How to test soil for clubroot

July 31, 2019 - Issue 18

The easiest way to test for clubroot is to dig up plants and check for galls. If you want to check fields for the presence of clubroot DNA before you see visual symptoms, you can try a random soil test. Labs that test soil for clubroot DNA are listed here. These labs can detect spores at levels of 1,000 per gram, which is considered fairly low risk for the development of galls. These early-stage results give farmers a chance to introduce clubroot risk management steps.

How to take a proper soil test for clubroot analysis. Obtain approximately two to three cups of soil for this test. This should be a composite sample taken in a “W” pattern near the major approach or entrance to the field, or other high clubroot risk areas in the field. Sample soil from the top 5 to 10 cm (A horizon), excluding as much surface organic matter as possible. Saskatchewan Ministry of Agriculture has two helpful factsheets: Clubroot soil sampling on the Prairies. Interpreting a clubroot soil test result.

Participate in the Saskatchewan Clubroot Survey. Farmers who invest in SaskCanola can submit a voluntary sample from their field for complimentary testing. For a sampling kit, please contact SaskCanola at 306-975-0262 or to get one mailed or stop by any Ministry of Agriculture Regional Office. If you are hosting an upcoming field day in Saskatchewan and would like a SaskCanola representative to attend to talk about clubroot and the provincial survey, please contact SaskCanola using the contacts above.

Manitoba Canola Growers can get a free test from PSI Lab.

Sanitation when scouting. When scouting for clubroot, make sure to clean boots and tools before moving to the next field. Bleach is the best product for boot baths, hand tool cleaning and washing quad wheels, but it’s not the only product that works. Read more.

Watch the new clubroot management video.

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