stop powdery mildew from my rose - Knowledgebase Question

Name: Elena Caballero
Glendale, Ca
Question by elenaintimoo
April 25, 2010
How can I stop powdery mildew from my beautiful rose?

Answer from NGA
April 25, 2010


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 roses!

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