Ethephon has mixed effects on table grapes
The growth regulator ethephon (Ethrel) has been shown to improve coloring of the table HAIR GEL grape varieties, Red Malaga, Queen, Tokay, and Emperor if applied after some of the berries have begun to show color.Preliminary trials with Cardinals showed slight color 20-30mmHg benefits, of dubious commercial significance.Trials with Ribier have neve