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Botrytis occurs on all kinds of dead and dying plants and crop debris.  Affected tissues rot and become covered with a grey furry mass, especially in wet conditions.  It usually starts by attacking andy damaged tissue, but later it can attack undamaged tissue for example where petals fall onto a green leaf, botrytis initially attacks the petal, then attacks the green leaf.  Botrytis can also attack via damage caused by frost and fertiliser scorch.  Stem lesions can also form, especially where stems have become damaged by cabbage seed weevil, or where petals have become trapped by a petiole.  The fungus can attack pods late in the season, causing splitting, or internal infection of the seed.

Photo: Rasbak Wikimedia commons (CC BY-SA 3.0)
Photo: Rasbak Wikimedia commons (CC BY-SA 3.0)

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