Author: Zhongchuan Peony Publish Time: 2024-11-13 Origin: Site
Common Diseases of Tree Peony - Gray Mold
Gray mold
Symptoms: Gray mold can occur during the growing season of tree peonies, causing serious harm to young plants and leading to lodging and withering of seedlings. When damaged, brown water stains appear on the stem, rot, and the seedlings wither and fall. Leaves are infected, resulting in irregular water stained lesions. There are more lesions on the tips and edges of the leaves, which are mostly brown or purple brown, sometimes with irregular whorls. When the weather is humid, gray mold like substances grow on the affected areas. The disease spots on the petiole and leaf stem are mostly elongated, dark brown, slightly depressed, and the affected area is prone to breakage. Flower buds become brown and dry due to infection, while petals turn brown and rot.
Prevention and control methods:
Reduce sources of infection: timely clean the dead branches and leaves of diseased plants in autumn, remove diseased shoots and leaves in spring when the disease occurs, and deeply bury the diseased remains.
Chemical control: once the disease occurs in the growing season, 1% lime equivalent Bordeaux solution, 70% methylthiophanate 1000 times solution, 65% mancozeb 500 times solution or 50% chloronitramine 1000 times solution can be used for spray control. Spray every 1015 days for 23 consecutive times.
Strengthen cultivation management: moderate planting density, timely drainage after rain, and do not wet the soil at the base of the plant cluster; Crop rotation should be implemented in severely ill areas; Plant disease-free seedlings, which can be soaked in a 300 fold solution of 65% mancozeb for 10-15 minutes.
