01738naa a2200265 a 450000100080000000500110000800800410001910000150006024500990007526000090017452010500018365300160123365300170124965300130126665300140127965300110129365300100130465300180131465300190133265300190135165300100137070000190138070000190139977300540141810392642005-09-06       2003    bl uuuu     u00u1 u    #d1 aTAKEDA, F.  aPrimocane Growth in ?Chester Thornless? Blackberry Trained to the Rotatable Cross-arm Trellis.  c2003  aA study was conducted to characterize vegetative growth of mature ?Chester Thornless? blackberry plants trained to the rotatable cross-arm (RCA) trellis in which up to six primocanes were retained. Cane emergence occurred from mid-April to late-May. The first (oldest) primocane attained a sufficient height to be trained in early May in 40% of plants, but younger primocanes could not be trained until late July. However, only 94%, 73%, 60%, and 42% of plants developed three, four, five, and six primocanes, respectively. In primocanes that were trained from 14 May to 3 June, eight or nine medium (0.7?1.3 m) to long (&gt1.3 m) lateral branches developed. Primocanes tied from 4 June to 16 July averaged less than six lateral branches that were mostly of medium and short (&lt0.7 m) categories. Primocanes trained after 16 July produced only two short lateral branches. The results indicated that training primocanes from mid-May to mid-June for ?Chester Thornless? blackberry on the RCA trellis would be advantageous to minimize labor costs.  aAmora preta  aAxillary bud  aFloracao  aFloricane  aFlower  aFruit  aInflorescence  aInflorescencia  aLateral branch  aRubus1 aHUMMELL, A. K.1 aPETERSON, D.L.  tHortscience, Alexandriagv.38, n.3, 2003. CD-ROM.