Dusty looking leaves - Knowledgebase Question

laurel run, Pe
Question by helensj
September 11, 2010
I have several peony plants and 1 azalea. The leaves on these are dusty looking and pale green. They asre not flourishing. What can I do?


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Answer from NGA
September 11, 2010

0

 What you describe sounds like a fungal disease called powdery mildew. To reduce additional infections, avoid overhead watering to help reduce the relative humidity. Remove and destroy all infected plant parts (leaves, etc.). Selectively prune overcrowded plant material to help increase air circulation. This helps reduce relative humidity and infection. If cultural controls fail to prevent disease buildup, or if the disease pressure is too great, an application of a fungicide may be necessary. These include: sulfur, neem oil (Rose Defense, Shield-All, Triact), triforine (Ortho Funginex), or potassium bicarbonate (Kaligreen, First Step) Chemicals are most effective when combined with cultural controls. Best wishes with your landscape!

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