The first step is to identify the causative agent for the disease. Once a diagnosis of powdery mildew disease is made, the first attempts at control should always seek to minimize the impact to the surrounding environment. The following cultural control methods are recommended as the first steps to be taken in the attempt to control the disease.
- Use cultivars of plants that have known resistance to powdery mildew disease
- Avoid excessive nitrogen fertilization
- Avoid shade
- Avoid overcrowding
- Water early in the day
- Avoid irrigating the foliage of the plant (apply water to the base plant)
- Prune or replace plant materials to improve air circulation and sunlight penetration
- In fall, remove or destroy infected plants
- On indoor plants, reduce relative humidity
Chemical ControlOn some plants powdery mildew disease will occur, despite the best attempts at cultural control. Once all cultural control options have been exhausted without satisfactory results, chemical control methods can then be considered.
Foliar applications of fungicides (usually containing sulfur) Systemic fungicides Use a good spreader-sticker with fungicide Begin spray programs as soon as powdery mildew signs/ symptoms are seen (begin disease scouting early) Apply fungicides on a regular schedule, more often during cool, damp weather Always read the fungicide label and follow all precautions and recommendations Be a good steward of the environment. Act responsibly!
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