果树的病害和一般植物病害一样可以分为寄生病害和非寄生病害。寄生病害中又有真菌病、细菌病、毒病和微小害虫寄生病害等;非寄生病害中有营养失调引起的病害,温度不当引起的病害,空气中气体成分不当引起的病害,日灼病,药害等。至于我国的果树病害,如苹果腐烂病则为苹果的主要病害(图1)。可是其他国家里苹果 The diseases of fruit trees can be divided into parasitic diseases and non-parasitic diseases like the general plant diseases. Parasitic diseases have fungal diseases, bacterial diseases, toxic diseases and pests parasitic diseases, etc .; non-parasitic diseases caused by malnutrition, diseases caused by improper temperature, improper air composition caused by gas diseases, sunburn, Injury and so on. As for China’s fruit tree diseases, such as apple rot disease is the main disease of apple (Figure 1). But in other countries, apples