Alternaria brassicicola

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Alternaria brassicicola symptoms on cabbage (click on image to enlarge it)
Author(s): Elizabeth Bush, Virginia Polytechnic Institute and State University
Source: IPM Images

Alternaria brassicicola (Schwein.) Wiltshire 1947 - (Alternaria black spot)

The fungus is widely distributed and causes serious leaf and pod diseases on Brassica species. The fungus enters the plant through small wounds or stomata. It may also be seedborne. The first signs are brown to black spots on leaves, stems and pods which enlarge, causing defoliation. Leaf spots often show a pattern of concentric rings. The fungus can survive between growing seasons in plant debris and disperses through the air or with rain splashes. The conidia are club-shaped, dark brown, multi-celled and usually tapering to a beak. They are around 20-130 µm long and 10-20 µm wide.

See also Alternaria brassicae which causes similar diseases. In comparison, Alternaria brassicicola perfers warmer temperatures and the conidia are clearly smaller.

Vernacular names
• Deutsch: Kohlschwärze
• English: Alternaria black spot
black spot of crucifers

Synonyms:
Alternaria circinans