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Three potato (Solanum tuberosum) cultivars differing in susceptibility to potato leafroll virus (PLRV)-Russet Burbank (highly susceptible), Kennebec (moderately resistant), and Cascade (resistant)-showed increasing resistnace to PRLV in the field as plants aged. As inoculation age (measured in days after plant emergence) increased, percent tuber infection decreased significantly (P<0.05) in each cultivar. As inoculation pressure (measured by viruliferous aphid-days) increased, percent tuber infection per plant increased significantly for Russet Burbank and Cascade
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Christina DiFonzo (1994) studied this question.
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