![]() July-suppressed plants were generally hardiest for all tissues. The LT 50 developed for each suppression date was compared to the control. After 5 days at room temperature following freezing, growing point, budbase, vascular, and pith tissues were evaluated for tissue browning on a 1 to 5 scale. In December and January, the-6 temperature was replaced with-21C. One-node samples were exposed to controlled freezing at temperatures of 4, -6, -9, -12, -15, and -18C in November through February. A single cane was removed from each replication of the five primocane suppression dates at monthly intervals from mid-November to mid-February 1991-92, and from mid-November to mid-January 1992-93. An unsuppressed control was included in which primocanes were not cut. Primocanes of `Marion' trailing blackberry plants were suppressed by cutting them off at ground level in either late April, May, June, or July 19. August-trained plants also produced longer canes with more nodes and a greater number of fruit per main cane lateral. August-trained plants yielded 46% more than February-trained plants, primarily because of higher percent budbreak on main canes. Yield of April-, May-, and June-suppressed plants exceeded that of unsuppressed plants in 1993. Consequently, yield of April-suppressed plants exceeded that of unsuppressed plants in 1992. Cane number and total main cane length per plant were increased in April-, May-, and June-suppressed plants in 1992 and for April- and June-suppressed plants in 1993. Internode length decreased and main cane percent budbreak increased with later suppression date. Cane length was greatest for unsuppressed and April-suppressed plants. Cane diameter was greatest for unsuppressed plants and declined with later primocane removal date. Yield data were collected in 19, after which yield components were measured. Four canes per plant were trained in either August or February, with all other canes being removed and measured. ![]() A control was included in which primocanes were not cut. Primocanes of `Marion' trailing blackberry plants (Rubus spp.) were suppressed by cutting them off at ground level in either late April, May, June, or July 19. ![]()
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