Gerbera Bud Blight After Powdery Mildew: Botrytis Control & Cultural Fixes

From Mildew to Bud Rot: A Fungal Progression

In India's climate (cool nights, warm days), powdery mildew on gerberas often leads to Botrytis cinerea (gray mold) infecting buds—brown, shriveled, blackened, dropping.

Chemical Options (If Not Organic)

Effective against Botrytis: chlorothalonil, copper hydroxide, copper sulfate pentahydrate, mancozeb. Rotate modes of action to prevent resistance. Follow label intervals.

Cultural Controls (Essential)

• Zero overhead watering – Drip only at base.
• Space plants – 12–18″ apart for airflow.
• Reduce humidity – Morning sun, good circulation; avoid dense shade.
• Sanitation – Remove & destroy (burn/trash) all infected buds/leaves. Do not compost.
• Rogue severely diseased plants – Pull and dispose entirely.

Organic Alternatives

Potassium bicarbonate sprays, neem oil, or Bacillus subtilis (Serenade) suppress Botrytis. Apply preventively in humid conditions.

Gerberas hate wet leaves and crowding. Fix the environment; fungicides are a backup.