‘Austin Thornless’, served as a dominant source of spinelessness. Later recessive sources of spinelessness were obtained. Selection among various Rubus has concentrated on thornlessness, plant habit, fruit quality, fruit size, disease and pest resistance, adaptability to machine harvest, chilling requirements, and postharvest life (Daubeny 1996). 3. Vacciniums. Species of Vaccinium , Ericaceae ( x =12), include cultivated blueberries and cranberry, both domesticated in the 20 th century. The lingonberry is widely gathered but can hardly be considered domesticated despite recent selections of elite types; cultivation consists almost entirely of managing natural stands. A number of Vaccinium species such as bilberry ( V. myrtillus ) and bog bilberry ( V. uliginosum ) are potential domesticates (Galletta and Ballington 1996). Blueberry. There are five major classes of blueberry grown commercially: lowbush, highbush, halfhigh, southern highbush (low chill), and rabbiteye. In lowbush (tetraploid
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