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angle apple rootstocks axis system bud union burrknots central leader system central leader trees clonal rootstocks components dwarfing rootstocks early production end post feet fire blight freestanding central leader Fruit Grower fruit production fruit quality Golden Delicious Granny Smith high density orchards high tree densities horizontal hybrid tree cone HYTEC inches intensive orchard lateral branches light distribution limbs M.9 EMLA multi-row Netherlands nursery tree older wood orchard system orchardists palmette percent planted pole precocious produces a tree production per acre pruning and training reduce removed root suckers scion scion variety seedling rootstock shoot growth shortening single rows slender spindle system soil line South Tyrol spindle trees spur-type stocks stoolbeds strains of Delicious sunlight support system three-row training techniques tree arrangement tree quality tree training trees per acre trees/acre trellis trials trunk two-year-old vigorous rootstocks Vineland Washington State University winter hardiness wire woolly apple aphid yield efficiency