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Abstract
The effect of various combinations of dinitro-o-cresol (DNOC) and narrow-distillation-range mineral oil (NRO) was tested during 4 consecutive years on breaking bud-rest and on fruiting of ‘Golden Delicious’ apple trees under mild winter conditions. Breaking of lateral leaf buds was directly correlated with oil concentration between 2.4 and 8.8%, while DNOC did not increase bud break at concentrations over 0.12% in the rest-breaking spray. Lower phytotoxicity of NRO compared with winter oil allowed safe use of higher concentrations of the former. Increased lateral leaf bud-break resulted in formation of more spurs and thus increased the yield in subsequent years. These higher yields were not accompanied by reductions in mean fruit weight or in trunk diameter, suggesting an increase in overall bearing potential of the tree by the best rest-breaking treatments.
Published Version
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