Volume 33 Number 4 Article 2 Pages: 114-117
Year 1979 Month 10
Title: Use of Ethrel to Stimulate Coloring and Ripening of Minnesota Apple Cultivars
Author: L.B. Hertz
Citation
Abstract:
Increased red color and early maturation of preharvest 2-chloroethylphosphonic
acid (Ethrel) treated
apples has been reported frequently
(3, 4, 5, 7). However, this early fruit
maturity and accelerated red color development has been associated with a
hastening of abscission of mature
apple fruits (3) and a decrease in
firmness of the apple flesh (3, 5, 7).
Eclgerton (3) and Unrath (7) report
ed that 2,4,5 trichlorophenoxypropionic
acid (2,4,5-TP) effectively
counteracts the promotion of abscission by Ethrel.
They also stated that
even though a mid-summer application of succinic acid 2,2-dimethyl
hydrazide (Alar), 60 to 70 days before harvest, delayed apple abscission,
preharvest application of Ethrel effectively overcame this delay.
Alar does,
however, improve apple flesh firmness
(1,2) and delay the appearance of
the physiological discolor watercore
(2).
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