Volume 55 Number 2 Article 17
Year 2001 Month 4
Title: Chemical Thinning īGala` Apple in the Midwest
Authors: D.C. Ferree and J.C. Schmid
Abstract:
'Gala' trees were treated with various chemical thinners in eight trials conducted over four years.
NAA (naphthalene acetic acid) at 10 ppm applied at 10-12 mm fruit diameter caused reduction in fruit
set, but was not consistent in causing a fruit size increase.
Carbaryl (1-naphthyl N-methylcarbamate) at
2.5 ml/L applied at 10-12 mm fruit diameter consistently reduced fruit set, increased fruit size and improved return bloom compared to the untreated controls.
At petal fall, application of carbaryl failed to
thin 'Gala.' Accel (1.8% N-(phenylmethyl)-lH-purine-6 amino and 0.18% gibberellic acid) at 50 ppm
did not thin 'Gala' in three of these trials.
Endothal (heptani-2,3-dicarboxylate), an experimental bloom
thinner, reduced fruit set with an increasing effect with increasing rates.
Of the materials currently available carbaryl, applied at 10-12 mm fruit diameter was the most consistent thinning chemical for 'Gala'.
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