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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Belcher, J. L.;
Grey, T. L.;
Walker, R. H.;
Wehtje, G. R. |
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| Author Affiliation: | Alabama Agricultural Experiment Station, Auburn University, Auburn, AL 36849 |
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| Title: | Response of yellow (Cyperus esculentus) and purple ( C. rotundus) nutsedge to sulfentrazone |
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| Meeting Info.: | 50th Annual Meeting, Houston, TX, January 20-22, 1997 |
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| Source: | Southern Weed Science Society Proceedings. Vol. 50, January 1997, p. 74. |
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| Publishing Information: | Champaign, IL: Southern Weed Science Society. |
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| # of Pages: | 1 |
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| Abstract/Contents: | "The authors have previously shown that sulfentrazone sorption and mobility is influenced by soil pH. As pH increased, sorption decreased and mobility increased over four soils and four pH levels that ranged from approximately 4.5 to 7.5. Greenhouse experiments examined the effectiveness of PRE- and POST-applied sulfentrazone in controlling purple (CYPRO) and yellow (CYPES) nutsedge as influenced by selective tissue exposure. Consistent control with PRE applications to germinating tubers was obtained with a combined root- and shoot-zone exposure. POST-foliar applications to established nutsedge was more effective when sulfentrazone was allowed to contact both foliage and soil. CYPES was more susceptible than CYPRO. C-sulfentrazone was readily absorbed by the roots, and translocated to the foliage of both nutsedge species in hydroponic culture. However, CYPRO preferentially absorbed the anionic form (pH above pKa) of sulfentrazone. Sulfentrazone absorption by CYPES was not influenced by ionic form. Field experiments with bermudagrass (Cynodon dactylon 'Tifway') turf were conducted to determine if liming prior to PRE- or POST-applied sulfentrazone would affect CYPRO or CYPES control. Sod plugs (4 cm by 4 cm) were removed and 5 CYPES nutlets or CYPRO tubers were planted in separate hills. There were 7 hills of each spiecies/plot in the PRE study and 5 hills of each in the POST study. Lime was applied at 3360 kg ha⁻^D] 1 after nutsedge planting. Initial soil pH for the PRE study was 5.5; and a pH of 6.6 for the POST study. Sulfentrazone was applied PRE on 4/17/96 and POST 1 on 6/21/96 and POST 2 7/23/96. Sulfentrazone rates ranged from 0.14 to 0.56 kg ha⁻^D1 applied in either one or two applications using the 80 WP formulation. Yellow nutsedge control was initially slightly increased by lime in the PRE study but the effect diminished with time. The 0.2 granular formulation provided better nutsedge control than the 80 WP. However, control was poor by 82 days after application (DAA). CYPES was more sensitive to sulfentrazone than CYPRO. Bermudagrass exhibited excellent tolerance to PRE-applied sulfentrazone. Lime had no effect on CYPES control in the POST study but did decrease control of CYPRO. Halosulfuron provided good mid-season control of CYPRO but poor control 89 DAA. Bermudagrass showed slight chlorosis for approximately 1 week after each POST application but overall tolerance was good." |
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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):
Belcher, J. L., T. L. Grey, R. H. Walker, and G. R. Wehtje. 1997. Response of yellow (Cyperus esculentus) and purple ( C. rotundus) nutsedge to sulfentrazone. South. Weed Sci. Soc. Proc. 50:p. 74. |
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MSU catalog number: SB 611 .S6 v. 50 |
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