Full TGIF Record # 227423
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Publication Type:
i
Report
Author(s):Bingham, S. W.; Shaver, R. L.; Bingham, D. G.
Author Affiliation:Virginia Polytechnic Institute and State University, Blacksburg
Title:Crabgrass susceptibility to dithiopyr in turfgrass
Section:Weed control in turf, pasture, and rangeland
Other records with the "Weed control in turf, pasture, and rangeland" Section
Meeting Info.:Atlanta, Georgia: January 15-17, 1990
Source:Proceedings: Southern Weed Science Society. Vol. 43, 1990, p. 154-155.
Publishing Information:Champaign, Illinois: Southern Weed Science Society
# of Pages:2
Abstract/Contents:"Dithiopyr was evaluated for crabgrass control in bluegrass from 1987 to 1989. The bluegrass was maintained for excellent quality except for mowing height in some experiments was lower (3.7 cm) to encourage crabgrass emergence. In 1987, the emulsifiable concentrate formulation of dithiopyr at 0.56 kg/ha provided complete control of crabgrass throughout the growing season. Quality of bluegrass was excellent even with 1.68 kg/ha dithiopyr. During the fall of 1987, an area for the second experiment was seeded and carried to 97% or more groundcover in April before the 1988 treatments were applied. With excellent groundcover with bluegrass, low populations of crabgrass were encountered during 1988 (a few plants per m2). Very little effect on quality or groundcover was obtained with dithiopyr at 0.56 kg/ha or below; however, at 1.12 kg/ha of this chemical the quality and groundcover with bluegrass were below the acceptable levels for lawns (35% open area in cover). This injury was long term lasting throughout the summer. In the 1988 Postemergence study, early treatment of young crabgrass was important for adequate control. The control of young crabgrass was about equal with dithiopyr at 0.56 kg/ha and fenoxaprop at 0.14 kg/ha. Older more mature crabgrass was controlled better with fenocaprop at 0.28 kg/ha than with dithiopyr at 1.13 kg/ha. In 1989, heavy populations of crabgrass were obtained in the bluegrass by adding a vertical mowing and seeding with crabgrass at a good time for emergence. The prior studies had received crabgrass seed during March or April but not a vertical mowing to open the turfgrass for space to grow. After crabgrass emergence, the bluegrass was managed normally. Comparisons of dithiopyr formulations tended to show that less active ingredient was required for excellent crabgrass control with granular as opposed to emulsifiable concentrate formulations. In 1989, three experiments were conducted with application dates as follows: April 14, June 23 and July 7. Dithiopyr (0.56 kg/ha) provided excellent control of crabgrass except for the July 7 application. In this study, fenoxaprop at 0.18 kg/ha provided excellent control and a mixture of dithiopyr and fenoxaprop gave complete crabgrass control with high quality bluegrass. The combination with MSMA appeared to be slightly less effective for crabgrass control at this stage. Dithiopyr was effective for selective crabgrass control in established bluegrass at rates of 0.43 to 0.84 kg/ha. The granular formulations required the least active ingredient for acceptable crabgrass control. The time of application was excellent during the first month of crabgrass germination. Older more mature crabgrass was not controlled as well as with fenoxaprop."
Language:English
References:0
Note:"Risk/benefit: A way of life"
This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Bingham, S. W., R. L. Shaver, and D. G. Bingham. 1990. Crabgrass susceptibility to dithiopyr in turfgrass. South. Weed Sci. Soc. Proc. 43:p. 154-155.
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