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Clubroot - Brassicas

Plasmodiophora brassicae

Pathogen

Fungus

Hosts

Field brassica crops, all cultivated brassicas, oilseed rape as well as cruciferous weeds such as shepherds purse and charlock.

Symptoms

Patches within the crop wilt, exhibit stunted growth and have swollen, misshapen roots which decay by rotting.

Development

Resting spores of the fungus can survive in the soil for up to 20 years and infect cruciferous crops and weeds through the root hairs. The fungus then stimulates root cell multiplication and produces spores which reinfest the soil during root decay.

Favourable Factors

Cool, wet weather.

Importance

Clubroot is a serious and destructive disease of all brassica crops and oilseed rape. Affects all cultivated brassicas as well as cruciferous weeds such as shepherd`s purse and charlock. Resistant horticultural varieties are available to commonly occurring races of clubroot but in the presence of inoculum plants will still produce small restricted galls. There are reports of more aggressive races of clubroot from both Europe and the UK.

Control

Identification and Management of field brassica diseases

Find out more information on the key disease threats to your field brassica 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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