Tomato Leaf Mold
Passalora fulva (Cladosporium fulvum)
Fungus
Leaves
Overview
A fungal disease primarily affecting greenhouse tomatoes, causing olive-green to brown velvety patches on leaf undersides with corresponding yellow spots on upper surfaces.
Symptoms
Pale yellow spots on upper leaf surfaces. Olive-green to brown velvety mold on corresponding leaf undersides. Leaves curl, wither, and drop. Rarely affects fruit. Most severe in humid greenhouse conditions.
Environmental Conditions
Humid
Prevention
Ensure good ventilation in greenhouses. Reduce humidity. Plant resistant varieties. Avoid overhead watering. Space plants for air circulation. Remove lower leaves.
Management
Improve ventilation and reduce humidity. Remove infected leaves. Apply copper or chlorothalonil fungicides. Resistant varieties are the best long-term solution.