Within-plant competition in the red raspberry. I. Primocane growth

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Abstract
The growth of primocanes in raspberry stools with a normal complement of fruiting canes (annual system) was compared with that in stools from which all fruiting canes had been removed prior to the start of the growing season (biennial system). The latter treatment led to the production of more primocanes, but their average height was less, largely because of reduced internode length. The total weight of primocane material produced in the biennial system was c. 30% greater than that from the annual. In the absence of fruiting cane, specific leaf areas of the primocanes were lower. Both this effect, and the shortening of the internodes, are attributed to the better light conditions enjoyed by the canes in the biennial system.

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