Breeding for Root Rot Resistance in Red Raspberry1

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Abstract
Red raspberry (Rubus idaeus L.) clones and seedlings were evaluated in infested field soils for resistance to a root rot. Disease symptoms were root necrosis and wilting of first and second year canes. Of 41 clones examined ‘Latham’, ‘Newburgh’, ‘Durham’, ‘Chief’ and ‘WSU 458’ were the most resistant. ‘Lloyd George’ and its derivatives were generally the most susceptible. Evaluation of seedlings from 25 crosses showed that ‘Latham’ and ‘Newburgh’ produced the highest percentage of resistant seedlings and the seedlings with the highest level of resistance; ‘Glen Clova’ and ‘Meeker’ produced the fewest seedlings with resistance. Heritability estimates based on parent/offspring regression were 0.85 for the percentage of seedlings infected and 0.92 for the mean seedling injury rating.

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