Abstract
A major dominant resistance gene Sph3 has been transferred from Ribes ‘carrierei’ (R. glutinosum albidum × R. nigrum) to black currants of commercial promise by backcrossing repeatedly to R.nigrum. Probable causes of the almost invariable deficit of resistant plants in segregating progenies are briefly discussed. Response of young seedlings to mildew in the glasshouse was very highly correlated with their field response as mature plants.
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