Full TGIF Record # 3017
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Author(s):Dunn, J. H.; Das, N. K.; Hemphill, D. D.
Author Affiliation:Dunn: Assistant Professor; Das: Graduate Student; Hemphill: Professor, Department of Horticulture, University of Missouri, Columbia, Missouri
Title:Chemical control of yellow nutsedge in a mixed Common Bermudagrass-Common Kentucky bluegrass lawn turf
Section:Weed control in horticulture crops and turf
Other records with the "Weed control in horticulture crops and turf" Section
Meeting Info.:Lexington, Kentucky: December 8-10, 1970
Source:Proceedings: North Central Weed Control Conference. Vol. 25, 1970, p. 83-84.
# of Pages:2
Publishing Information:[Urbana, Illinois: Department of Agronomy, University of Illinois]
Keywords:TIC Keywords: Cynodon dactylon; Poa pratensis
Abstract/Contents:"Yellow nutsedge continues to be one of the major weed nuisances in turfgrass. Underground tubers contribute to the persistence of this plant and make selective control difficult with commonly available herbicides. Arsonates, 2, 4-D, and combinations of these materials have been commonly recommended for control with varying degrees of success. Several of these chemicals, including 2, 4-D amine, MSMA + surfactant, MSMA + 2, 4-D liquid suspension, and an experimental from Amchem, Code 67-116, were applied to a mixed Common Bermudagrass-Common Kentucky bluegrass lawn turf at 3-week intervals beginning on May 19, 1970, when newly-emerged nutsedge shoots were about 1-inch high. Rates of application at each of 4 treatment dates were 1 and 2 lb/A of 2, 4-D amine, 2 and 4 lb/A of MSMA, 2 and 4 lb/A of Code 67-116 and 2 + ½ and 4 + 1 lb/A of MSMA + 2, 4-D. One-half of the plots treated with 2, 4-D at 2 lb/A and MSMA and MSMA + 2, 4-D at the low and high rates of application received 1 lb/A of ethrel, which preceded each herbicide treatment. Treatment of nutsedge with 2, 4-D at 2 lb/A, MSMA at 2 and 4 lb/A, and MSMA + 2, 4-D at 2 + ½ and 4 + 1 lb/A gave 85% or more control, as shown by counts of nutsedge shoots/sq ft on August 11, 1970 (Table 1). This result occurred when herbicides were used alone or in combination with ethrel. Applications of 2, 4-D at 1 lb/A appeared to be less effective than the 2 lb/A rate, but differences were not significant at .05. Code 67-116 gave poor control compared with the other herbicides. Estimations of % nutsedge control at 4 intervals during the summer generally showed the same relative control by herbicides as was measured from shoot counts on August 11. However, the estimated % control for each treatment was less than that calculated from shoot counts. No significant differences in nutsedge control occurred among the 4 evaluation dates. Shoot counts made on September 24, 1970 show little change in nutsedge population of treated plots, compared with counts made on August 11 (Table 1). There was a 78% decrease in the number of nutsedge shoots found in control plots during this same interval. Presumably, this decline in population was caused by natural mortality as plants aged in early fall. An accurate evaluation of the more residual effect of herbicide treatments was not possible at this late date because of the small population of nutsedge shoots. Injury to permanent turf occurred when applications of MSMA at 4 lb/A and MSMA + 2, 4-D at 4 + 1 lb/A, plus ethrel at 1 lb/A were made during a period of moisture stress in early July. The effect was a yellowing of Common Bermudagrass and complete kill of Common Kentucky bluegrass topgrowth. All other rates of MSMA and MSMA + 2, 4-D applied alone or in combination with ethrel caused slight discoloration of the turf during this same interval."
Note:This item is an abstract and tables only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Dunn, J. H., N. K. Das, and D. D. Hemphill. 1970. Chemical control of yellow nutsedge in a mixed Common Bermudagrass-Common Kentucky bluegrass lawn turf. Res. Rep. North Cent. Weed Control Conf. 25:p. 83-84.
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