Resistance to powdery scab inSolanum tuberosum L.

Summary

Seedlings and named varieties of potatoes were planted in five-hill lots in soil infested with the powdery scab organism. Over a three year period, the incidence of powdery scab varied considerably. In all three years, however, the Kennebec variety, used as a check, showed considerable infection indicating it to be very susceptible to this disease. The data suggest that resistance or susceptibility to this disease is a matter of degree. Although it cannot be said that any of the seedlings or named varieties tested are especially resistant to powdery scab, most of them proved to be less susceptible than the Kennebec variety.