Abstract
The inheritance of root rot resistance in red raspberry, caused by Phytophtora fragariae var. rubi, was investigated using two experimental breeding designs. Design A was not randomly mated and genetic parameters could not be calculated. Design B was therefore randomly mated to make it possible to do such estimations. Considerable genetic variation was associated with the recorded traits on seedlings tested in a glasshouse. Disease index and % survival were both found to be highly heritable with broad sense heritabilities (H2) close to 0.9 in each design. Estimates of narrow sense heritability (h2), indicated that progress towards resistance would be moderate. In the first design the cultivars ‘Festival’, ‘Asker’, ‘Boyne’ and ‘Sentry’ and the clones N85-02-13 and N85-06-140 had high general combining abilities. Some crosses had a high specific combining ability indicating the presence of non-additive genetic variation.
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