷山枣区对枣步曲自然种群进行了系统调查,组建了5个年世代生命表,1个平均生命表,枣步曲自然种群存活曲线属PriceA型,平均种群趋势指数I为1.203。枣步曲幼虫期受天敌控制作用显著,种群控制指数为5.739。关键虫期为蛹期,关键因子为蛹的冬季消亡。并根据越冬后正常蛹数及平均生命表中的平均存活率预测次年4龄幼虫,准确率达90%左右,有效地指导了防治。
In 1989- 1995, the natural population life table of zizyphus geometrid Sucra jujubaChu was studied in Taigu County and Jishan County,Shanxi Province Based on the investigatory data,five yearly natural population life tables and one average life table infive years were developed The results showed as follow: 1.All the survival curves from the life tables belong to Price's type A. 2. The trend index of one average population was 1 .203. 3.there was significant suppression effect of natural enemies on the larvae of zizyphus geometrid and the index of population control (IPC) was 5.793. 4.The death of overwintering pupae was the key factor affecting population dynam-ics,and the pupals stage was the key stage. 5. A prediction model for the larvl density of zizyphus geometrid was established.Theaccuracy rate of forecast as used in Taigu County and Jishan County in 1995 was more than 90% it is quite available for the control of this insect.
出处
《林业科学》
EI
CAS
CSCD
北大核心
1997年第3期234-241,共8页
Scientia Silvae Sinicae
基金
山西省自然科学基金