波尔多液是用硫酸铜和生石灰配制成的杀菌剂,具有无抗药性、杀菌力强、对植株安全、药效持久等特点,在果树上广泛使用。但生产上若配制使用不当,常会使叶片或果实发生药害:一是由铜离子引起的药害,叶片自叶尖开始变黑、干枯,并向叶柄方向蔓延,出现坏死斑,甚至穿孔,果实则有锈斑、麻斑;二是由石灰引起的药害,表现为叶片生长畸形、变厚、粗糙,果皮硬化等症状。防止波尔多液药害的方法如下: Bordeaux mixture of copper sulfate and lime is formulated as a fungicide, with no resistance, bactericidal power, plant safety, long lasting and other characteristics, widely used in fruit trees. However, if the preparation of the production of improper use, often leaves or fruit phytotoxicity: First, the injury caused by copper ions, leaves from the leaf tip began to black, dry and spread to petiole, necrotic spots appear, or even perforation, The fruit is rusty, plaque; two is caused by lime injury, manifested as deformity of leaf growth, thickening, rough, peel sclerosis and other symptoms. The method to prevent Bordeaux liquid injury is as follows: