This bacterium is commonly found in the soil and can survive for years on dead organic material. If the bacterium has invaded through wounds, it triggers unlimited cell division in the cells of the plant, which causes tissue proliferation. The bacterium alters the cells so that they produce food for the bacterium. The presence of the bacteria in the plant does not necessarily lead to the development of tumors (latent presence).


The bacterium causes tuberous growths on the plant. These can be visible on roots, areas where grafting has taken place, stem parts, leaves or the petioles of the plants, and can cause growth inhibition.


The bacterium needs a wound to enter the plant. Wounds can be caused by nematodes, insects, vegetative propagation, harvesting or crop operations. Rapid spread occurs in the plant itself. However, the bacterium has also been known to spread in water. Spread of the bacterium and infection of plants through watering should therefore not be excluded.

Crops: Rose, Tomato, Chrysanthemum and other crops

Species: Agrobacterium tumefaciens