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Botrytis sp.

Mitosporic fungus. Hyphomycetes. Teleomorph (sexual state): Botryotinia (Ascomycete).

Botrytis microphoto



Primarily in temperate and subtropical regions.
Approx. 30 species.

Where Found

Soil, stored and transported fruit and vegetables. Plant pathogen and saprophyte on flowers, leaves, stems, fruit. Leaf rot on grapes, strawberries, lettuce, cabbage, onions.

Mode of Dissemination

Dry spore.
Also liberated by rain splash.

Growth Indoors

May be found in conjunction with indoor plants.
Aw=0.93-0.95 (minimum for various species).

Industrial Uses

None known.

Other Comments

Mostly parasitic on higher plants.
"Gray-mold," called "noble rot" on wine grapes.

Potential Health Effects


Type I allergies (hay fever, asthma).
Type III hypersensitivity pneumonitis: Winegrower's lung.

Potential Opportunist or Pathogen

Very rare agent of keratomycosis. No recorded human cases of infection.

Potential Toxin Production

None known.

Laboratory Notes

Growth/Culture Characterisics

Grows well on all general fungal media. Colony spreads easily over the surface of the petri dish. May form black sclerotia.

Spore Trap Recognition

Fairly distinctive, frequently with a visible inner cell wall, and an attachment point at one end. Spores are slightly pigmented.

Tape Lift Recognition

Distinctive, especially if spore bearing structures are present.