Vascular Wilts Lab Review

Vascular Wilts

Verticillium Wilt

Verticillium leaf symptoms

Leaf symptoms

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Vascular discoloration may appear greenish - grey

verticillium staining in stems

Vascular discoloration in cross sections of maple branches.

microsclerotia

Microsclerotia (dark round structures in micrograph) are formed by the fungus. These are masses of thick-walled mycelium that allow the fungus to survive long periods of adverse conditions.

microsclerotia Verticillium

A higher magnification view of the microsclerotia.

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Conidia are also produced. The conidiophores are whorled with conidia produced on the conidiophores. No sexual state is known.