What has caused the yellow spots on my brassica plants?
Posted by Dobies Staff on 14 November 2014 09:52 am

Brassica Downy Mildew is a common fungal disease and can be found on Alyssum, Cabbage, Cauliflowers, Brussels Sprouts, Horseradish, Radish, Stocks, Swedes, Turnips, Wallflowers and Watercress.

The disease is usually found on seedlings and young plants, although plants at all stages can be attacked. It is more of a problem in mild, damp weather or humid conditions. The spores can be soil borne or wind distributed.

Yellow patches form on the upper leaf surface with corresponding greyish - white fungal growth on the underside. The leaves are often blistered around the patches. In severe attacks the leaves turn yellow and die. There may be pale brown colouration of cauliflower curds and black streaks or spots on the stem.

Improve air circulation by ventilating the greenhouse or frame where the young plants are being raised, and by spacing the plants further apart. Remove affected leaves as soon as they are seen. There are no chemicals available for the control of this disease.


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