Symptoms: Leaves, branches, pedicels, buds, flower buds, and young shoots can all be harmed. At the early stage of disease, a layer of white powdery mildew grows on the surface of the diseased part, which is the conidia of the asexual generation of the pathogen. The late white powdery mildew layer turns pale gray, and the infected leaves or shoots have black, small particles that are produced by the closed shell of the sexual generation of the pathogen. The victim plants are short, not luxuriant, the leaves are uneven or curled, the shoots are malformed, and flowering or flowering malformations are not possible. When it is serious, the flowers are small and small, and the leaves shrink and die, causing the whole plant to die and lose its ornamental value. The common flower powdery mildews include rose powdery mildew, rose powdery mildew, chrysanthemum powdery mildew and greenhouse powdery mildew.

Incidence of the disease: The pathogens overwintered with mycelia or conidia on sick bodies and diseased buds. In early spring, conidia spread through the wind and rain and invade the leaves and shoots. Repeated infections can occur multiple times in the growing season, with severe disease from April to June and September to October. High-temperature drying, excessive nitrogen fertilizer application, excessive dense planting, insufficient sunlight, or poor ventilation have favorable diseases. There are differences in resistance between varieties.

Control methods: 1 Fine pruning in early spring, cut off diseased branches, diseased leaves, and timely burned.

2 Increase phosphorus and potassium fertilizers and control nitrogen fertilizers.

3 In the early stage of the disease, 50% carbendazim WP 800-1000 can be sprayed, or 70% thiophanate-methyl 1000 times. Before germination, spray Baume 3-4 degree lime sulfur, or Bordeaux mixture 1:2:100-200.

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