. Cranberries; : the national cranberry magazine. Cranberries. TOLERANCE OF CRANBERRIES TO THE EXPERIMENTAL HERBICIDE SAN-9789. by I. E. Demoranville, R. M. Devlin and K. H. Deubert Nutgrass, Cyperus dentatus and cutgrass, Leersia oryzoides are two of the more troublesome weeds that infest Massachusetts cranberry bogs. Growers are able to suppress the growth of nutgrass and cutgrass for about 75% of the growing season by the application of casoron (dichlobenil) or morcran, a formu- lated mixture of alanap and CIPC. However, by August and early September when berries are begin- ning to size and
. Cranberries; : the national cranberry magazine. Cranberries. TOLERANCE OF CRANBERRIES TO THE EXPERIMENTAL HERBICIDE SAN-9789. by I. E. Demoranville, R. M. Devlin and K. H. Deubert Nutgrass, Cyperus dentatus and cutgrass, Leersia oryzoides are two of the more troublesome weeds that infest Massachusetts cranberry bogs. Growers are able to suppress the growth of nutgrass and cutgrass for about 75% of the growing season by the application of casoron (dichlobenil) or morcran, a formu- lated mixture of alanap and CIPC. However, by August and early September when berries are begin- ning to size and color rapidly, these weeds have overcome the herbicidal effects and are of sufficient height and abundance to compete with the cranberry vines for sunlight, nutri- ents and water. This results in fruit that is slow to size and color which in turn causes a delay in the start of harvest. Also, since eradication of the weeds has not been effected, an annual application of some type of herbicide is necessary. Field tests from 1970 through 1972 have shown that nutgrass and cutgrass can be controlled for two entire growing seasons with the application of an experimental fluorinated pyridazinone herbicide called SAN-9789. The purpose of this study was to determine the effect of this herbicide on vines and fruit. Residue tests on berries were also conducted. A series of 25 plots, 64 sq. ft. in area was established in a latin square design on a section of weed-free cranberry bog with a relatively consistent stand of vines. SAN-9789 as a 5% granular formulation was applied in mid-April at rates of 0, 8, 12, 16 and 24 pounds per acre active ingredient. The variety used was Early Black and each treatment was rephcated 5 times. Effects on the vines were assessed visually in late August and the plots were hand scooped in the latter part of September. A sample of berries was taken from the total yield of each plot within 24 hours of harvest and frozen to stop color development. Red pigment c
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