‘Maygold’ and ‘Q310-7’ peaches were thinned adequately with 300 to 400 ppm N-l-naphthylphthalamic acid (NPA) applied at full bloom; ‘Armgold’ was not satisfactorily thinned. ‘Early Amber’ was thinned when NPA was applied 5 days after full bloom. Optimum time of chemical thinning was affected by the length of the bloom period.
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