Timing of inspections for foliar symptoms of Clavibacter michiganensis spp. sepedonicus
Studies have been carried out in United States on the onset and maximum incidence of foliar symptoms in potato caused by Clavibacter michiganensis spp. sepedonicus (EPPO A2 quarantine pest), in order to define the optimal timing of field inspections. Proportional hazard models have been used and predicted a minimum of 50 and 82 days after planting respectively, for symptom onset and maximum disease incidence. However, as environmental conditions (especially geographical location) so much influenced the time when these two events occur, the authors concluded that an environmentally based model should be useful for predicting expression of bacterial ring rot symptoms.
Sources
Westra, A.A.G.; Arneson, C.P.; Slack, S.A. (1994) Effect of interaction of inoculum dose, cultivar, and geographic location on the development of foliar symptoms of bacterial ring rot of potato.
Phytopathology, 84 (4), 410-415.