Basil Downy Mildew
Leaves problem · common pattern reported by gardeners · verify locally
What you'll see
- Yellow patches between veins
- Gray fuzz on undersides
- Leaves fall off
Most common causes
- Downy mildew fungus
- Cool humid nights
- Dense foliage
How to fix it
- Remove infected plants
- Improve air flow
- Avoid overhead water
Prevention: Resistant varieties (e.g. Amazel) Space plants well Water at soil level
More Basil problems
Grow Basil with confidence
Open the Basil growing guide → · Planting calendar · Pest & problem diagnoser
ZoneFig content reflects widely published extension-service and gardening guidance. Symptoms and causes are common patterns, not a diagnosis for any individual plant — verify locally and treat conservatively.