Powdery Mildew
Erysiphe spp. / Podosphaera spp.
moderate risk
plant_disease
Overview
One of the most common fungal plant diseases. Appears as white powdery coating on leaves. Affects hundreds of plant species.
White to gray powdery or dusty coating on leaves, stems, and sometimes fruit. Starts in spots then spreads.
Prevention Strategies
- •Plant resistant varieties
- •Improve air circulation with proper spacing
- •Avoid overhead watering
- •Plant in full sun
- •Avoid excess nitrogen fertilization
Control Methods
- •Potassium bicarbonate spray
- •Neem oil spray
- •Sulfur fungicide
- •Copper fungicide
- •Remove and dispose of infected plant material
Interesting Facts
- •Each species of powdery mildew typically infects only specific host plants
- •Unlike most fungi, powdery mildew can infect plants in dry conditions
- •A mixture of baking soda and water is an effective home remedy
- •Resistant varieties are the best long-term solution