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Powdery mildew of pumpkin

Common fungal disease of pumpkin. Appears regularly in the second half of the season, especially in August and September.

Symptom photos

Powdery mildew of pumpkin — Leaf covered in white, powdery growth next to a healthy leaf — Leaf covered in white, powdery growth next to a healthy leaf Photo: Schlaghecken Josef, licence CC BY-SA 4.0

Symptoms

White powdery coating on leaves
Leaf yellowing
Leaf die-back

What it does to the crop

Premature leaf die-back
Smaller fruits
Poorer storage quality

What encourages it

Warm, dry weather
Humid nights
End of summer

Prevention

Resistant varieties
Avoiding overcrowding
Removal of infected leaves

⚠️ Before you reach for a spray

This atlas is informational and still growing — different diseases can look almost identical. Confirm the diagnosis and read the product label before applying any plant protection product. If you are unsure, ask your local extension or advisory service.

Keep the disease atlas with you in the garden

In the app you can identify a disease from photos, work out the spray dose for your own bed and log the treatment in your task calendar. Free, no sign-up, works offline.

Open the atlas in the app →

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