Influence of Floricane Number on Primocane Growth, Cold Hardiness, and Yield Components in `Marion' (Rubus sp.) Blackberry

in HortScience
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  • 1 Dept. of Horticulture, Oregon State Univ, ALS 4017, Corvallis, OR 97331.

In Spring 1993 and 1994, treatments of 0, 4, 8, and 12 floricanes per plant were established in a mature `Marion' planting. Primocanes were measured weekly for the number and length of primocanes and primocane branches. Maximum hardiness of primocanes was determined in Jan. 1994 and 1995 by controlled freezing. Yield components were measured in both the current and following season. Additional plants were harvested in summer and winter for dry-weight partitioning. Plants with no floricanes had an increased number and length of primocanes and branches than plants with floricanes in 1993, with similar trends in 1994. Primocane growth on plants without floricanes showed a 65% increase in primocane dry weight in 1993. However, in 1994, there were no significant differences among treatments. Primocane branch dry weight generally increased with decreasing floricane number. The relationship between primocane growth and the following season's yield components will be presented.

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