SUMMARYField and insectary tests confirmed that the black‐currant gall mite (Cecidophyopsis ribis) is unable to survive on gooseberry and red currant.A dominant gene Ce, controlling resistance to the gall mite, has been transferred from gooseberry to black currant. Resistant, large‐fruited, self‐fertile black currants of commercial potential have been obtained in the third backcross.One accession of Ribes bracteosum and three of R. americanum proved field susceptible to the gall mite, but twenty‐four accessions of other Ribes species remained free from galled buds for at least 3 years in an infection plot.
Strong resistance to the cane diseases Elsinoe veneta, Did vmella applanata and Botrvtis cinerea, and to Sphaerotheca macularis, occurred in Fi and BC, derivatives of an accession of Rubus coreanus . Resistance to cane spot (E. veneta) was polygenic .In eight out of ten BC, progenies, average grades for cane spot infections were significantly higher in white-flowered (an,) than pink-flowered (Ani) plants and in hairy-caned (H) than in glabrous (h) seedlings . It is postulated that in . R . coreanus factors controlling resistance are linked with An, and . probably, with h .Average grades for spur blight (D . applanata) were significantly higher in white-flowered plants in nine out of ten BC1 progenies . Spininess (S) was associated with greater susceptibility in six out of eight BC, families, although this difference was not statistically significant .Plants with the phenotype hAn i on average provided the best source of resistance to both cane spot and spur blight .
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