Strawberry (Fragaria × ananassa Duch.) seedlings from 54 crosses between day-neutral and short-day parents were evaluated in western Washington for the proportion which flowered by September and for the earliness of such flowering when it occurred. The day-neutral progeny of ‘Aptos’, ‘Brighton’, ‘Hecker’, CN5, CN11, CN20, WSU 1714E and SHRI 7020/131, all day-neutral parents, flowered early. The day-neutral progeny of ‘Aiko’,’Linn’, ‘Olympus’ and ‘Tioga’, all short-day parents, flowered late. Crosses producing the highest percentage of day-neutral seedlings also had the highest percentage of day-neutral seedlings which flowered early. Reciprocal crosses produced similar results relative to the proportion of day-neutral seedlings and for the proportion of such seedlings which flowered early. For date of first flowering, general combining ability was found to be more important in these crosses than specific combining ability.
Received for publication Dec. 3, 1981. Scientific Paper No. 6082. Washington State University, Agricultural Research Center, Pullman, WA 99164. Project 0038.
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The technical assistance of R. Schwinkendorf, Annette Summerhill, and L. C. Torre is gratefully acknowledged.