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Clubroot testing service


Clubroot (Plasmodiophora brassicae) is a disease affecting vegetable Brassicas and oilseed rape. Typical symptoms are galls formed on roots affecting water and nutrient uptake. Plants are stunted, often wilt in dry conditions or can die off completely. The pathogen multiplies in the galls and long-lasting resting spores are released to the soil. These spores can survive in soils for more than 15 years. In oilseed rape, resistant varieties exist, but resistance has broken down in large areas of the UK and cannot be relied on any longer.

Lengthening rotations is the only means to control clubroot sustainably and information on pathogen levels in soils aid rotational planning. PGRO is offering a test to quantify clubroot spore numbers in soils. The test had originally been developed by the University of Worcester, who provided a risk table.


PGRO has been offering the test since 2016 and has received feedback from Richard Dungait, a swedes grower who has been using the test for the last three years. In his experience, if a field has 5,000 or less spores per gram soil, galls are very rarely formed. Counts between 5,000 and 20,000 spores per gram soil in large fields may reflect hot spots of clubroot but in smaller fields can lead to formation of galls. Richard would recommend avoiding growing swedes on land with more than 10,000 spores per gram soil and in a rotation of one in six years maximum.

Please call or contact us if you have a Clubroot testing requirement.