Origin: in East Malling, England, by V.H. Knight and E. Keep, Hort. Res. Intl. Result of cross of an East Malling selection of complex parentage and a sibling of Glen Prosen, fourth backcross from the Cumberland black raspberry (Rubus occidentalis); cross made in 1976; tested as EM 4301/9; introd. in 1992. Plant varieties rights held jointly by NSA Plants, East Malling, and Hort. Res. Intl. Tree: high yielding; moderate number of long, fairly erect canes; canes moderately spiny; long laterals tend to droop but are well attached. Resistant to cane Botrytis, spur blight, and cane spot; moderately resistant to cane blight; susceptible to root rot; has gene A10 conferring resistance to the four known strains of the European aphid vector of the raspberry mosaic virus complex; susceptible to infection by pollen transmission of raspberry bushy dwarf virus. Fruit: large; uniform shape; moderately firm; medium red, slightly dull; easily removed from receptacle; midseason ripening; canned and frozen qualities superior to Glen Clova; produces good-flavored jam.
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