摘要
北京杨锉叶蜂在华北地区杨树苗圃中普遍发生，严重危害黑杨派杨树。在北京地区１ａ发生８～９代，林间以个体群呈聚集分布，以老熟幼虫入土结茧越冬。孤雌生殖后代为雄虫，两性生殖为雌、雄虫。通常雄虫４龄、雌虫５龄。温度影响着北京杨锉叶蜂的羽化及孵化，是种群动态变化的决定因素。在温度适宜及食源充足的状况下，种群保持指数增长，世代差分方程中Ｒ０＝１．４。有效积温为４０００日度。利用病毒、苏云金杆菌及线虫防治，效果分别达９２．９％、１００％、８５．１％。
Pristiphora beijingensis, distributing in North China,is
an important pest inpoplar nursery.It attacks mainly poplar trees belonging to Section Aigeiros.
With both am-phimixis and parthenogenesis it can develop 8～9 generations a year in Beijing
area and over-winters as prepupae in cocoon in the soil.It produces only males if without
mating,but bothmales and females after mating. The females have five instars while males
have four instars.According to the study in 1991～1992,the spatial pattern of P. beijingensis is
aggregation,thebasic unit is clump. Temperature is the key factor for the population
dynamics,which influ-ences emergence and hatching. Under the condition of sufficient food and
suitable tempera-ture,the population will have an exponential increase with the inner natural
increase rate Ro=1.4。Using PbNPV,B.t.,and entomopathogenic nematodes to control it,the
mortalitycould reach 92.9%,100%and 85.1%respectively.
出处
《林业科学研究》
CSCD
北大核心
1995年第5期556-563,共8页
Forest Research
基金
1990~1992年国家自然科学基金
