山楂枝枯病初步研究

近年来，天目山林场发生１种新的山楂枝枯病。经鉴定，该病由ＰｈｏｍｏｐｓｉｓｃｒａｔａｅｇｉＹｕ侵染所致，主要危害山楂１～２年生发育枝、结果枝、幼嫩枝和芽，造成大量枝条和芽枯死，严重影响山楂的生长和产量。病害流行与立地条件和山楂锈病危害的轻重有密切的关系。５月可对病株用５０％多菌灵可湿性粉剂５００倍液和２０％粉锈宁乳油１０００倍液喷冠防治，有一定效果。

A Primary Study on Twig Blight of Crataegus pinnatifida.

The twig blight infected by Phomopsis crataegi,fonud on the Mount Taimu in Zhejiang Province in l992, damages one or two years old develo-pmental branches,bearing branches,yound shoots and buds,withers a lot of branches and buds,and causes a serious result to the growth and yield of Crataegus pinnatifida.Its incidences is closely related to the site conditions and the infective degree of rust disease,and control could made in May by spraying the tree crown with 500-fold solution of carbendazim 50 WP or 1000-fold triadimefon 20EC resulting in the fungi being killed.