Spatio‐temporal development of black rot ( X. campestris pv . campestris ) in cabbage in relation to initial inoculum levels in field plots in The Netherlands

The effects of initial inoculum levels on spatio‐temporal development in black rot of cabbage from artificial sources, one per plot, were evaluated in replicated field experiments. The results support the hypothesis that black rot is a polycyclic disease. Its development was inoculum‐dependent because the progress rate of epidemics and spatial spread were both positively correlated with the strength of the source. Fast disease development was related to the number of rain days. The spread of black rot, associated with the primary gradient, at first resulted from allo‐infection, later followed... Mehr ...