EPPO Global Database

EPPO Reporting Service no. 02 - 1993 Num. article: 1993/29

Antagonistic bacteria to Clavibacter michiganensis subsp. sepedonicus

In Canada, experiments were conducted in order to isolate antagonistic bacteria to Clavibacter michiganensis subsp. sepedonicus (EPPO A2 pest) and to test their efficiency against ring rot of potato in field experiments.

Three isolates were found which gave a complete control during the first 2-3 weeks of plant growth in field experiments. The inoculation of potatoes with any of the three antagonists increased the plant stand by at least 50%. One antagonist, an isolate of Arthrobacter protophormiae proved especially successful and significantly reduced the number of plants and tubers with symptomatic or symptomless ring rot infections.


Gamard, P.; De Boer, S.H. (1992) Effect of natural occurring antagonistic bacteria on the bacterial ring rot disease of potato.
Presentation at the 1992 APS/MPS Annual Meeting, Portland, OR, USA. Phytopathology 82, 1108.