Full TGIF Record # 73913
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Publication Type:
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Report
Content Type:Abstract or Summary only
Author(s):Cox, C. J.; McCarty, L. B.; Higingbottom, J. K.
Author Affiliation:Department of Horticulture, Clemson University, Clemson, SC
Title:Envoy (clethodim) for bermudagrass control and centipedegrass tolerance
Section:Section II: Weed management in turf, pasture and rangeland
Other records with the "Section II: Weed management in turf, pasture and rangeland" Section
Meeting Info.:53rd Annual Meeting, Tulsa, OK, January 24-26, 2000
Source:Southern Weed Science Society Proceedings. Vol. 53, 2000, p. 53-54.
Publishing Information:Champaign, IL: Southern Weed Science Society.
# of Pages:2
Keywords:TIC Keywords: Clethodim; Bermudagrass control; Eremochloa ophiuroides; Weed control; Sod; Sod industry; Cynodon dactylon; Sethoxydim; Application rates; Application timing; Spring green-up; Surfactants; Weed resistance to herbicides
Abstract/Contents:"Bermudagrass is a problematic weed for sod producers in the Southern United States. A two-yearstudy [year study] was conducted to evaluate the efficacy ofEnvoy [of Envoy] 0.94 EC for bermudagrass (Cynodon dactylon) controland [control and] centipedegrass (Eremochloa ophioroides) tolerance. The study was conducted on a commercial sod operation in Orangeburg, South Carolina. The primary objective for the study during year one was to determine the effective usage of surfactants in correlation with Envoy at three different rates, (17, 34, and 68 oz/A) comparing each rate with Vantage (1 EC) at 36 oz/A, which had been the industry standard. During year two, best application timings using the three most effective rates from year one, with treatments applied pre and post-greenup of the turf were examined. Treatments applied at greenup were sprayed on May 7, 1999. The 17oz/A [17 oz/A] rate at greenup continued for three additional applications (May 23, June 11, July 3), while the 34 oz/A rate sprayed on May 23 with one additional application June 11. Also on May 23, the post-greenup treatments were applied, with the 17 oz/A rate continuing for three additional applications, ending July 25. The 34 oz/A post-green-up treatment was also applied initially on May 23 with one additional application on June 11. Vantage was also applied post-greenup, with the initial application occurring on May 23, with one additional treatment applied June 11. Treatments were applied to 10 x 10 foot plots of centipedegrass naturally infested with bermudagrass. Threereplications [Three replications] ofeach [of each] treatment were rated on the basis of visual bermudagrass control (%) and centipede grass injury (%). An arbitrary value of 30% was used for maximum commercially acceptable centipedegrass injury. Treatments were applied using a CO2 backpack sprayer calibrated at 20gal/A [20 gal/A] and fitted with 8003 flat fan tips. All final ratings occurred on September 8, 1999. In 1998, eight treatments were studied to determine their effectiveness with the addition of non-ionic or crop oil surfactants. Overall best treatments were two applications of Envoy (with Dash surfactant) at rates of 34 oz/A and 68 oz/A. Both treatments provided >85% control. Although the 68 oz/A rate incurred some injury to the centipedegrass (13%), the turf fully recovered within four weeks. In 1999, best results occurred using repeat applications of Envoy at 17 oz/A with 1% v/v crop oil surfactant. Four applications of Envoy applied at green-up provided 87% control with 0 centipedegrass injury. Envoy at 17 oz/A, applied four times post-greenup, provided 85% control of bermudagrass and 0 injury to centipedegrass. Envoy treatment at 34 oz/A applied during green-up provided only 18% bermudagrass control. When applied post-greenup, the 34 oz/A rate provided 65% bermudagrass control with 12% injury to centipedegrass after the second application. Within one month the centipedegrass had fully recovered. Vantage provided <40% control of bermudagrass and <2% injury to centipedegrass. In conclusion, four applications of Envoy at a rate of 17 oz/A, using a crop oil surfactant provided the best bermudagrass control without any injury to the centipedegrass turf either during or post-greenup. Vantage, the industry standard for bermudagrass control, proved to be ineffective when applied post-greenup."
Language:English
References:0
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Cox, C. J., L. B. McCarty, and J. K. Higingbottom. 2000. Envoy (clethodim) for bermudagrass control and centipedegrass tolerance. South. Weed Sci. Soc. Proc. 53:p. 53-54.
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MSU catalog number: SB 611 .S6 v.52
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