A group of oilseed rape diseases including root rot, which manifests during overwintering, and black rot, which affects the leaf apparatus and is characterized by high race variability of the pathogen.
In the reference
21
varieties
crop Rapeseed,
where this is mentioned in the description.
Root rot is caused by a complex of bacteria, Xanthomonas campestris and Pseudomonas fluorescens var. napi. In autumn, the disease progresses latently, with the formation of cavities and browning of the root core in the root collar area. In the spring, the affected tissues become shredded and mucilaginous, leading to the easy detachment of the leaf rosette from the root system.
Black rot is caused by the pathovar Xanthomonas campestris pv. campestris and manifests as V-shaped chlorotic necroses starting from the leaf margins, followed by the blackening of the vascular bundles. The pathogen possesses significant genetic variability, including numerous physiological races, which complicates breeding for immunity. Resistance in cultivars is determined primarily through screening, as the search for resistance to a broad spectrum of races is based on identifying QTLs rather than utilizing tagged major genes.
Varieties of Rapeseed mentioned in the description
Selection based on the description text, not on official evaluation: these data are absent from registers. For specific variety details, please refer to its profile.