Preventing Harmful Cauliflower Diseases Preventing Harmful Cauliflower Diseases

Cauliflower plants can develop a range of diseases, such as blackrot, black leg, cauliflower mosaic virus, and mildew. Leaf spot is caused by a fungal infection, and is spread by spores; clubroot, another fungal infection, results in stunting. Downy mildew is another common problem, and this develops on the cauliflower after harvesting—recent resistant strains have been developed. Bacterial, or black rot, affects cauliflowers seriously.

Preventing Diseases

Crop rotation is vital to preventing the common diseases of cauliflower plants; for the best chance at avoiding re-infection through rotation, it is vital to avoid growing any of the cauliflower’s relations, such as Brussels sprouts, cabbage, broccoli and kale. Keep the cauliflower and its relations away from any area that has been used to grow cauliflowers in the last three years.

Bacterial rot may be prevented by avoiding damage to the cauliflower, and storing in cool areas. Seeds may also be treated with hot water to kill black rot, and other bacterial infections. Hot water treatment may limit germination, but this can be solved by sowing extra seeds.

It is also possible to buy a range of disease resistance varieties, which can help if you are having a particular problem with a disease. Liming the soil of the ground can assist in preventing fungal infections.


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