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苹果斑点落叶病(Alternaria maliRoberts)属苹果轮斑病强毒株系,日本1956年首次发现,国内七十年代未始见为害,1983年青岛农科所完成了该病的病原鉴定。我地属季风区大陆性气候,近几年该病为害日益严重,易感品种逐年增多,导致叶片大量早落,明显影响树势及翌年开花座果。为此,我们于1990～1992年在莒县浮来山园艺场、临沐县时宅子园艺场、临沂市林郑旺苹果园以元帅系为主,定点观测了该病的田间发生动态及影响因子,并进行了药剂防治适期和用药种类的筛选试验,现将主要结果报告如下。
Alternaria maliRoberts is a virulent strain of apple leaf spot disease. It was first discovered in Japan in 1956 that it was not found in the seventies in China. In 1983, Qingdao Agricultural Institute completed the identification of the pathogen. I belong to the monsoon zone continental climate, in recent years the disease is increasingly serious, susceptible varieties increased year by year, leading to a large number of early leaf fall, significantly affect the tree vigor and the flowering fruit the following year. To this end, we from 1990 to 1992 in the floating County, Lixian horticultural field, Linmu County, Zhaizi horticultural field, Linyi City Linzheng Wang apple orchards to Marshal Department, a fixed point observed the disease dynamics and the impact of the field Factor, and carried out the appropriate drug control and drug types of screening tests, the main results are reported as follows.