What is crown gall?

Crown gall is a disease caused by the bacterium Rhizobium radiobacter (synonym Agrobacterium tumefaciens), which enters the plant through wounds in roots or stems and stimulates the plant tissues to grow in a disorganised way, producing swollen galls. Galls are present all year.Crown gall affects many plants, both woody and herbaceous.

These are some of the plants on which it is found most commonly:

Fruit: Apples, cherries, currants, gooseberries, grapevines, blackberries, peaches, pears, plums and quince

Vegetables: Beetroot, courgettes, runner beans and swedes

Herbaceous plants: Alcea (hollyhock), Argyranthemum (marguerite), Begonia, Dahlia, Lathyrus (sweet pea), Lupinus (lupin) and Phlox

Woody plants: Crataegus (hawthorn), Euonymus, Populus (poplar), Salix (willow), Rosa and Ulmus (elm)

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