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Leaf mold (Fulvia fulva, syn Passalora fulva) develops mainly on leaves in the form of light green or yellow spots on upper leaf surfaces. As lesions mature, a green, velvet-like layer of sporulation can be visible on lower leaf surfaces. Affected leaves eventually die and drop from the plant. Wet conditions and high humidity (greater than 85% relative humidity) favor disease. Leaf mold is found primarily on greenhouse-grown tomatoes.     

Leaf mold on upper leaf.

(Photo: Rebecca A. Melanson, Mississippi State University Extension, Bugwood.org)

Leaf mold sporulation.

(Photo: Nicole Gauthier, University of Kentucky)

Management:

• Select resistant cultivars
• Provide adequate ventilation in structures
• Promptly remove and destroy diseased plant material
• Apply protectant fungicides beginning at fruit set

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