Liliac Bush - Knowledgebase Question

Question by pzieris328
June 30, 2010
I have a lilac bush, 3rd year, 1st 2 had a white fungus, replanted higher with better drainage and that is gone. It did have 4 flowers this year, howver, there is nothing growing on branches I had to cut. Do you suggest cutting the untire bush to bottom?

Answer from NGA
June 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 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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