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The Effects of Node Position, Shoot Vigor, and Strain on ‘Delicious’ Apple Spur Development1


Bud weight, and spur number, length, and fruitfulness were measured in shoots of ‘Delicious’ apple (Malus domestica Borkh.). In 2-, 3-, and 4-year-old wood, spur number, length, and fruitfulness were greater at the subapical nodes than at the basal nodes of the shoot. In dormant 1-year-old shoots, bud weight was affected by strain, node, position, and vigor. Axillary buds were largest in the apical portion of standard ‘Delicious’ shoots and in the basal portion of spur-types. In extremely vigorous shoots of ‘Gardner Delicious’ basal buds did not grow at the beginning of the second growing season unless treated with 6-benzylamino purine (BA), which induced normal spurs.