symptoms
Symptoms
- circleBrown spots with concentric rings (target pattern)
- circleYellow halos around spots
- circleLower leaves affected first
help
Causes
Caused by Alternaria solani. Spreads in warm, wet weather.
healing
Treatment
Remove infected leaves. Apply copper or chlorothalonil fungicide.
shield
Prevention
Crop rotation. Resistant varieties. Mulch to prevent soil splash.