Causes of Powdery Mildew on African Violets

Powdery mildew thrives where conditions are warm and humid and air circulation is poor. Temperature fluctuations and low light can also contribute to fungal disease. Treating African violets with powdery mildew means taking precautions to avoid these conditions.

African Violet Fungal Control

If your African violets have powdery mildew fungus, you must first isolate affected plants to prevent the spread of disease. Remove dead plant parts too. Reduce humidity. Avoid overcrowding and provide adequate space around plants. Use a fan to circulate the air, especially when the air is damp, or temperatures are high. Keep plants where temperatures are as consistent as possible. Ideally, temperatures shouldn’t vary more than ten degrees. Sulfur dust is sometimes effective, but usually doesn’t help much unless it’s applied before the mildew appears. Water African violets carefully and avoid wetting the leaves. Remove blooms as soon as they fade. If powdery mildew on African violets doesn’t improve, try spraying the plants lightly with a mixture of 1 teaspoon (5 ml.) of baking soda in 1 quart (1 L.) of water. You can also spray the air around the plant with Lysol or another household disinfectant but be careful not to get too much spray on the leaves. You may need to dispose of badly affected plants that show no sign of improvement.

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