Full TGIF Record # 83647
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Publication Type:
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Report
Content Type:Abstract or Summary only
Author(s):Waltz, F. C. Jr.; Murphy, T. R.; Higingbottom, J. K.; Estes, A. G.; McCarty, L. B.
Author Affiliation:University of Georgia, Griffin, Georgia, and Clemson University, Clemson, South Carolina
Title:Warm-season turfgrass renovation using roundup pro and tillage combinations
Section:Weed management in turf, pasture, and rangeland
Other records with the "Weed management in turf, pasture, and rangeland" Section
Meeting Info.:55th Annual Meeting, Atlanta, GA: January 28-30, 2002
Source:Southern Weed Science Society Proceedings. Vol. 55, 2002, p. 65.
Publishing Information:Champaign, IL: Southern Weed Science Society.
# of Pages:1
Abstract/Contents:"Weedy grass species like common bermudagrass (Cynodon sp.), a warm-season perennial that reproduces by seed, stolons, and rhizomes, is difficult to selectively control in other warm-season turfs like hybrid bermudagrass (Cynodon dactylon X C. transvaalensis) and zoysiagrass (Zoysia sp.). Common Bermudagrass is common in the Southeastern United Sates and is has been used along roadsides, as a forage, for soil stabilization, and a fine turf. However, due to its coarse texture and intolerance to low mowing heights, common bermudagrass is not a desirable species for golf course fairways. Likewise, bermudagrass is a common weed in zoysiagrass sod fields and home lawns. Two field experiments were initiated to evaluate various rates of Roundup Pro (glyphosate) and tillage combinations for long term control of bermudagrass and efficacy on reestablishment of other turfgrass species into previously infested areas. Study 1 was conducted at the turfgrass research facility at Clemson University, Clemson, South Carolina. The study was established in a five-year old stand of an off-type hybrid bermudagrass. Plots were 2 m x 5 m in a randomized complete block design with 3 replications. Using a CO2 backpack sprayer set to deliver 187 1 ha-1, initial postemergence treatments were applied beginning on May 26, 2001. Treatments were based on four tillage and sprigging regimes. Regime A consisted of tilling and sprigging the treated area 10 days after initial herbicide application. Treatments consisted of a single application of Roundup Pro at 5.6 kg ai ha-1 and Roundup Pro at 4.5 kg ai ha-1 with a sequential 4.5 kg ai ha-1 application 72 hours later. The first treatment in regime B cnsisted of 2 applications of Roundup Pro at 4.5 kg ai ha-1 with the second application 31 days following the initial. Plots were tilled and sprigged 7 days following the sequential application. The second treatment in regime B used the same rates and timings, but plots were tilled after the first application and tilled and sprigged following the second application. All plots in regime C were tilled and sprigged following the last herbicide appication. The first treatment consisted of three applications of Roundup Pro at 2.2 kg ai ha-1 spaced 31 and 21 days apart. In the second treatment, Roundup Pro was applied at 3.5 kg ai ha-1 followed by 2.2 kg ai ha-1 at 31 days after initial and 2% v/v 21 days later. Similarly, the third treatment used the same timings but Fusilade II (fluazifop) at 0.4 kg ai ha-1 was tank mixed with the Roundup Pro at 2.2 kg ai ha-1 for the first two applications. Plots in regime D were tilled 10 days following each of 3 Roundup Pro applications (3.4 kg ai ha-1, 2.2 kg ai ha-1, and 2% v/v, respectively). Plots were sprigged 7 after the last application. Fresh sprigs were cut on the day of sprigging from a known stand of `Tifway' bermudagrass and applied at 1 bushel 100 ft-2. Sprigs were applied, rolled to ensure good soil contact, watered, and fertilized (3 applications totalling 49 kg N ha-1). Study 2 was initiated July 9, 2001 at the University of Georgia Griffin Campus on an established stand of common bermudagrass. Tillage and sprigging regimes, along with herbicide rates, were identical to study 1. However, plots were reestablished with zoysiagrass sod and the spray volume increased to 234 1 ha-1. For both studies, an untreated control was included and ratings for visual bermudagrass control were made on a 0% to 100% scale, 0%=no control, and 100%= complete control, 80% control was considered minimally acceptable. In both studies, acceptable (> 80%) bermudagrass control was observed 10 days after initial treatment (DAIT) for plots treated with Roundup Pro at the 5.6 and 4.5 kg ai ha-1 rates. In the Clemson study, the 3.5 kg ai ha-1 provided acceptable control, also. A similar trend was observed at 40 DAIT with plots treated with the Fusilade / Roundup Pro tank mix providing 90 and 88% control at the Clemson and Georgia locations respectively. Herbicide application did not appear to inhibit turfgrass establishment at either site. From these studies, it appears for effective control of bermudagrass, multiple applications will be necessary and Roundup Pro at 4.5 kg ai ha-1 is needed for acceptable, long-term control. However, evaluation of spring green-up is forthcoming and turfgrass established later in the summer following multiple applications may be less vigorous and more susceptible to winter injury. Future studies may evaluate the effectiveness of these programs based on the age of established bermudagrass and the application of a Roundup Pro treatment the fall preceding the next year's summer establishment."
Language:English
References:0
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Waltz, F. C. Jr., T. R. Murphy, J. K. Higingbottom, A. G. Estes, and L. B. McCarty. 2002. Warm-season turfgrass renovation using roundup pro and tillage combinations. South. Weed Sci. Soc. Proc. 55:p. 65.
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