在防治果树病害时,人们常会选择各种不同的杀菌剂。杀菌剂直接作用于果树的各个部位,在防治病害的同时也会对果树本身产生一些负面影响,如花、果、芽和叶等部位会出现斑点或焦枯,根及其他一些器官发育不正常,引起落叶、落花、落果等,这些现象人们均称之为药害。研究药害的成因及预防对策,是使用杀菌剂时必须注意的问题。药害产生的原因。一是药剂本身。有经验的果农都知道, In the prevention and treatment of fruit tree diseases, people often choose a variety of different fungicides. Fungicides act directly on the various parts of the fruit tree, in the prevention and treatment of diseases will also have some negative effects on the fruit itself, such as flowers, fruits, buds and leaves and other parts will appear spots or scorch, root and some other organ dysplasia, causing Deciduous, falling flowers, falling fruit, etc., these phenomena are called as people harm. Study of the causes of injury and preventive measures is the use of fungicides must pay attention to. Causes of injury. First, the agent itself. Experienced farmers know,