Orchard growth and fruiting of micropropagated apple trees
1991
Zimmerman, R.H. | Miller, S.S.
Four apple (Malus domestica Borkh.) cultivars, Northern Spy, Ozark Gold, Stayman, and Rome Beauty, were tissue cultured on their own roots (TC) or were budded on seedling, MM.106, or M.26 rootstocks. All four cultivars were planted at Beltsville, Md., and 'Ozark Gold' and 'Stayman' were planted at Kearneysville, W. Va. TC trees produced more vegetative growth than trees budded on MM.106 and M.26 at both locations, but TC trees differed little in size from those budded on seedling rootstock. Flowering was delayed on TC and seedling rootstock trees relative to those on MM.106 or M.26 rootstocks. Fruit yields in general were low but were higher for the trees on clonal rootstocks than the TC or seedling rootstock trees, especially at Beltsville. The limited vegetative growth and poor fruit yield of trees on M.26 and MM.106 at Beltsville may have been due to significant infestation by plant parasitic nematodes at this site. TC trees seemed to have been less affected by the nematodes, probably because of their greater vigor and more extensive root systems. All trees at Kearneysville were more vigorous than comparable ones at Beltsville.
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