R gene polyculture [20] is a colony that is uniform in all agronomic traits but recognition specificities
to P. infestans. R-gene polyculture is proposed to give more durable resistance for three reasons[23].
Firstly, any pathogen race that can overcome only one R gene will give rise to much slower epidemic.
Secondly, any such pathogen race that undergoes an additional mutation to overcome another R gene is
likely to be less fit than a race that can overcome only one R gene, because avr gene are likely to encode
pathogenicity factors.