bumps on cabbage roots

Club root of cruciferous vegetables. Gerald Holmes, Strawberry Center, Cal Poly San Luis Obispo, Bugwood.org

Updated: April 20, 2021

Bumps on roots

Clubroot is a soil-borne fungal disease that causes the yellowing, stunting, and wilting of cruciferous plants, especially cabbage. The clubroot diagnosis is confirmed by the presence of club-like galls (swellings) on infected plant roots. (resistant vs. susceptible) The disease is worse in acidic soils.

varying degree of club root on turnip roots
Clubbed roots of four turnip plants showing variation in symptom
Gerald Holmes, Strawberry Center, Cal Poly San Luis Obispo, Bugwood.org

Management

Remove weeds from the garden area and borders, rotate crops, clean up and discard all plant debris at the end of the season and incorporate 3.5 lbs. of hydrated lime per 100 sq. ft. of garden area prior to planting to maintain a soil pH of 7.2-7.4.

cabbage plant resistant to club root next to an infected plant
Resistant vs. susceptible cabbage varieties
Photo: C McClurg