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Crop Load Management of Apple by Chemical Fruitlet Thinning, Preharvest Drop Management, and Investigation of Abscission Physiology

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Title: Crop Load Management of Apple by Chemical Fruitlet Thinning, Preharvest Drop Management, and Investigation of Abscission Physiology
Author: Arseneault, Michelle
Department: Department of Plant Agriculture
Program: Plant Agriculture
Advisor: Cline, John
Abstract: New crop load management strategies are required for apple trees to thin fruit and delay preharvest fruit drop (PFD). The efficacy of the chemical thinners 1-aminocyclopropane-1-carboxylic acid (ACC) alone, and abscisic acid in combination with 6-benzyladenine was determined on 'Gala' apples. The efficacy of ethephon and ACC was determined when fruitlets were 15-25 mm, outside the traditional thinning window. Abscisic acid and ACC produced acceptable fruit set, crop load, and quality in one year and ACC applied at 15-25 mm was effective only at 15-16 mm. In another study, ‘Honeycrisp’ was used to evaluate the efficacy of aminoethoxyvinylglycine, naphthaleneacetic acid, and foliar sprays of boron and magnesium on PFD. Fruit drop was reduced 27% by naphthaleneacetic acid and 35% by aminoethoxyvinylglycine while maturity was delayed. Cultivars prone and not prone to PFD were compared for seasonal xylem function in the fruit, which was lower in the cultivar prone to PFD.
URI: http://hdl.handle.net/10214/10061
Date: 2016-10
Rights: Attribution-NonCommercial-NoDerivs 2.5 Canada
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Attribution-NonCommercial-NoDerivs 2.5 Canada Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivs 2.5 Canada