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Scab

Pathogen

Fungus

Hosts

Carrots

Symptoms

Horizontal blackened, corky lesions on the root surface which can be either raised or sunken. These can arise in areas where lateral roots develop or where roots are punctured. There are no visible symptoms on plant leaves. Can also be a problem on other root crops such as potatoes, swedes, turnips, radish and beetroot.

Development

An organism related to bacteria but like fungi produces mycelium which can invade roots. The scabs produce spores which exist as part of the soil microflora.

Favourable factors

Hot, dry summers on light sandy alkaline soils.

Importance

Does not adversely affect crop yield but does impact on quality and marketability.

Control

Identification and Management of carrot diseases

Find out more information on the key disease threats to your carrot 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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