This is a short-day variety, Released in 1987 by the University of California, Davis, CA. It is a cross between "Parker" and a hybrid between "Tioga and Pajaro". Interest in it is increasing in south and central coast counties, with the winter planting system preferred. Oso is a high-yielding variety, generally later in production than is Chandler. The fruit is larger than that of any other California cultivar and has a conic to wedge shape. Flavor is excellent , color is medium to dark red, and firmness and shipping qualities are very good.