Tissue-culture propagated "Chicksaw" blackberry plants were set four feet apart in April of 2000 as part of a five-year trellising trial near Reidsville, Georgia. There were five treatments: an untrellised control, posts with plastic baling string on both sides, posts and three vertical wires, "raspberry" V trellis, and Limited Arm-Rotation Shift-Trellis (eliminated in 2003). There were four replications with twenty feet for each treatment per replication, for a total of 80 feet per treatment. Primocanes were tipped at 3.5 to four feet and re-tipped several times during the summer when new growth exceeded about 12 inches. Mature plant height at the end of the growing season was about five feet. Starting in the third growing season, yield data was collected from a ten-foot section of each replication. The highest-yielding trellis systems over a three-year period were Post and String and Raspberry V. The Post and String was an inexpensive trellis system, but it was more difficult to remove primocanes. The Raspberry V trellis offered advantages for management and PYO harvest. The Post and Wire trellis yields were not impressive, but it was easier to find all the ripe fruit for distant shipping.


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