my roses - Knowledgebase Question

Question by ronilovesjes
April 30, 2010
my roses have a powder like substance on them . and hardly have any buds at all.what should i do ?

Answer from NGA
April 30, 2010


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 your roses are not producing many flower buds, it may be that your rose is not getting enough sunshine. Lack of sun will not only keep your rose from blooming but can also make it more susceptible to powdery mildew. 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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