枣步曲自然种群生命表的研究及其在测报上的应用

STUDIES ON THE NATURAL POPULATION LIFE TABLE OF ZIZYPHUS GEOMETRID AND ITS USE IN PREDICTION

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.