波尔多液是一种保护性的广谱无机杀菌剂,在果树上使用要注意以下几点:1.讲究配制方法。配制时用80%的水溶解硫酸铜,20%的水溶解生石灰,然后把硫酸铜液缓慢倒入石灰水中,边倒边搅拌。这样配成的波尔多液的沉淀速度比常规配制法缓慢得多,从而可提高防治效果。千万不可将石灰乳倒入硫酸铜液中,否则会使波尔多液胶体颗粒变粗,易产生沉淀。2.注意使用浓度和果树种类。不同种类或不同生 Bordeaux mixture is a protective broad-spectrum inorganic fungicide, the use of fruit trees should pay attention to the following points: 1. Pay attention to the preparation method. Preparation with 80% of the water dissolved copper sulfate, 20% of the water dissolved quicklime, and then pour the copper sulfate solution slowly into the lime water, stirring while pouring. The Bordeaux mixture thus precipitated much more slowly than the conventional formulation, resulting in better control. Do not pour milk of lime into the copper sulfate solution, or Bordeaux mixture of colloidal particles will become coarse, easy to produce precipitation. 2. Note the use of concentrations and types of fruit trees. Different types or different students