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Eleven day-neutral strawberry cultivars were released by the University of California between 1979 and 1990. All were derived from a 1955 hybrid between `Shasta' and a staminate  Fragaria virginiana  glauca clone from the Wasatch Mountains near Salt Lake City, Utah. The first backcrosses to standard cultivars were made in 1958. the second in 1965 and the third in 1969-70. The first three releases came from the third backcross generation in 1979; `Aptos', `Brighton' and `Hecker'. The second group of releases came from the fourth backcross generation: `Fern' and `Selva' (1983); `Muir', `Mrak' and `Yolo' (1987). Of these eight, `Selva' has a proven commercial performance record in California, presently ranking second. The third group of releases all come from the fifth backcross generation: `Irvine' (1988); `Seascape' and `Capitola' (1990). Relative day-neutrality strength and fruiting and vegetative responses to plant conditioning are compared.

ORIGIN AND CHARACTERISTICS OF THE UNIVERSITY OF CALIFORNIA DAY-NEUTRAL STRAWBERRY CULTIVARS