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| Web URL(s): | http://www.swss.ws/wp-content/uploads/docs/2003%20Proceedings-SWSS.pdf#page=327
Last checked: 07/16/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Author(s): | Burnell, K. D.;
Byrd, J. D. Jr. |
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| Author Affiliation: | Mississippi State University, MS |
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| Title: | Can various application methods improve cogongrass [Imperata cylindriva (L.) Beauv.] control? |
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| Section: | Soil and environmental aspects of weed science
Other records with the "Soil and environmental aspects of weed science" Section
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| Meeting Info.: | Houston, Texas: January 27-29, 2003 |
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| Source: | Proceedings: Southern Weed Science Society: 56th Annual Meeting. Vol. 56, 2003, p. 240. |
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| Publishing Information: | Champaign, Illinois: Southern Weed Science Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Application methods; Application rates; Glyphosate; Herbicide application; Herbicide evaluation; Imperata cylindrica; Weed control
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| Abstract/Contents: | "Two field studies were conducted during 2002 at three locations, Grand Bay Wildlife Refuge (GBWR) and Morgan in south MS, and at Preston located in central Mississippi. The objectives were to determine if 1) glyphosate applied in a single application or sequentially up to 4 times at reduced rates of 1 and/or 2.5 qt/A provided equivalent control to higher rates of 5 qt/A for cogongrass control and 2) a single application of selected herbicides in increased spray volumes applied to burned or natural stands will influence cogongrass control. Treatments for test 1 were a 3 by 4 factorial plus a check, arranged in a RCB with three replications. Treatments for test 1 included: 0, 1, 2.5, and 5 qt/A of Roundup Pro 4L and were initially applied March 12 to 36 to 40 inch tall cogongrass which was 36 to 40 in tall, then sequentially at monthly intervals through June. Visual control data were taken and analyzed monthly until dormancy and presented as days after initial treatment (DAIT) and days after final application (DAFA). Treatments for test 2 included: Arsenal 2AS at 16 fl oz/A, Roundup Pro 4L and Touchdown 3L at 128 fl oz/A, Asulox 3.34L at 192 fl oz/A, Dowpon 85WG at 4 lbs/ A, and Hyvar 2L at 64 fl oz/A. Treatment design was a 6 by 3 factorial arranged in a RCB with 3 replications with stand type being on location, either intact at Preston or burned at GBWR. Cogongrass was burned on May 3 at GBWR and treatments were applied to 12 in regrowth on June 6 at GBWR and to 24 to 36 inch tall stands at Preston on June 7. Treatments were applied in plots 6 by 15 ft, using a CO2 pressurized backpack equipped with either 4 nozzle boom sprayer delivering 20 or 40 GPA with 8002 or 04XR nozzle tips or an 8 nozzle boom to deliver 80 GPA at 40 PSI with 8008XR tips. Results for test 1 indicated control was comparable 120 days after initial treatment (DAIT) with between 87 to 98% with 3 or 4 applications (x) of 2.5 or 5 qt/A or 4x of 1 qt/A. By 175 DAIT, only 4x or 2.5 or 5 qt/A provided similar control with 88 and 94%. Control with all treatments was less than 75% 210 DAIT. From these data, control in day after final application (DAFA) was determined. All rates (1, 2.5 and 5 qt/A) applied 4x and 2.5 and 5 qt/A applied 2x or 3x provided above 90% control 30 DAFA. All 1 qt/A treatments provided less than adequate control below 77%, 60 DAFA. In addition, 60 DAFA, only 2.5 and 5 qt/A applied 2 or more times provided between 87 and 93% control. By 90 DAFA, control ranged between 86 and 94% with 5 qt/A applied 3x or 4x or 2.5 qt/A applied 4x. Control by any treatment was less than 75% 120 DAFA. Results for test 2 suggested that Roundup Pro and Touchdown applied at 128 fl oz/A were the most effective and consistent chemicals evaluated, with better that 90% control seen 60 DAIT and beyond irrespective of GPA or stand type (burned or natural). Control with Arsenal of 80 and 90% was achieved sooner (60 or 90 DAIT) on burned stands compared to 150 DAIT on natural stands. Averaged over treatments and replications, control with 20 GPA was better than 80 GPA. Overall, Roundup Pro and Touchdown were the most effective and consistent chemicals evaluated, with better than 90% control 60 DAIT and beyond, regardless GPA or stand type (burned or natural). Dowpon and Asulox control was inconsistent and Hyvar was ineffective. Conclusions from objective 1 suggest multiple applications are needed, lower use rates of 1 or 2.5 qt/A control were comparable to 5 qt/A applied multiple times, and each additional application provided about 30 days additional control beyond the previous application. Objective 2 data suggested that increased control was seen with applications made to regrowth (burned) stands compared to natural stands. Also, control with a 20 GPA spray volume was better than 80 GPA. Overall, Roundup Pro and Touchdown were the most effective and consistent chemicals evaluated, with better that 90% control seen 60 DAIT and beyond irrespective of GPA or stand type (burned or natural)." |
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| Language: | English |
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| References: | 0 |
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| Note: | "Invasive weeds: Real or imagined threat?"
This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Burnell, K. D., and J. D. Jr. Byrd. 2003. Can various application methods improve cogongrass [Imperata cylindriva (L.) Beauv.] control?. South. Weed Sci. Soc. Proc. 56:p. 240. |
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| Web URL(s):
http://www.swss.ws/wp-content/uploads/docs/2003%20Proceedings-SWSS.pdf#page=327
Last checked: 07/16/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: b2207931 |
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