Bacterial ring rot

from Wikipedia, the free encyclopedia

The bacterial ring rot is caused by the bacterium Clavibacter michiganensis ssp. sepedonicus- induced potato disease .

Typical of the disease, which also occurs in Germany in some regions, is a disturbed tissue function in the area of ​​the vascular ring of the tuber .

Damage

The bacterial ring rot can be recognized in the longitudinal section by an initially creamy yellow to slightly brown discoloration of the vascular bundle zone. If the infestation is severe, the entire ring of vascular bundles is broken down. Infested plants sometimes show visible signs of infection from July onwards . The diseased perennials turn slightly yellow. The leaves roll up around the midrib and eventually dry up. Bacterial ring rot causes crop losses of up to 20% due to emergence damage, while losses of up to 60% have been determined during storage.

Combat

Measures to combat this dangerous potato disease are currently only possible through plant hygiene (using healthy seedlings) and observing the quarantine regulations. Due to the current potato protection ordinance , every potato grower is obliged to report suspected cases to the responsible authority (e.g. the plant protection office ). By inserting §6 into the national seed potato regulation (of June 30, 1981) it was ensured that the control of bacterial ring rot also takes place with the help of the seed traffic law .