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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Ducar, J. Tredaway;
Dinkins, D. A.;
Dollar, K. K.;
Andreason, A. M.;
Wasdin, J. W. |
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| Author Affiliation: | Ducar: Agronomy Department, Gainesville; Dinkins: Bradford County Extension, Starke; Dollar: Clay County Extension, Green Cove Springs; Andreason: Washington County Extension, Chipley; and Wasdin: Animal Science Department, University of Florida, Gainesville, Florida |
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| Title: | Evaluation of imazapic for grass control in bermudagrass hayfields and pastures |
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| Section: | Weed management in turf, pasture, and rangeland
Other records with the "Weed management in turf, pasture, and rangeland" Section
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| Meeting Info.: | 55th Annual Meeting, Atlanta, GA: January 28-30, 2002 |
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| Source: | Southern Weed Science Society Proceedings. Vol. 55, 2002, p. 45-46. |
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| Publishing Information: | Champaign, IL: Southern Weed Science Society. |
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| # of Pages: | 2 |
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| Abstract/Contents: | "Experiments were conducted in three Florida locations to determine the efficacy of imazapic on vaseygrass (Paspalum urvelli), sandbur (Cenchrus spp.), and johnsongrass (Sorghum halepense) and to evaluate tolerance of coastal bermudagrass (Cynodon dactylon) to imazapic. All experiments utilized a randomized complete block design with 3 or 4 replications. Herbicide treatments were applied with a C02 backpack sprayer with Turbo Teejet 03 nozzles at 20 GPA. The first study was conducted to determine if vaseygrass control would be enhanced if applied in a liquid nitrogen carrier. Plateau (imazapic) was applied at 4, 6, and 8 fl. oz/A in liquid nitrogen and water carriers. A non-ionic surfactant was included at 0.25% v/v. Treatments were applied after a hay cutting when the coastal bermudagrass was 8 inches tall and vaseygrass was 6 to 8 inches tall. The second study was conducted to determine the best rates and timings of Oasis (imazapic + 2,4-D ester) for johnsongrass control. Treatments included Oasis at 4, 6, 8, 10, and 12 fl. oz/A and Roundup UltraMax at 51 fl. oz/A. All treatments were applied Pre-bloom and Post-bloom. The third study was conducted to determine the efficacy of imazapic on sandbur. Oasis was applied at 4, 6, 8, 10, and 12 fl. oz/A, Plateau at 8 fl. ozA, and Plateau (8 fl.oz/A) + Ally (metsulfuron)(0.3 oz/A). In the first study, vaseygrass control exceeded 90% regardless of rate or carrier at 39 DAT (days after treatment). Control remained >88% at 53 DAT with all treatments except Plateau applied at 4 fl. oz/A in water. Bermudagrass injury was <10% at 39 DAT and with all rates of Plateau applied in water or Liquid nitrogen. No bermudagrass injury was present at 53 DAT. In the second study, Oasis applied pre-bloom provided 30 - 58% control of johnsongrass 28 DAIT (days after initial treatment) with the greatest amount of control resulting from the highest application rates of 10 and 12 fl. oz/A. Roundup UltraMax provided > 90% johnsongrass control. Pre-bloom applications of Oasis controlled johnsongrass 80% or greater with all rates except 5 fl.oz/A 28 DAIT. Roundup UltraMax declined to 60% 28 DAIT. Pre-bloom Oasis treatments controlled johnsongrass >85% at all applications rates 42 DAIT compared to Roundup UltraMax at <60%. Post-bloom treatments of Oasis (at all rates) and Roundup UltraMax exceeded 80%. At 73 DAIT, all Oasis treatments controlled johnsongrass >80% pre- and post-bloom, regardless of rate. Roundup UltraMax control was <10% and 80% applied pre-bloom and post-bloom, respectively. Bermudagrass injury was <10% for all Oasis treatments and >90% for Roundup UltraMax at 73 DAIT, regardless of timing. In the third study, sandbur was controlled >80% with oasis at 4, 6, and 10 fl.oz/A 30 DAT. All other treatments provided < 60% sandbur control. At 60 DAT, oasis at 4 fl.oz/A provided >90% control. Oasis at any other rate or combination controlled sandbur <75%. In conclusion, Plateau controlled vaseygrass >90% regardless of carrier or rate. Johnsongrass was controlled >80% with all Oasis rates applied pre-bloom, while all post-bloom treatments provided >88% control. All Oasis rates were more effective than Roundup UltraMax. Sandbur control varied depending on the density. In a heavy infestation, the 6 fl.oz rate is necessary to provide good control (>80%); in a lighter infestation, the 4 fl.oz rate provides good sandbur control." |
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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):
Ducar, J. T., D. A. Dinkins, K. K. Dollar, A. M. Andreason, and J. W. Wasdin. 2002. Evaluation of imazapic for grass control in bermudagrass hayfields and pastures. South. Weed Sci. Soc. Proc. 55:p. 45-46. |
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MSU catalog number: SB 611 .S6 v.54 |
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