Filipendula rubra disease - Knowledgebase Question

Long Grove, Il
Question by djpochopien
June 30, 2010
I have wild type Filipendula rubra and the cultivar Filipendula rubra Venusta. Each Spring for the last three years my bed of the wild type gets to about 18

Answer from NGA
June 30, 2010


Sounds like the fungal disease called powdery mildew. Some plants are more susceptible to powdery mildew than others - as you've seen with your two types of Filipendula. The disease is difficult to control once it attacks plants. Powdery mildew fungi spread quickest when the humidity is high and temperatures are between 50F and 90F. To discourage the disease, plant on sites with good air drainage, give the plants plenty of space, water during the morning only, and allow the soil to dry out between waterings. Remove any affected leaves, and if your plant is heavily covered with powdery mildew you should probably remove the entire plant so the infection doesn't spread. For heavy infestations of powdery mildew, sulfur or copper sprays can be applied weekly, starting in May in your area. 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 Filipendula.

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