摘要
白榆干枯病在陕北１ａ内有２个发病高峰期，８月为感病高峰期，翌年４月为发病死亡高峰期。病原菌茎点霉菌（ＰｈｏｍａＳａｃｃ．）的分生孢子主要靠气流，雨水击溅传播，昆虫活动对传播也有一定影响。病原菌主要从伤口和皮孔侵入。感病最适温度为１８～２７℃，相对湿度６５％～１００％。树龄６～１１年生植株最易感病，感染后发病快，死亡率高。
The withered disease of Ulmus\ pumila is very serious in Northern Shaanxi. There are two height periods in a year:disease infection in August of current year and high death rate occurred in April of next year.The spread of Phoma Sacc. spores mainly relys on the airstream and rainfall,as well as insect movement.Germs invade the bark from wound and bark holes.The favorable infection temperature is 18￣27℃,the relative humidity is 65%￣100%.The susceptable age of the tree is 6￣11 years old with higher death rate.
出处
《西北林学院学报》
CSCD
北大核心
1999年第2期45-50,共6页
Journal of Northwest Forestry University
基金
陕西省科委资助
关键词
白榆干枯病
茎点霉菌
发生规律
Ulmus pumila
withered disease
Phoma Sacc
occurrence regularity
