丰都县角倍蚜冬寄主筛选及其资源的初步调查

AN INVESTIGATION ON SELECTING THE MOSS AS THE WINTER HOST OF THE HORNED GALL APHID AND A PRELIMINARY STUDY ON THE NATURAL RESOURCES OF THE MOSS IN FENGDU,SICHUAN

从1990年10月上旬至1991年4月中旬,在丰都县进行了角倍蚜最适宜越冬寄主匐灯藓类人工藓盘植藓养蚜越冬效果对比试验,并于野外调查不同种的匐灯藓上自然越冬的角倍蚜越冬世代存活情况,筛选出丰都县角倍蚜最优冬寄主为侧枝匐灯藓(侧枝匐灯藓凹顶变种)及钝叶匐灯藓。同时调查了该县该三种藓类分布广泛而丰富的自然资源状况,为大面积发展五倍子人工经营的可能性提供了倍蚜虫冬寄主资源状况方面的依据。

Among the three major factors of efficient producing chinese gallnuts,some mosses as the winter hosts of the gall aphids play a decisive role.This paper reports the results of an investigation on selecting the moss as the most suitable winter hosts of the horned gall aphids,Schlectendalia chinensis(Bell),and a preliminary study on its natural resources in Fengdu County,Sichuan Province,which was done from October 1990 to April 1991. The three species of the moss Plagiomnium maximoviczii(Lindb,)T,Kop.,Plagiomnium maximoviczii Lindb.var.emarginatum Chen ex Li et Zhang and Plagiomnium acutum (Lindb.)T.Kop.were recognized as the most suitable winter hosts of the horned gall aphids in Fengdu.Before the gall aphids migrate from the moss to the summer host trees in spring,as in the case of artifical planting moss-plate,the average number of the living overwintering nymphs of the first two species of the winter host moss amounts to 18469.4 and 10375.0 per m^2 respectively,in the case of natural growing winter host moss,the av- erage number of the nymphs on the three species of the moss mentioned above amounts to 3163.4,5124.7 and 3395.7 per m^2 respectively.These three species of the moss usually grow at the wet locations in Fengdu,i.e.on the surface of the wet soil or rocks,and un- der the humid fir woods or other kinds of the evergreen woods.The host moss is widely distributed,and often grows in large patches especially at the south bank of Yangtze Riv- er in Fengdu.The natural resources of these three species of the host moss are rich in Fengdu County,and these offer good developing bases for producting chinese gallnuts.