Fruit and vegetable diseases

Page last updated: Friday, 2 February 2018 - 12:07pm

Please note: This content may be out of date and is currently under review.

This web article describes the most common diseases of vegetables in home gardens.

Home gardeners frequently see diseases affecting their vegetables. Usually they would have seen them in previous seasons, and the symptoms look familiar.

Unfamiliar diseases could cause significant problems for our primary industries and environment if they were to become established in Western Australia.

So if you see an unusual disease please contact the Pest and Disease Information Service (PaDIS) on 1800 084 881 or

Diseases caused by fungi and bacteria

Bacterial speck

Bacterial speck is a bacterial disease and results in small, black spots on leaves, stems and fruits of tomatoes, at all stages of growth. It is most common from winter to mid spring. Copper hydroxide may give some control.


Clubroot is a fungus disease that only affects Brassicas (the broccoli family). Plants are yellowish and stunted, with large malformed ‘clubbed’ roots. Clubroot may be severe in warm weather. Avoid growing brassicas in the same area for four years and lime the soil if it is acidic.

Roots of a broccoli plant affected by the disease clubroot.  The white roots are swollen, twisted and unable to adequately take up water and nutrients.


Contact information

Pest and Disease Information Service (PaDIS)
+61 (0)8 9368 3080