. Cranberries; : the national cranberry magazine. Cranberries. Merits of neyir By IRVING E. DEMORANVILLE and ROBERT M. DEVLIN Editor's Note: The authors are with the Massachusetts Cranberry Experiment Station. Cranberry bogs in southeastern Massachusetts have many weed problems, two of the most common of which are Cyperus dentatus (nutsedge) and Leersia oryzoides (cutgrass). Nutsedge and cutgrass—found in about 80 per cent of the Massachusetts cranberry acreage- cause some reduction in yield. There is no accurate data on the precise percentage of yield reduction where these two weeds are prese
. Cranberries; : the national cranberry magazine. Cranberries. Merits of neyir By IRVING E. DEMORANVILLE and ROBERT M. DEVLIN Editor's Note: The authors are with the Massachusetts Cranberry Experiment Station. Cranberry bogs in southeastern Massachusetts have many weed problems, two of the most common of which are Cyperus dentatus (nutsedge) and Leersia oryzoides (cutgrass). Nutsedge and cutgrass—found in about 80 per cent of the Massachusetts cranberry acreage- cause some reduction in yield. There is no accurate data on the precise percentage of yield reduction where these two weeds are present, but it could range from less than 1 per cent to possibly 50 per cent or more in heavy infestations of cutgrass. A reasonable average might be about 20 per cent. Since the Massachusetts growers are expected to receive a gross return in excess of 20 million dollars for their 1978 crop, a 20 per cent reduction in yield represents a potential loss to the grower of 4 million dollars. Obviously, good control of these two weeds would have important economic significance. GROWERS manage to control nutsedge and cutgrass through the use of Casoron and Evital. However, the use of these herb- icides presents some problems. Casoron does not eradicate nutsedge or cutgrass but only suppresses growth for most of the growing season. This is not sufficient because by the fime the berries are beginning to increase in size and color, these weeds are generally tall and abundant enough Cited to compete with the cranberry vines for water, nutrients and light. This may result in smaller and inadequately colored berries. Also, since the weeds are not eradicated, annual applications of Casoron are necessary. Since cranberry vines are only slightly more tolerant of Casoron than nutsedge or cutgrass, the grower must guard against vine injury. For example, the gradual buildup of Casoron residues in the soil as a result of several annual applications-or an uneven application of the herbicide-can damag
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