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[TM]APPLE STUDY
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Win Cowgill1, Jeremy Compton2, Gary Donato3, Ging Lee4
Rutgers University, New Jersey Agricultural Experiment Station
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Evaluate the Plant Bioregulator (PBR) Typy[TM](Agtrol, Inc.) in randomized studies with Promalin®
PBR (Abbott Laboratories) for increasing calyx elongation in Red Delicious apples (Fig. 1).
Red Delicious cultivars are the most widely planted and market accepted apple cultivar in the world
today. US production averages 104 million (42-lb.) units, comprising nearly 39% of total production
annually (US Apple). Consumer demand remains high for this cultivar annually, and is a constant in
this ever-evolving industry.
Although one of the most prominent features and marketing focuses of Red Delicious is the
development of prominent calyx lobes in some years they fail to form adequately. Year to year
variations in weather and microclimatic diversity can inhibit these calyx lobes and the resulting Length
to Diameter ratio. Promalin®(GibberellinsA4A7 +6-benzyladenine) has been an industry standard for
the past 15 years to increase calyx elongation especially in eastern grown red delicious and enhance
their perceived marketability.
The recent introduction of another GibberellinsA4+7 +6-benzyladenine product by Agtrol, Inc.
(Typy[TM]) gives growers a choice of materials. In 1999 we evaluated both Typy[TM]and Promalin®
againstuntreated controls in two replicated studies for product performance in increasing calyx
elongation.
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1
2
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Rutgers University, Snyder Research and Extension Farm, Hunterdon County, NJ
140 Locust Grove Rd. Pittstown, NJ 08867
Pittstown Fruit Farm, Inc. Franklin Township, Hunterdon County, NJ
1074 Croton Rd. Pittstown, NJ 08867
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A six-year-old block of Super Chief®Red Delicious apples on M26 EMLA were used to
conduct this experiment at the Rutgers University, Snyder Research and Extension Farm site. The
experiment was a randomized complete block design with single tree treatments and five replications.
Pittstown Fruit Farm, Inc. provided a 10 year old block of Red Chief®Red Delicious on M26 for the
second experiment. This trial was conducted in a randomized complete block design containing seven
replications with single tree treatments.
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1Professor, Rutgers Cooperative Extension, Extension Center, 4 Gauntt Place, Flemington, NJ 08822
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2
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4
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North Jersey Tree Fruit Technician, Rutgers University, Snyder Research and Extension Farm, 140 Locust
Grove Rd. Pittstown, NJ 08867
Plant and Soil Science Technician, Rutgers University, Snyder Research and Extension Farm, 140 Locust
Grove Rd. Pittstown, NJ 08867
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Proprietor, Pittstown Fruit Farm, Inc. 1074 Croton Rd. Pittstown, NJ 08867
1999 North Jersey Tree Fruit Annual Report
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