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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Kelly, S. T.;
Coats, G. E. |
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| Author Affiliation: | Kelly: LSU Agricultural Center, Louisiana State University, Winnsboro, LA; Coats: Mississippi State University, Mississippi State, MS |
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| Title: | PRE southern crabgrass control with herbicide combinations |
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| Section: | Section II: Weed management in turf, pasture and rangeland
Other records with the "Section II: Weed management in turf, pasture and rangeland" Section
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| Meeting Info.: | 53rd Annual Meeting, Tulsa, OK, January 24-26, 2000 |
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| Source: | Southern Weed Science Society Proceedings. Vol. 53, 2000, p. 48-49. |
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| Publishing Information: | Champaign, IL: Southern Weed Science Society. |
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| # of Pages: | 2 |
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| Keywords: | TIC Keywords: Preventive control; Preemergence herbicides; Broadleaf weed control; Digitaria ciliaris; Cynodon dactylon; Preemergence weed control; Dithiopyr; Oxadiazon; Fertilizer carriers; Application rates; Split applications; Quinclorac; MSMA; Herbicide evaluation; Herbicide combinations; Granular fertilizers; Growth stages
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| Abstract/Contents: | "Three experiments were conducted in 1998 or 1999 to evaluate herbicide combinations for PRE control of southern crabgrass (Digitaria ciliaris). All experiments were conducted at the Plant Science Research Center near Starkville, MS on a common bermudagrass turf overseeded with southern crabgrass immediately after initiation. All granular treatments were applied using a box containing seven layers of 0.25 inch hardware cloth spaced 6 inches apart, which was placed over the plot and the pre-weighed quantity sprinkled over the box using a shaker jar. All sprayable treatments were applied using a CO2 powered backpack sprayer calibrated to deliver 25 gallons per acre. Experimental design was a randomized complete block with five replicates. Southern crabgrass control was evaluated monthly fromJune [from June] through September. The first experiment was conducted to evaluate combinations of dithiopyr and oxadiazon. Treatments include dithiopyr (0.25%) on a fertilizer carrier (40-0-0, N-P-K) at 0.375 lb ai/A, and 0.375 fb 0.375 lb/A 60 days after the initial application (DAIT), dithiopyr + oxadiazon (0.13 + 0.54%, respectively) applied at two rates (0.3 + 1.25 lb ai/A, or 0.38 + 1.5 lb ai/A). These treatments were compared to a single application of oxadiazon (2% granule) at 3.0 lb ai/A, and a split application of 1.5 fb 1.5 lb/A 60 DAIT. From 161 to 190 DAIT, both treatments containing dithiopyr + oxadiazon, or 0.375 lb/A dithiopyrapplied [dithiopyr applied] Pre and DAIT, controlled southern crabgrass equally (at least 75%). A single application of dithiopyr or either oxadiazon treatment controlled southern crabgrass 75% or less from 133 to 190 DAIT. Results from this experiment indicate that combining dithiopyr and oxadizon [oxadiazon] increased southern crabgrass control over either herbicide alone at the rates evaluated in this experiment. The second experiment evaluated dithiopyr (0.164%) on a fertilizer granule (40-0-0, N-P-K) at 0.375 lb/A, dithiopyr + quinclorac (0.375 + 0.75 lb ai/A) on a fertilizer carrier, and a comparison treatment of MSMA + dithiopyr (2.0 + 0.375 lb/A) fb MSMA (2.0 lb/A), 7 days later. Each treatment was applied to southern crabgrass at two growth stages: 2 to 3 leaf, and 1 to 2 tiller and larger. Dithiopyr alone controlled southern crabgrass at least 85% for the duration of the experiment when applied to plants in the 2 to 3 leaf stage. However, when applied to plants that had tillered, control was less than 65%. Dithiopyr + quinclorac controlled plants in the 2 to 3 leaf stage less than 55% at any point during the experiment, however, if plants had tillered, control ranged from 85 to 75% during the experiment. The comparison treatment containing MSMA controlled either stage of southern crabgrass at least 77% throughout the experiment. Experiment three was also conducted to evaluate combinations for controlling southern crabgrass at different growth stages: 2 to 3 leaf, 1 to 2 tiller, and 2 tiller and larger. Treatments included: dithiopyr (0.164% or 0.25%) on a fertilizer carrier (40-0-0, N-P-K) at 0.25, 0.375 or 0.5 lb/A, and two combination products of dithiopyr + quinclorac (0.18 or 0.27%) at 0.25 + 0.75 or 0.375 + 0.75 lb/A, respectively. Dithiopyr at 0.375 lb/A or less controlled 2 to 3 leaf southern crabgrass 68% or less throughout the experiment, while 0.5 lb/A controlled 2 to 3 leaf southern crabgrass 82% at 44 DAIT, but control declined to 40% and less through the remainder of the experiment. If dithiopyr applications were delayed until plants had tillered, poor control (less than 48%) was observed. While the addition of quinclorac to dithiopyr enhanced initial control of tillered plants, control declined quickly." |
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| Language: | English |
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| References: | 0 |
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| See Also: | Other items relating to: M S M A |
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| Note: | This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Kelly, S. T., and G. E. Coats. 2000. PRE southern crabgrass control with herbicide combinations. South. Weed Sci. Soc. Proc. 53:p. 48-49. |
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