ISHS Acta Horticulturae 227: International Symposium on Vegetative Propagation of Woody Species
FACTORS AFFECTING BUD-TAKE IN FRUIT AND ORNAMENTAL TREES |
| Authors: | B.H. Howard, J. Vasek |
| Abstract:
Despite the widespread replacement of T-budding by chip-budding, which matches the cambium of rootstock and scion to facilitate rapid union formation, many tree nurseries fail to obtain the expected high level of success. Failure of stock and scion to unite can be attributed to poor rootstock growth after budding in various fruit and ornamental trees. Root and shoot pruning reduced bud-take, as did the early cessation of growth associated with a particular seedling provenance. The tying material used to secure the bud chip to the rootstock interacted with the quality of rootstock growth. Depressed growth following root damage from residual herbicides, or from the presence of a replant disease, caused bud failure when self-degrading rubber ties were used. These lost elasticity after about three weeks and later fell off. Polythene ties left in place for between four and six weeks compensated for slow union formation. Where rootstock growth was not depressed abnormally, the weaker growing rootstocks within the population also benefited from having bud chips tied with polythene tape, while bud-take was improved on excessively vigorous stocks when rubber ties were used. Failure was also attributable to scionwood problems. Large differences in bud-take were associated with budwood from different sources, and with using immature buds within a source. | |
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