PRO/PL> Blackleg, oilseed rape – UK: host resistance break down

Other Plant Disease — United Kingdom
Oilseed rape [osr] growers could suffer substantial losses after a study revealed an important source of genetic resistance against phoma stem canker is becoming less effective. Researchers from the University of Hertfordshire have declared that host resistant gene Rlm7 has become less successful in controlling stem canker.
The disease is caused by 2 closely related fungal pathogens, _Leptosphaeria maculans_ and _L. biglobosa_ [see comments below], with Rlm7 the most dominant gene to give