Knowledgebase
What has caused the white spots on the leaves of my brassicas?
Posted by Dobies Staff on 18 December 2014 01:36 PM

White Blister is a widespread fungal disease that attacks plants in the brassica family including broccoli, brussels sprouts, cabbage, cauliflower, and related weeds such as shepherd's purse. The spores overwinter winter in the soil and can remain dormant for several months. The symptoms are small, smooth, white spots which later become powdery as the spores are produced, giving the appearance that white paint has been splashed on the leaves and stems. Affected areas or the whole plant becomes distorted.

There are no chemicals available for the control of white blister. Affected plants should be destroyed and not composted. Keep the area weed free and maintain a crop rotation of at least three years.

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