Kim-Yen Phan-Thien - Delay in ripening of Gala and Pink Lady apples in commercial orchards following pre-harvest applications of aminoethoxyvinylglycine

Document created by Kim-Yen Phan-Thien on Aug 22, 2014
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  Phan-Thien K-Y, Wargo JM, Mitchell LW, Collett MG, Rath AC (2004)   Delay in ripening of Gala and Pink Lady apples in commercial   orchards following pre-harvest applications of   aminoethoxyvinylglycine. Australian Journal of Experimental   Agriculture 44, 807-812.


  Aminoethoxyvinylglycine (AVG) was applied to Gala and Pink Lady   apple trees on commercial orchards at label rates (830 g/ha   ReTain with 0.1% v/v organosilicone surfactant) 21–28 days before   anticipated first harvest. Fruit from treated and untreated trees   in each orchard were sampled weekly during the commercial harvest   period (2–6 times) and assessed for starch pattern index,   background colour, soluble solids and flesh firmness. Ripening of   AVG-treated Gala apples was delayed by 9–12 days based on starch   pattern index and background colour whereas fruit softening was   delayed by 5 days. Ripening of AVG-treated Pink Lady apples was   delayed by 5 days based on SPI and fruit softening was delayed by   7 days. These differential delays for starch pattern index and   fruit softening did not adversely affect the fruit quality of   either apple variety, as there was no difference between the   flesh firmness of treated and untreated fruit when fruit of the   same starch pattern index were compared. Regardless of treatment,   Gala apples grew an average 1.16 g per day during the harvest   period whereas Pink Lady apples grew an average 0.22 g per day.   These results suggest AVG has major benefits as a harvest   management tool, as it allows growers to regulate fruit ripening.

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