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Name of the fungus

Description of the symptoms

Example

Alternaria brassicae

Dark spots (diameter +/- 0,5 cm) showing circular zones of alternate light brown and dark brown colour. They are often surrounded by a halo of chlorotic tissue.

Leptosphaeria maculans

Ash-gray to beige spots, sometimes with an edge limited by a thin black margin. The black, well-delimited dots (pycnidia) are characteristic of L. maculans and visible to the naked eye. Old spots have a hole in the centre.

Leptosphaeria biglobosa

The spots are often darker than the ones caused by L. maculans. There is a small round spot in the centre, very often with a hole. A chlorotic halo is often visible. The pycnidia are small and barely visible to the naked eye.

Pseudocercosporella capsellae

Beige, paper-like spot. A more or less marked chlorotic halo is often visible.
 The spots can be uniformly beige or covered with irregular black dots (not to be confounded with pycnidia).

Pyrenopeziza brassicae

Beige, necrotic, paper-like spot. It is surrounded by small white films (acervula liberating the conidia) arranged in concentric circles around the necrotic tissues.

Mycosphaerella brassicicola

Black spot with a high density of black dots. A chlorotic halo is often visible.