Evaluation location: Wisconsin, United States
METHOD: Visual Examination CONDITIONS: Green House METHOD NARR: Comparisons were made of susceptible and resistance plants both in the field and in the GH. Representative results are given from the GH studies. An estimate of percent leaf infection by P. infestans was recorded. Infection rating of 0-9 as 5 day/8 day/12 day with 9 = no visible infection, 8 = <10%, 7 = 11-25%, 6 = 26-40%, 5 = 41-60%, 4 = 61-70%, 3 = 71-80%, 2 = 81-90%, 1 = >90%, 0 = 100%. RESULTS NARR: The hybrids generated were resistant to late blight. AUTHOR EXPLANATION: In addition to the parents, somatic hybrids were tested for resistance and characterized using RFLP and RAPD protocols. Resistance to P. infestans from blb seems to be more general than the race-specific resistance derived from dms.