The puzzle of nonhost resistance: why do pathogens harm some plants but not others?

IMAGE: Ralph Panstruga & Matthew Moscou view more  Credit: Ralph Panstruga & Matthew Moscou People have puzzled for years why pathogen Phytophthora infestens causes the devastating late blight disease, source of the Irish Potato famine, on potatoes, but has no effect at all on plants like apple or cucumber. How are apple trees and cucumber plants […]