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B.M. Yorgey and C.E. Finn

We would like to acknowledge the generous support of the Oregon Raspberry and Blackberry Commission. We would like to thank our panelists for the time and effort devoted to this evaluation.

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Bernadine Strik, Juliet Mann, and Chad Finn

Twenty-one genotypes of blackberry (Rubus L. subgenus Rubus Watson) were evaluated for percent drupelet set in 1993 and eleven genotypes were evaluated in 1994. Commercial cultivars were chosen to represent types (trailing, erect, and semi-erect) of blackberries grown in the United States. Secondary fruit were picked when green but developing a red blush during the early- and late-ripening season. Drupelets and pistils per fruit were counted to calculate percent set. In 1994, ripe fruit ranging in size were harvested for `Boysen', `Marion', `Thornless Evergreen', and `Chester Thornless' and drupelet per fruit were counted. Drupelet set among genotypes ranged from 40% to 86% in 1993 and 39% to 78% in 1994. Most genotypes had a higher percent set on early flowers compared to later ones. Drupelet set and number were not correlated with fruit weight among genotypes. In `Boysen', `Marion', `Thornless Evergreen', and `Chester Thornless', drupelet number was correlated with fruit weight, although the relationship in `Chester Thornless' was not as strong as the others. It is unclear what factors limit drupelet set in the genotypes studied.

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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

Open access

Chad E. Finn, Bernadine C. Strik, Brian M. Yorgey, Mary E. Peterson, Patrick A. Jones, Jungmin Lee, Nahla V. Bassil, and Robert R. Martin

-erect along with ‘Black Diamond’, ‘Columbia Star’, ‘Hall’s Beauty’, and ‘Marion’ trailing blackberries harvested in 2017 from trials at Oregon State University's North Willamette Research and Extension Center (Aurora, OR). z In 2016 and 2018, ‘Twilight’ was

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Chad E. Finn, Bernadine C. Strik, Brian M. Yorgey, Mary E. Peterson, Patrick A. Jones, Gil Buller, Sedat Serçe, Jungmin Lee, Nahla V. Bassil, and Robert R. Martin

. Anthocyanin concentrations (mg cyanidin-3-glucoside/100 g) of the semierect ‘Eclipse’ and ‘Galaxy’ along with ‘Black Diamond’, ‘Columbia Giant’, ‘Columbia Star’, and ‘Marion’ trailing blackberries harvested in 2015 from trials at Oregon State University

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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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Chad Finn and Robert Martin

Cuttings from Rubus ursinus Cham. & Schlecht, the trailing blackberry, were collected in Oregon, Washington, and British Columbia from 21 sites. The cuttings were rooted and placed in pots in the greenhouse. After the plants began to grow, leaves were harvested for ELISA testing using standard procedures. Each sample represented three clones from a site. Plants from 18 sites were represented by five samples and two sites were represented by three samples. None of the samples tested positive for the presence of raspberry bushy dwarf virus or tomato ringspot virus. Forty-four percent of the samples tested positive for tobacco streak virus. Only 33% of the sites on the Pacific coast tested positive for tobacco streak, whereas, 100% of the Cascade Mountain sites and 88% of the sites in the coastal range type environment tested positive. The only site in the Willamette Valley had no positive tests. With one exception, all of the sites that tested negative for the virus were also low elevation sites 0-90 m.

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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

Open access

Chad E. Finn, Bernadine C. Strik, Brian M. Yorgey, Mary E. Peterson, Patrick A. Jones, Gil Buller, Jungmin Lee, Nahla V. Bassil, and Robert R. Martin

al., 2020 ). As with ‘Eclipse’, the ploidy of ‘Galaxy’ has not been determined, but is presumed to be tetraploid because it crossed readily with, and produced fertile offspring with, other tetraploid parents, whereas crosses with trailing blackberries

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Huan-Keng Lin, Tzu-Yao Wei, Chin-Mu Chen, and Der-Ming Yeh

phloem fiber in upright periwinkle. We dissected the stem and observed the phloem fiber in four other upright cultivars (including the Taoyuan series and Jams ’N Jellies Blackberry) but not in 18 other trailing cultivars (including the Cora Cascade