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| DOI: | 10.21273/HORTSCI.47.3.434 |
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| Publication Type:
| Refereed |
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| Author(s): | Hephner, Andrew J.;
Cooper, Tyler;
Beck, Leslie L.;
Henry, Gerald M. |
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| Author Affiliation: | Department of Plant and Soil Science, Texas Tech University, Lubbock, TX |
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| Title: | Sequential postemergence applications for the control of khakiweed in bermudagrass turf |
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| Source: | HortScience. Vol. 47, No. 3, March 2012, p. 434-436. |
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| Publishing Information: | Alexandria, Virginia: American Society for Horticultural Science |
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| # of Pages: | 3 |
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| Keywords: | TIC Keywords: Alternanthera pungens; Carfentrazone; Cynodon dactylon; Herbicide trials; Metsulfuron + carfentrazone; Phytotoxicity; Trifloxysulfuron; Weed control
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| Abstract/Contents: | "Khakiweed (Alternanthera pungens Kunth) response to single and sequential herbicide applications was evaluated during the summer of 2009 and 2010 in Texas. No bermudagrass phytotoxicity was observed throughout the length of each trial regardless of herbicide treatment. Carfentrazone at 0.034 kg a.i./ha, metsulfuron + carfentrazone at 0.021 + 0.034 kg a.i./ha, and trifloxysulfuron + carfentrazone at 0.018 + 0.034 kg a.i./ha exhibited 74% to 85% khakiweed control 2 weeks after initial treatment (WAIT) regardless of application regime. Control with carfentrazone (0.017 kg a.i./ha) was only 63% to 65% 2 WAIT regardless of application regime. Metsulfuron and trifloxysulfuron treatments exhibited 54% or less khakiweed control 2 WAIT regardless of rate. Six weeks later (8 WAIT), sequential applications of metsulfuron exhibited 98% control regardless of rate, whereas control with single applications was 79% to 87%. Sequential applications of trifloxysulfuron exhibited 86% to 88% khakiweed control 8 WAIT regardless of rate, whereas single applications exhibited 47% or less control. Carfentrazone treatments exhibited 5% or less control regardless of rate or sequential application 8 WAIT. Tank-mixing metsulfuron or trifloxysulfuron with carfentrazone did not improve control 8 WAIT compared with either sulfonylurea herbicide applied alone. Although initial khakiweed injury was observed in all treatments, effective long-term control was difficult to achieve. Excellent control (95% to 97%) was exhibited by sequential metsulfuron applications 12 WAIT regardless of rate. Sequential applications of trifloxysulfuron (0.018 or 0.028 kg a.i./ha) and single applications of metsulfuron at 0.042 kg a.i./ha exhibited moderate khakiweed control (75% to 80%) 12 WAIT. All other treatments exhibited 57% or less khakiweed control 12 WAIT. Efficacy of sequential metsulfuron applications is a strong incentive for its adoption over trifloxysulfuron applications for the control of khakiweed in bermudagrass turf." |
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| Language: | English |
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| References: | 25 |
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| Note: | Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Hephner, A. J., T. Cooper, L. L. Beck, and G. M. Henry. 2012. Sequential postemergence applications for the control of khakiweed in bermudagrass turf. HortScience. 47(3):p. 434-436. |
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| DOI: 10.21273/HORTSCI.47.3.434 |
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MSU catalog number: b2217685a |
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