How to Treat Powdery Mildew on Flowers? A Detailed Guide to Practical Control Methods

How do you treat powdery mildew on flowers.

I. How powdery mildew on flowers develops: the pathogen overwinters as mycelium or conidia on diseased plant debris and diseased buds. In early spring, conidia spread via wind and rain, infecting leaves and new shoots. During the growing season, repeated infections can occur multiple times, with the disease being more severe from April to June and from September to October. High temperatures and dry conditions, excessive nitrogen fertilization, overly dense planting, insufficient sunlight or poor ventilation all favor the development of the disease. Resistance varies among varieties.

II. Control methods for powdery mildew on flowers:

1. In early spring, prune carefully, cutting out diseased branches and diseased leaves, and burn them promptly.

2. Apply more phosphorus and potassium fertilizer and limit nitrogen fertilizer.

3. Before bud break, spray with 3-4 degrees Baumé lime sulfur mixture, or Bordeaux mixture 1:2:100-200. In the early stage of the disease, spray Bijunsha at 800-1000 times dilution, 50% carbendazim wettable powder at 800-1000 times dilution, or 70% thiophanate-methyl at 1000 times dilution. When the disease is severe, spray Penkejun at 2000-3000 times dilution, which can quickly bring the condition under control.

① In early spring, prune carefully, cutting out diseased branches and diseased leaves, and burn them promptly.

② Apply more phosphorus and potassium fertilizer and limit nitrogen fertilizer.

③ In the early stage of the disease, spray 50% carbendazim wettable powder at 800-1000 times dilution, or 70% thiophanate-methyl at 1000 times dilution. Before bud break, spray with 3-4 degrees Baumé lime sulfur mixture, or Bordeaux mixture 1:2:100-200.