EPPO Global Database

EPPO Reporting Service no. 02 - 1993 Num. article: 1993/30

Symptom expression in Clavibacter michiganensis subsp. sepedonicus

Experiments were carried out in Colorado (US) in order to investigate the factors which affect symptom expression of Clavibacter michiganensis subsp. sepedonicus (EPPO A2 pest) in potato. Regression analyses of the bacterial ring rot symptom expression and environmental data showed, that as air and soil temperatures increase, the percentage of symptomatic plants increases and the length of the symptomless stage decreases. High solar radiation increased the number of symptomless days and low inoculum level infections favoured symptomless infections of potato.


Van Buren, A.M.; Harrison, M.D. (1992) Factors affecting symptom expression of bacterial ring rot in the field in Colorado.
Presentation at the 1992 APS/MPS Annual Meeting, Portland, OR, USA.
Phytopathology 82, 1161.