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Gangrene

Phoma exigua var. foveta

Pathogen

Fungus

Hosts

Potatoes

Symptoms

Small dark `thumb print` depressions in the tuber skin. The rot inside the tuber is usually surrounded by a black / brown margin.

Development

The disease originates from inoculum on seed tubers, which subsequently infects the surrounding soil. Daughter tubers are infected through wounds caused during lifting. Rotting develops during storage at the wound sites and usually becomes apparent in December or January.

Favourable Factors

Dry, cold lifting conditions followed by cool storage. Tubers become more susceptible as they age.

Importance

Can result in serious storage losses.

Control

Identification and Management of potato diseases

Find out more information on the key disease threats to your potato crop. For each disease you will find out the importance of the disease in terms of potential yield penalty, how to identify the disease in its early stages and our advice on the best control strategies.

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