落叶病是苹果树褐斑病、轮纹病、园斑病及灰斑病的总称。烂根病包括白绢病、根朽病和紫纹羽病。两病多发生于雨季,尤其是高温多雨、日照稀少的月份,发病最为普遍。发生落叶病后可引起叶片早衰、早落,影响树势,落叶较多的果树常使后期果实不能正常成熟,有时还会造成早期落果,致使果实产量、品质下降;而烂根病还会影响到来年长势及果实生产。因而,应早防治。 Deciduous disease is the general term for apple tree leaf spot, ring rot disease, patch leaf spot and gray spot disease. Rotten root disease includes sclerotium, root rot and purple pattern feather disease. Two diseases occur in the rainy season, especially in hot and rainy, sparsely sunshine months, the incidence of the most common. Occurrence of deciduous leaves can cause premature leaf failure, early fall, affecting the tree potential, deciduous trees often make late fruit can not be normal maturity, and sometimes result in early fruit drop, resulting in reduced fruit yield and quality; and rotten root disease will also affect The coming year and fruit production. Therefore, should be early prevention and treatment.