Abstract
Micropropagated plants of `Heritage' primocane-fruiting (PF) red raspberry (Rubus idaeus L.) were planted at in-row spacings of 100, 50, or 25 cm. Yield per unit area during the first season was positively correlated with initial plant in-row spacing. During the first season of growth, initial plant in-row spacing did not affect the total number of primocanes that developed but was positively associated with the numbers of primocanes that fruited. Yield per primocane, primocane yield efficiency, total nodes per primocane, and number of fruiting nodes per primocane were not affected by plant in-row spacing in the first year. Average fruit weight and fruiting primocane diameter in the first year were negatively associated with plant in-row spacing. Photosynthetic photon flux density (PPFD) penetrating the row canopy as measured in the first season was not affected by treatment. Treatment did not influence percentage of fruit exhibiting solar injury, shattering, or infection by Botrytis cinerea. Plant in-row spacing did not influence yield during the second and third production seasons.
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