Alternaria leaf blight of carrot
Fungal disease of carrot attacking leaves. Occurs in warm, wet years, especially in the second half of the season.
Symptoms
- Dark spots on leaves
- Yellowing of foliage
- Leaf die-back
What it does to the crop
- Premature foliage die-back
- Smaller roots by 30-40%
- Poorer storage quality
What encourages it
- Warm, humid weather
- Plant debris
- Monoculture
Prevention
- Crop rotation 3-4 years
- Healthy seed material
- Debris removal
⚠️ 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 →