EFFECTS OF GROWTH REGULATORS ON SHOOT REGROWTH AND WOUND HEALING OF PRUNED ALMOND BRANCHES.

A. Blanco
Watershoot regrowth follows pruning of large branches when the trees are cut back either for containment pruning or top-working new varieties or species. Thereafter gummosis or branch die-back usually occur.

The application of NAA in slow-release paints has led to a certain control of shoot regrowth, either decreasing the number of watershoots or their length. A 0.5 % concentration appeared to be as effective as higher concentrations. The addition of GA3 or BA did not enhance the effect of NAA, although the cytokinin inhibited shoot growth significantly, and GA3 had a promoting effect.

Callus growth on the pruning wound was promoted on the branches treated with IBA, BA and low concentrations of NAA, while gummosis appeared on those treated with high concentrations of NAA, 2, 4, 5-TP and GA3. Anatomical observations carried out on branches treated with high concentrations of NAA and 2, 4, 5-TP showed the formation of rings of gum ducts.

Blanco, A. (1983). EFFECTS OF GROWTH REGULATORS ON SHOOT REGROWTH AND WOUND HEALING OF PRUNED ALMOND BRANCHES.. Acta Hortic. 137, 169-178
DOI: 10.17660/ActaHortic.1983.137.17
https://doi.org/10.17660/ActaHortic.1983.137.17

Acta Horticulturae