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波尔多液是果树上应用时间最久,应用范围最广的保护性杀菌剂。但波尔多液配制使用不当,很容易发生药害,生产上应引起注意。波尔多液引起的药害,主要有两类。一是由铜离子引起的药害,症状表现为:受害叶片自叶尖开始变黑,逐渐干枯,向叶柄方向蔓延到叶片一半,以致出现坏死斑,其至穿孔;受害果实有锈斑、麻斑,这在金冠、胜利等苹果品种上时有发生。二是由石灰引起的药害,表现为受害叶片生长畸形,变厚而粗糙;果皮出现硬化。波尔多液配制和使用不当是引起药害的主要原因。配制波尔多液时,硫酸铜溶解不完全,连同药渣喷到果实上,
Bordeaux mixture of fruit is the longest application, the most widely used protective fungicide. However, improper use of Bordeaux mixture preparation, it is prone to injury, should pay attention to the production. Bordeaux mixture caused by injury, there are two main categories. First, the injury caused by copper ions, symptoms are as follows: the victim leaves began to darken the tip, gradually dry, to the petiole spread to half of the leaves, resulting in necrotic spots, its to perforation; victims of fruit rust, plaque , Which occurred in the Golden Delicious, Victory and other apple varieties from time to time. Second, phytotoxicity caused by lime, manifested as damaged leaf growth deformity, thick and rough; peel sclerosis. Bordeaux mixture preparation and improper use is the main reason causing injury. Preparation of Bordeaux mixture, the dissolution of copper sulfate is not complete, together with the dregs sprayed onto the fruit,