Abstract
SummaryA trial was conducted at the Grove Research Station in the Huon Valley of Southern Tasmania in 1984/85 using naphthalene acetic acid as a thinner for mature ‘Golden Delicious’ trees. Sprays were applied at concentrations of 10 or 20 ppm NAA, at spray volumes of either 4 000 or 7 000 l ha-1 at 0800,1200,1600 or 2000 hours, 10 days after full bloom. Twenty ppm removed significantly more fruit than 10 ppm. Increasing the volume of spray from 4 000 to 7 000 l ha-1 also significantly increased fruit thinning. Spraying at 0800 hours removed more fruit than in the afternoon or evening. The relationship between fruit set and the timing of the spray between 0800 and 2000 hours was positive and linear. There was no significant interaction between concentration and timing of spray treatments for any of the variables recorded. Spraying with 7 000 l ha-1 in the early morning is recommended for thinning ‘Golden Delicious’.
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