FIELD APPLICATION OF NEW ETHREL FORMULATIONS FOR EARLY COLOR ENHANCEMENT IN CRANBERRY (VACCINIUM MACROCARPON AIT.) FRUIT
The commercial value of cranberry depends upon the anthocyanin contents. Cranberry growers in Wisconsin are attempting to enhance the color development to increase profitability and to allow earlier harvest to avoid frost damage. Ethrel spray was not able to achieve these goals consistently. Our laboratory transport studies using different systems showed the problem was mainly the impermeable nature of the fruit cuticle. Changing the wettability by using Tergitol (0.3% v/v) and by increasing the surface binding and the penetrability of Ethrel by using compounds such as ethanol, ursolic acid, lysophosphatidyl ethanolamine, phosphatidyl dimethylethanolamine, dipalmitoyl, ascorbic acid and glycerin we were able to overcome this problem. In the last three years (85–87) we have made applications of these new formulations in the field. In this paper we focus on some of the new formulations that have been used in 1987 season. With these formulations we found an increase in anthoycyanin content in the fruit by about 35–60% over the control. Marketing grade and uniformity of color were very much improved. Fruit size in the treated berries was not reduced. All treated vines appeared normal. These results show that there is a potential for the early color enhancement in cranberry fruit using these new formulations.
Farag, Karim M., Palta, Jiwan P. and Stang, Elden J. (1989). FIELD APPLICATION OF NEW ETHREL FORMULATIONS FOR EARLY COLOR ENHANCEMENT IN CRANBERRY (VACCINIUM MACROCARPON AIT.) FRUIT. Acta Hortic. 241, 373-384