Diseases

Alternaria Leaf Spot of Savoy Cabbage

Brassica oleracea L. (Savoy Cabbage Group)

A fungal disease caused by the pathogens Alternaria brassicae, Alternaria brassicicola, and Alternaria raphani, manifesting as necrotic spots with sooty mold on leaves and heads.

In the reference 4 varieties crop Savoy cabbage, where this is mentioned in the description.

On seedlings, the disease manifests as black necrotic stripes and spots on cotyledons and hypocotyls, which leads to plant wilting. On mature specimens, dark zonate spots with a characteristic "sooty" spore coating appear; often a yellow halo forms around the spots, and the affected tissue in the center may fall out, giving the leaves a shot-hole appearance.

When wrapper leaves are affected, black spot disease develops, with the fungus capable of penetrating inside the head, reducing the market quality of the produce. Genetic resistance to the disease in Savoy cabbage is polygenic in nature, involving tolerance where selection criteria are based on the percentage of affected plants and the area of necrotic spots.

General information about the subject — on the page Alternaria blight.

Sources8

Varieties of Savoy cabbage mentioned in the description

Selection based on the description text, not on official evaluation: these data are absent from registers. For specific variety details, please refer to its profile.