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Abstract
In a 3-year study of ‘Willamette’ red raspberry canes the number of berries per lateral and the number of berries per cane were positively correlated with cane diameter. The number of fruitful nodes per cane was negatively correlated with cane diameter. Increased cane height caused more berries per lateral but the effect on number of berries per cane was minimal because of fewer fruiting laterals. The yield of ‘Puyallup’ was more adversely affected by reduced numbers of fruiting laterals than that of ‘Willamette’.
Higher topping increased the number of berries per cane by leaving more fruiting laterals. Berries per lateral was affected more by the amount removed in topping than by height of topping.
Cane diameter and height accounted for less than 25% of the variation in total berry production. Cane quality and other factors must also be considered in developing production practices for maximum yield.
Abstract
Fruitfulness of individual red raspberry (Rubus idaeus L.) canes was increased by reduction of cane number per hill and by increase in cane diameter. Yield per hectare, however, was greatly increased by more canes per hill. Floral primordia bud number was more advanced in the fall on small-diameter canes, but the difference between small- and large-diameter canes disappeared by spring. Berry number and percentage fruit set were greater for large-diameter canes and were related to amount of available carbohydrate per node. Excessive moisture stress in late summer tended to delay carbohydrate build up.