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Jean-Pierre Privé, J.A. Sullivan, J.T.A. Proctor, and O.B. Allen

Abbreviations: CHU, corn heat units; GDD, growing degree days; PF, primocane fruiting. 2 Dept. of Mathematics and Statistics. Financial assistance from Agriculture Canada to J-P.P. while on educational leave is gratefully acknowledged. This study

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Jessica M. Cortell and Bernadine C. Strik

Treatments consisting of 0, 4, 8, or 12 floricanes were established in March 1993. An additional treatment was set up with zero floricanes and early primocane pruning. Starting in April and continuing through early November, weekly primocane measurements were taken including: number of nodes, number of primocanes, number of branch canes, length of primocanes, and length of branch canes. Additional plants in each treatment were harvested in August to assess total biomass partitioning. The zero floricane treatment had a significant increase in the number and length of both primocanes and branches. Primocanes grown without competition from floricanes had a 65 % increase in primocane dry weight. Primocane pruning resulted in significantly shorter internodes, an increase in branch dry weight, and a decrease in total length of the primocanes. The increase in total primocane biomass with removal of the floricanes should contribute to higher yields the following season.

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

‘Kokanee’ ( Fig. 1 ) is a new primocane-fruiting red raspberry ( Rubus idaeus L.) from the U.S. Dept. of Agriculture–Agricultural Research Service (USDA–ARS) breeding program in Corvallis, OR released in cooperation with the Oregon State

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Bernadine C. Strik and Amanda J. Vance

trailing cultivars ranges from late June through July with erect and semierect types fruiting from late July through August and early August through early October, respectively. All of these blackberry types produce biennial canes. The primocanes of these

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Shengrui Yao and Carl J. Rosen

harvested for primocane-fruiting raspberries. In warm years with later killing frosts, growers can expect to have a reasonable crop of fall raspberries; but in other years, growers might have a minimal crop or none at all (D. Wildung, personal communication

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Héctor Germán Rodríguez, Jennie Popp, Michael Thomsen, Heather Friedrich, and Curt R. Rom

). In 2004, the UA released ‘Prime-Jan ® ’, a primocane-fruiting blackberry ( Clark et al., 2005 ). This thorny, erect cultivar forms terminal flowers in late summer and fruit during the autumn. A detailed description of this genotype is given by Clark

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Ellen Thompson, Bernadine C. Strik, Chad E. Finn, Yanyun Zhao, and John R. Clark

begin (Mark Hurst, Hurst's Berry Farm, Sheridan, OR, personal communication). Blackberry prices are typically highest during this annual lag period in fruit production. Primocane-fruiting blackberries may offer the advantage of extending the harvest into

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Michele A. Stanton, Joseph C. Scheerens, Richard C. Funt, and John R. Clark

, flower buds for the following season's crop are virtually destroyed ( Funt et al., 2000 ; R.C. Funt, unpublished data). Because canes can be managed as annuals, the two recently released primocane-fruiting (PF) cultivars from the University of Arkansas

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Bernadine C. Strik and Gil Buller

Soft-tipping (removal of 2–5 cm) primocane-blackberry canes once ( Drake and Clark, 2003 ; Strik et al., 2008 and 2012 ; Thompson et al., 2009 ) or double-tipping (main cane and branches; Thompson et al., 2009 ) has been shown to increase yield

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John R. Clark

‘Prime-Ark ® Freedom’ (to be U.S. plant-patented as ‘APF-153T’) is the world’s first commercially released thornless primocane-fruiting blackberry ( Rubus L. subgenus Rubus Watson). This novel development is intended primarily as a home garden