Gray mold – Vegetable Crops Hotline

Gray mold

gray mold botrytis

Figure 1. The fungus that causes gray mold often sporulates on infected tomato stems.

Botrytis gray mold on stem

Figure 2. Gray mold on infected tomato stem.

gray mold lesions on leaf

Figure 3. Gray mold lesions on leaves are oftne light brown or gray, often on the edge of the leaf and may show a ring-structure. Note sporulation of fungus observed in the crack of the lesion.

gray mold on fruit

Figure 4. Gray mold of tomato fruit. Note sporulation of fungus.

Leaf with gray mold

Figure 5. Gray mold lesion on tomato leaf.

tomato fruit gray mold

Figure 6. Gray mold on tomato fruit.

leaf petiole grey mold

Figure 7. Gray mold on tomato leaf petiole.

gray mold wedge

Figure 8. Gray mold on leaf lesion on margin of tomato leaf. Note sporulation.

blossom and gray mold

Figure 9. Tomato flower blossom with gray mold sporulation appears to have fallen on leaf where a new lesion has started.

ghost lesions

Figure 10. Conidia of the gray mold fungus fall onto tomato fruit where they may induce the reaction shown here resulting in a ‘ghost lesion’. While the lesions will not expand, the appearance may reduce marketability.

rings of grey mold

Figure 11. Lesion of gray mold on tomato leaf. Note ring structure.

grey mold on green tomato

Figure 12. Gray mold on green tomato fruit.


Vegetable Crops Hotline - Horticulture & Landscape Architecture, 625 Agriculture Mall, West Lafayette, IN 47907

© 2024 Purdue University | An equal access/equal opportunity university | Copyright Complaints | Maintained by Vegetable Crops Hotline

If you have trouble accessing this page because of a disability, please contact Vegetable Crops Hotline at | Accessibility Resources