波尔多液、石硫合剂是果园中常用的药剂。波尔多液是一种良好的保护性杀菌剂,宜在病菌侵入前使用,应用范围广,对真菌引起的霜霉病、软腐病、炭疽病、幼苗猝倒病等有良好的防治作用,但对白粉病防效较差。而石硫合剂是一种杀菌、杀螨、杀虫药剂,一般在病害开始时使用,主要用于防治叶斑病、锈病、白粉病,对介壳虫和一些螨卵防治效果也很好,但对霜霉病防治效果较差。 波尔多液使用时应注意:(1)苹果对铜素较敏感,易发生药害,应采用多量式或等量式波尔多液。此外,金冠、黄玉等果实易受波尔多液的刺激而产生 Bordeaux mixture, lime sulfur mixture is commonly used in orchards. Bordeaux mixture is a kind of good protective fungicide, which should be used before the bacteria invade. It has a wide range of applications and good control effects on fungal-caused downy mildew, soft rot, anthracnose and seedling damping-off. However, Prevention of powdery mildew is poor. The lime sulfur mixture is a kind of bactericidal, acaricidal and insecticidal agent, which is usually used at the beginning of the disease. It is mainly used for the control of leaf spot, rust and powdery mildew, and is very effective in controlling scale insects and some mite eggs. However, The effect of downy mildew prevention and treatment is poor. Bordeaux mixture should pay attention to the use: (1) Apple is more sensitive to copper, prone to injury, should be used in large quantities or equal volume Bordeaux mixture. In addition, Golden Delicious, topaz and other fruits are easily stimulated by Bordeaux mixture