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Diseases

Alternaria Leaf Blight of Carrot

Daucus carota L.

A complex of carrot diseases caused by the fungi Alternaria dauci (leaf blight) and Alternaria radicina (black rot), characterized by polygenic resistance and the need for pathogen differentiation in breeding.

In the reference 185 varieties crop Carrot, where this is mentioned in the description.

The causal agent of leaf blight, Alternaria dauci, infects carrot foliage, manifesting as dark brown or black necrotic spots with a chlorotic halo, which, under high humidity, leads to mass leaf dieback. Alternaria radicina is the causal agent of black rot, which affects seedlings in the manner of damping-off and forms deep, dark, sunken lesions on root crops during storage.

Carrot resistance to this pathocomplex is polygenic in nature, with the term tolerance being more frequently used in breeding to account for the influence of interallelic interactions and environmental factors. In professional documentation, codes Ad for Alternaria dauci and Ar for Alternaria radicina are used to denote resistance to the pathogens, although there is no clear classification into pathogen races.

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

Sources8

Varieties of Carrot 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.