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Common Plant Diseases

Powdery Mildew.
First appears as small white spots on the tops of the leaves, but then progresses a fine, pale gray-white powder, all over. Growth slows, leaves turn yellow and the plant dies. Powdery mildew is caused by cool temps, dim light and high humidity. How to treat this common plant disease?

Decrease humidity
Increase air circulation and ventilation
Increase light intensity
Consider using Safer's 3 in 1 Garden Spray.