Ascochyta blight

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Pest and pest injury identification
Arable crops
Faba bean
Ascochyta blight

Ascochyta blight on faba bean

Ascochyta blight on faba bean is caused by the fungus Ascochyta fabae.

Life cycle

Life cycle of ascophyta fabae on faba bean

Life cycle of Ascophyta fabae on Faba bean (Copyright Bernard TIVOLI, INRA).

Development of the symptoms

The disease is present in foci in the field, all the organs of the plant (leaves, stems, pods, seeds) show symptoms.

1.
Symptoms of ascochyta blight on young faba bean plants

Symptoms of ascochyta blight on young faba bean plants (Copyright Bernard TIVOLI, INRA)

The infection spots are few at the beginning, they look like burn marks and are often superior to 5 mm in diameter.

2.
Extension of the primary symptoms of ascochyta blight on faba bean leaf: anthocyanin edging, pycnidia on the central ash-gray area

Extension of the primary symptoms of ascochyta blight on faba bean leaf: anthocyanin edging, pycnidia on the central ash-gray area (Copyright Bernard TIVOLI, INRA).

Extension of the primary symptoms: anthocyanin edging, pycnidia on the central ash-gray area.

3.
Symptoms of ascochyta blight on faba bean leaves: appearance of dropping

Symptoms of ascochyta blight on faba bean leaves: appearance of dropping (Copyright Bernard TIVOLI, INRA).

Appearance of dropping linked to the production and the diffusion of fungi toxin.

4.
Symptoms of ascochyta blight on faba bean stems

Symptoms on the stem, making it break.

5.
Symptoms of ascochyta blight on faba bea pods

Symptoms on the pods: first round and ash-gray, then darker.

Modification date : 25 April 2023 | Publication date : 29 August 2013 | Redactor : Bernard TIVOLI (INRA)