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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Prinster, M. G.;
McQueen, R. D. |
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| Author Affiliation: | TruGreen ChemLawn, Douglasville, GA |
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| Title: | Alternative crabgrass (Digitaria spp.) control strategies for southern lawns utilizing quinclorac and several preemergent herbicides |
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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.: | 54th Annual Meeting, Biloxi, Mississippi: January 22-24, 2001 |
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| Source: | Southern Weed Science Society Proceedings. Vol. 54, 2001, p. 70. |
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| Publishing Information: | Champaign, IL: Southern Weed Science Society. |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Crabgrass control; Quinclorac; Preemergence herbicides; Festuca arundinacea; Cynodon dactylon; Digitaria ischaemum; Digitaria ciliaris; Application rates; Pendimethalin; Prodiamine; Dithiopyr; Herbicide injury; Herbicide resistance; Chlorosis; Herbicide combinations
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| Cultivar Names: | K-31 |
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| Geographic Terms: | Southern United States |
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| Abstract/Contents: | "Crabgrass is an aggressive annual weed that thrives in home lawns in the southern United States. Sequential applications of preemergent herbicides are commonly used by lawn care operators (LCOs) to control crabgrass in warm and cool season lawns. Quinclorac is a new herbicide that has postemergent activity on crabgrass. These studies were designed to evaluate the use of quinclorac in combination with several preemergent herbicides to determine if alternative, more flexible application strategies would provide a desirable level of crabgrass control - especially for accounts sold late in the season. Two field experiments were conducted in 1999 in Douglasville, GA on 'K-31' tall fescue and common bermudagrass. The sites chosen for these studies historically had a very high population of smooth (Digitaria ischaemum) and southern (Digitaria ciliaris) crabgrass. Three treatment strategies were evaluated on these turfs: Strategy 1 - standard sequential preemergent applications made on March 13 + May 10. Herbicides and rates (lb ai/A) were: pendimethalin 1.5 + 1.5, prodiamine 0.38 + 0.38, dithiopyr 0.25 + 0.25 and quinclorac 0.75 + 0.75. Strategy 2 - a pre-postemergent herbicide mix applied on May 10 at 2-3 leaf stage of crabgrass followed by a postemergence application on July 14. Treatments included pendimethalin 1.5 + quinclorac 0.75 followed by quinclorac 0.75 alone, prodiamine 0.38 + quinclorac 0.75 followed by quinclorac 0.75 alone and dithiopyr 0.25 + quinclorac 0.75 followed by quinclorac 0.75 alone. Strategy 3 - a one-time pre-postemergence application made on May 10. These treatments included pendimethalin 2.0 + quinclorac 0.75, prodiamine 0.5 + quinclorac 0.75, and dithiopyr 0.38 + quinclorac 0.75. Treatments were applied with a CO2 pressurized sprayer equipped with TeeJet 8004 LP flat fan nozzles calibrated to deliver 87 GPA. Turf injury was observed for several weeks following each application and crabgrass control was rated in July, August and September. Tall fescue results: Pendimethalin, prodiamine and dithiopyr caused no injury to tall fescue, however the May and July applications of quinclorac caused some degree of turf injury. Generally, the warmer the soil temperature the greater the injury to tall fescue. The July application caused marginally unacceptable turf injury (>30%). Injury was expressed as a slight chlorosis and an overall limp appearance of the turf. At the July 13 crabgrass control rating all sequentially applied preemergence herbicides (Strategy 1) gave commercially acceptable crabgrass control (>80%) but by Aug. 6 prodiamine was the only product that provided acceptable results. By Sept. 1 none of these Strategy 1 treatments gave commercially acceptable crabgrass control. Summer stresses caused a gradual decline in the tall fescue canopy and an overall reduction in competition to the crabgrass. All Strategy 2 pre-postemergence applications (May 10) that were followed by a July 14 application of quinclorac gave excellent season-long results regardless of the preemergence herbicide used. All one-time pre-postemergence applications (Strategy 3) failed to provide acceptable crabgrass control through August. Bermudagrass results: Common bermudagrass was quit tolerant to pendimethalin, prodiamine and dithiopyr but was injured by all quinclorac applications. Bermudagrass initially turned chlorotic followed by purple leaf banding 1-2 weeks later. Injury was considered unacceptable (>40%) at the May and July application timing. All three application strategies provided excellent crabgrass control (>90%) in common bermudagrass regardless of the preemergence herbicide that was used. Pendimethalin, prodiamine and dithiopyr provided similar results whether sequentially applied alone or in combination with quinclorac. Sequential applications of quinclorac also gave acceptable results. Bermudagrass was very aggressive during summer months and once the initial population of crabgrass was eliminated, turf competition helped to prevent a secondary infestation." |
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| Language: | English |
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| References: | 0 |
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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):
Prinster, M. G., and R. D. McQueen. 2001. Alternative crabgrass (Digitaria spp.) control strategies for southern lawns utilizing quinclorac and several preemergent herbicides. South. Weed Sci. Soc. Proc. 54:p. 70. |
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