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一、主要病虫害种类1.主要病害①腐烂病病原属子囊菌门半知菌类真菌,危害枝干,由冻伤、虫伤、剪锯口及自然伤口处侵染,树干发病可造成大枝或整株死亡。②黄化病生理性病害,地下水位高、土壤含盐量大、树体负载过重、大量使用化肥、灌水过多、土壤pH值高等因素都易引起黄化病发生。发病原因与铁、锌等元素的吸收障碍有关,发病时叶色变黄,严重时叶片变白脱落,发病严重的果园树体衰弱,易诱发腐烂病,造成大枝或整株死亡。
First, the main types of pests and diseases 1. The main disease ① rot disease belongs to Ascomycete half-know fungi, harm the branches, frostbite, insect wounds, cut and saw wounds and natural wound infection, the trunk can cause large branches or whole disease Strain died. Â’¡ yellow disease physiological diseases, high groundwater levels, soil salinity, tree overload, the heavy use of fertilizers, excessive irrigation, soil pH and other factors are likely to cause yellow disease. The cause of the disease is related to the absorption disorder of elements such as iron and zinc. When the disease occurs, the leaf color turns yellow, and the leaves become white and fall when the disease is serious. The orchard tree with serious disease is weak and easy to cause the rot disease, resulting in the death of the big branch or whole plant.