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牡丹的主要病害有:1.叶斑病:叶面出现黑褐色小斑点,而后扩大成不整形轮纹,最后生出黑色霉。防治方法:喷射波尔多液,或500倍代森锌或代森锰。剪除烧毁被害部。2.褐斑病:在叶面上发生淡黄绿小点,后渐扩大,发生褐色乃至黑褐色的轮纹。防治法同叶斑病。3.炭疽病:叶面上初生紫褐小点,后扩大,周边紫褐色,中部形成灰白色圆形斑纹,甚至病部开孔。防治法同上。4.锈病:开花时从叶面开始发生淡黄色小斑点,不久膨大发生橙黄色斑点,而后散出黄色粉末。防治法同上。
The main peony diseases are: 1. Leaf spot disease: dark brown spots on the leaf surface, and then expanded into irregular shaped wheel, and finally gave birth to black mold. Prevention and treatment methods: spray Bordeaux mixture, or 500 times dexamethasone or dexmedetomidine. Cut off burned victimization. 2 brown spot: the occurrence of yellowish-green dots on the foliage, gradually enlarged, the occurrence of brown and even dark brown round pattern. Prevention and cure with leaf spot disease. 3. Anthracnose: purple brown spots on the surface of the newborn, after the expansion of the surrounding purple-brown, the middle of the formation of gray-white markings, and even disease Department openings. Prevention Act as above. 4. Rust: small yellowish spots occurred at the time of flowering from the foliage, and the yellowish orange spots were soon swollen, and then the yellow powder was scattered. Prevention Act as above.