Didymella pinodes

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Didymella pinodes part of fruiting body in pea plant - asci with ascospores (click on image to enlarge it)
Author(s): Bruce Watt, University of Maine
Source: IPM Images

Didymella pinodes (Berk. & A. Bloxam) Petr. 1924

The fungus is wide-spread and causes ascochyta blight, a serious disease of peas. It also infects some other legumes. Initial symptoms are small purple spots on the undersides of leaves. They enlarge and become well-defined, brown- black lesions, sometimes blighting the whole leaf. Stems, flowers and pods are also affected. The infections result in stunting or plant death, in severe cases. Yield losses can reach 50% under cool and wet conditions.

Management options include crop rotation, the use of resistant cultivars and fungicides (e.g. as seed treatment). In outbreak areas, it is recommended to grow peas only once every 3-4 years.

Vernacular names
• Deutsch: Blattbrand der Erbse
• English: ascochyta blight of pea
leaf blight of pea
• Español: antracnosis del guisante
• Français: brûlure ascochitique

See also Ascochyta pisi which causes a similar disease.

Synonyms:
Ascochyta pinodes
Mycosphaerella pinodes
Peyronellaea pinodes