EFFECTS OF SUCCINIC ACID 2,2-DIMETHYLHYDRAZIDE, 2-CHLOROETHYLPHOSPHONIC ACID, AND ETHYLENE ON RESPIRATION, ETHYLENE PRODUCTION, AND RIPENING OF "REDHAVEN" PEACHES

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Abstract
Succinic acid 2,2-dimethylhydrazide (Alar) and 2-chloroethylphosphonic acid (Ethrel) were applied to peach (Prunus persica L. cult "Redhaven") trees 7 and 9 weeks after bloom, respectively. Fruits harvested weekly throughout the growing season were examined for respiratory behavior and ethylene production with and without the addition of ethylene gas. All fruits harvested during the first (stage 1) of the two periods of rapid fruit growth, as well as mature fruits (in late stage 3), displayed a climateric respiratory pattern and produced appreciable amounts of ethylene. Alar significantly increased the ethylene production associated with ripening. Ethrel increased ethylene production only in ripening fruits not given the postharvest ethylene treatment. Both Alar and Ethrel advanced and favored uniform fruit ripening, the combination of these materials appearing to be most effective.

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