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Abstract
Clones of peach (Prunus persica (L.) Batsch) were propagated from sprouted nodal cuttings made by undercutting sprouted buds 2 mm deep, from 5 mm above to 5 mm below each node when leaves were partially expanded. Rooting was greatest under mist when the basal hardwood tissue was dipped for 10 seconds in a solution of 100 to 500 ppm of indolebutyric acid (IBA) before insertion into a mixture of equal parts of sphagnum peat moss and perlite over underlying gravel. Rooting and transplanting success was equivalent to that for softwood cuttings without the problems of disease and late fall growth.
Abstract
Successful fruit thinning of apples (Malus domestica Borkh.) with CGA 15281, an ethylene-releasing compound, was demonstrated at 20 and 46 days past bloom. A rapid drop in fruit removal force was followed by fruit abscission on days 4 and 5. In contrast, ethephon often resulted in protracted abscission and complete fruit removal. Differential sensitivity to CGA 15281 existed among cultivars. Explants were less sensitive to ethylene than intact fruit, and could not be used for controlled experiments. No adverse effects of CGA 15281 were noted with the exception of some leaf drop in the interior of the tree.