假眼小绿叶蝉自然天敌控制作用的评价

对假眼小绿叶蝉的卵期寄生蜂－缨小蜂进行了初步调查观察，并应用生命表方法对假眼小绿叶蝉的寄生性和捕食性天敌作用作了评价，提出了卵期寄生是一种重要的天敌控制因子，通过高峰期世代自然园与化防轩绿叶蝉生命表比较，结果表明，自然园种群趋势指数为１．０９，化防园为２．７１，模拟采摘试验，下一世代种群趋势指数均小于１，数量将下降。

Evaluation of the Effectiveness of Natural Enemies of Empoasca(E.)vitis(Gothe)

Anagrus sp.-parasited in egg-stage of Empoasca(E.)vitis Gothe(EV)was studied,theeffectivenass of parasites and predators on the dynamies of EV were evaluated by means of lifetable in this paper.The results indicated that the parasitism in egg-stage of EV was the importantcontrol factor.Based on the life tables of" tea-garden"treated with insecticides and untreatedone,the index of population trend of treated tea-garden(2.7l)was higher than untreated one(l.09)during serius affacted season.By the life tables groupe in the plots,which some of the teabuds were picked,treated with insecticide and the cheek,the index of population trend of EV wasless than 1 in both plots, the population density of EV was less decreased. It was similar with theresults of the field investigation.