SUMMARYExperiments were made in 1957‐59 on the fungicidal control of club root in cauliflowers (summer and winter), brussels sprouts, summer cabbages and savoys. Plants were treated immediately before setting out or in their final position.Pure (100%) calomel used in suspension at 1 and 2 oz. per pint gave best control of the disease: the 4% calomel paste method was effective but treated plants suffered an initial check from which they only slowly recovered. Formulations of pentachloro‐nitrobenzene and of aldrin did not give satisfactory control.Several methods of applying metham‐sodium were tried but gave poor control of the di