Varietal Resistance To 13 A2

Following the introduction of the A2 mating type of Phytophthora infestans into Europe in the late 1970s, new strains of late blight pathogen have subsequently developed in all countries. In GB since 2006, this culminated in a new genotype, 13_A2, dominating the GB population of P. infestans and this was widely reported to the industry.