EPPO Global Database

EPPO Reporting Service no. 11 - 1992 Num. article: 1992/07

Yield reduction of tomatoes caused by Clavibacter michiganensis subsp. michiganensis

Investigations were conducted in Illinois, US, to assess the yield reductions of processing tomatoes due to the infection by Clavibacter michiganensis subsp. michiganensis (EPPO A2 organism).
Seedlings were systematically infected during clipping or seedling harvest and the yield reduction and the disease incidence were monitored. The results showed that the average fruit weight decreased by 13 g and the maximum yield up to 46% when the incidence of infection was 31-83%. A linear regression indicated that for each 10% disease increase the yield was reduced by 5-7%.


Chang, R.J.; Ries, S.M.; Pataky, J.K.  (1992) Reduction of yield of processing tomatoes and incidence of bacterial canker.
Plant Disease 76, 805-809.