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The character of gene interaction determining resistance to fungal diseases and gall mite was investigated by topcrossing method in black currant cultivars and forms of different genetic nature. For crossings three maternal varieties (testers) and seven paternal varieties and forms of different resistance to American mildew, Septoria leaf spot and gall mite were employed. Eleven cultivars and forms were assessed that differed in combining ability of resistance to fungal diseases and gall mite.doi:10.17221/10565-pps fatcat:4t6zynhejrhorln3bbtiqt5pxy