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Angela K. Anderson and Chad E. Finn

Morphological variation was examined in 20 populations of Rubus ursinus subsp. macropetalus from British Columbia, Washington, and Oregon grown in a common garden. There was significant variability between and within populations for most traits studied. Principal component analyses separated populations along geographical clines for traits of horticultural significance. PC1 represented a general vigor component in all trials, and formed a negative correlation with elevation in four of five analyses (r = 0.60, 0.58, 0.50, 0.49; P < 0.05). Autumn leaf senescence tended to increase from west to east and with elevation. With higher elevation, there was a tendency for fruit weight to decrease, for later vegetative budbreak and fruit ripening, and for a shorter budbreak to first flower interval. From north to south, budbreak became somewhat earlier, cane spot susceptibility decreased, and budbreak to first flower interval increased. Characterization of this species will assist breeders to identify possible sources of cold hardiness, disease resistance, improved vigor, and acceptable fruit traits for the improvement of cultivated trailing blackberry.

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W. B. Sherman and R. H. Sharpe


Temperate climate blackberries and raspberries exhibit weak growth and sparse fruiting in Florida (6, 8) because insufficient chilling in winter is obtained for normal termination of rest. Florida's native blackberries have been harvested since pioneer days for jams, pies, and fresh use, but this industry has remained very small. Rubus breeding was initiated at the University of Florida in 1953 to produce better bramble cultivars adapted for growing in warmer climates. Few introduced species and cultivars have an inherent low chilling requirement with sufficient winter cold hardiness to survive in Florida. Native types produce small berries with fruit quality below commercial acceptability. Moreover, lack of flavor is recognized as a limiting factor in most of the low chilling germplasm, especially in the trailing blackberries and ‘Mysore’ raspberry. Two reviewers of the Rubus project, G. M. Darrow, 1957, and I. C. Haut, 1958, suggested that major efforts should be made to combine features of high fruit quality from the non-adapted temperate zone varieties with climatically adapted local types.

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Fumiomi Takeda and John Phillips

Fresh market blackberry production has increased in the United States in the last 10 years. Commercial acreage of erect and trailing blackberry has expanded most notably in California (M. Jimenez, personal communication) and of erect blackberry in

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Bernadine C. Strik and David R. Bryla

Finn, 2012 ) of ‘Kotata’ trailing blackberry, Mohadjer et al. (2001) found that very little stored N was allocated to the primocanes of “on-year” plants (i.e., fruiting plants with both primocanes and floricanes). When 15 N was applied in the “off

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Bernadine C. Strik and Amanda J. Vance

sampled in Nov. 2013 and Oct. 2014 at Oregon State University’s North Willamette Research and Extension Center, Aurora, OR (unreplicated). Cultivars. Four trailing blackberry cultivars (‘Black Diamond’, ‘Columbia Star’, ‘Marion’, and ‘Onyx’), one erect

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seedlings, depending on the clove oil concentration and time of application. Clove oil concentrations selected for further study did not consistently affect root-knot nematode population numbers on greenhouse-grown cucumber. Trailing Blackberries Grown

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Lisa Wasko DeVetter, Suzette Galinato, Troy Kortus, and Jonathan Maberry

possibly increasing profitability by reducing labor costs of pruning and training. AY production is practiced in more than 60% of the trailing blackberry ( Rubus subgenus Rubus ) fields in Oregon ( Strik et al., 2007 ). Average yields were reduced by 20

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Bernadine C. Strik and Ellen Thompson

blackberry types such as the fresh market trailing blackberry cultivars Siskiyou and Obsidian and the erect cultivar Navaho considered to have much better fruit quality. Also, the yield of the floricane crop in ‘Prime-Jan’ and ‘Prime-Jim’ is not as high as

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Fumiomi Takeda, Kathy Demchak, Michele R. Warmund, David T. Handley, Rebecca Grube, and Charles Feldhake

that precedes extremely low temperatures. In Oregon, ‘Siskiyou’, another western trailing blackberry, did not show visible injuries after a winter in which temperatures dropped to 10 °F on several nights ( Finn et al., 1999 ). However, ‘Siskiyou’ has

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Javier Fernandez-Salvador, Bernadine C. Strik, and David R. Bryla

processed market, account for >75% of the 7200 acres of blackberry produced in Oregon in 2012 ( USDA, 2013 ). ‘Obsidian’ ( Finn et al., 2005b ) is the most widely grown trailing blackberry for fresh market in Oregon and is also grown in other production