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1发生规律苹果早期落叶病主要有褐斑病、圆斑病、灰斑病和轮斑病四种。一般果园常以褐斑病为主。但最近轮斑病出现了一个具有强致病力的类型。在部分地区造成了严重危害,并将这个类型所致的病害称为“斑点落叶病”。重病年份苹果树的叶片在8月份即大量脱落,造成出二次叶,开二次花,严重消弱树势,影响产量。圆斑病和斑点落叶病发生最早,5月中、下旬即可发病。其它叶斑病大都在6月上、中旬开始发生。7~8月份多雨季节是落叶病的发生盛期。
1 regular occurrence Apple early leaf decay disease are mainly brown spot, round spot, gray spot disease and spotted spot four kinds. Orchard often brown spot-based. Recently, however, there has been a very virulent type of plaque disease. Causing serious damage in some areas and calling this type of disease “spotted leaves disease.” Serious illness of apple tree leaves in August that a large number of off, resulting in a second leaf, open the second flower, severely weakened tree vigor, affecting the yield. The first occurrence of circular spot and spot defoliation disease, May in mid and late onset. Most other leaf spot disease in June, mid-start. 7 to August rainy season is the peak of the occurrence of deciduous disease.