What Is It? | Facts in Depth | For the Professional Diagnostician
Botrytis Gray Mold
- Infected leaves are brown with blighted areas. On tomatoes lesions are often V-shaped on leaves.
Images of Botrytis gray mold symptoms on tomato leaves (left) and lettuce leaves (right).
- Grey-brown velvety mold spots on the leaves or stems.
- Stem cankers can damage or girdle the stem and lead to wilting.
Symptoms of Botrytis gray mold on tomato seedlings (left) and plants (right).
- Flowers may turn brown and die.
- Flowers and fruits develop a grey, fuzzy coating.
- Fruits develop necrotic flecks surrounded by a whitish halo or white circular rings.
- Infected fruits turn gray-white and rot.
Favorable Environmental Conditions
- Cool and wet (high humidity >80%) conditions.
- Moderate temperatures of 65 – 75°F.
Often Confused With
- Sclerotinia white mold
- Rhizopus rot
- First sites of infection are wounded tissues and fading flowers.
- Initial growth appears white, and then darkens to a grey color.