Potential link between Blackleg and Free Living Nematodes
Pratylenchus which can do direct damage to roots. “In Norway anecdotal evidence has been found of an association between Pratylenchus and common scab caused by Streptomyces scabies. “It appears in the lesions caused by the scab, but we do not know whether it is a cause or an effect.” Other work in North America suggests that the nematode creates wounds when feeding on the roots, opening a way for Verticillium to enter. [Identification and distribution of root lesion nematodes] Roy said:...
Source: ahdb.org.uk