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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Coats, G. E. |
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| Author Affiliation: | Dept. of Plant Pathology and Weed Science, Mississippi State University, Mississipi State, MS. |
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| Title: | Weed Control in Warm Season Turfgrasses with Imidazolinone Herbicides |
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| Meeting Info.: | Held: January 14-16, 1985, Houston, TX. |
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| Source: | Proceedings of the 38th Southern Weed Science Society. Vol. 38, 1985, p. 97. |
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| Publishing Information: | Southern Weed Science Society |
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| Keywords: | TIC Keywords: Weed control; Warm season turfgrasses; Imidazolinone herbicides; Herbicides; Herbicide resistance; Cynodon dactylon; Eremochloa ophiuroides; Stenotaphrum secundatum; Zoysia; Diodia virginiana; Cyperus rotundus; Phenoxy-type herbicides; Bentazon; Application rates; Application timing; Herbicide rates; CMA
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| Abstract/Contents: | "Experiments were conducted during 1984 to evaluate the efficacy of imazaquin, AC 214,925, and AC 214,278 and to establish tolerance of warm season turfgrasses to these herbicides. Studies were conducted at seven locations on eight different soil types ranging from sandy loam to clay loam. Turf tolerance evaluations were made on bermudagrass for each imidazolinone herbicide. Additionally, tolerance to imizaquin was evaluated for centipedegrass, St. Augustinegrass 'Raleigh', bermduagrass 'Tifdwarf, Tifgreen, and Tifway' and zoysiagrass 'Meyer'. AC 214,925 was the most phytotoxic of the imidazolinone herbicides causing significant injury to bermudagrass at a rate of 0.31 kg/ha. AC 214,278 did not injure bermudagrass at rates of .14 kg/ha or higher. The minimum tolerance level observed where imazaquin was applied postemergently was .56 kg/ha (bermudagrass 'Tifway'), .84 kg/ha (bermudagrass 'Tifdwarf and Tifgreen'), centipedegrass and zoysiagrass ('Meyer'), and 1.12 kg/ha for St. Augustinegrass 'Raleigh'. Preemergence appplication of imazaquin did not injure bermudagrass (1.12 kg/ha) or bermudagrass 'Tifdwarf' (.84 kg/ha). Maximum tolerance levels of the various turfgrasses has not been determined. Imazaquin applied postemergently resulted in a noticeable growth retardation and purpling of Virginia buttonweed foliage. However, when tank mixed with MSMA the degree of Virginia buttonweed control, although somewhat inconsistent in these late season studies, was significantly increased. Similarly an increase in activity on Virginia buttonweed was obtained when imazaquin was added to phenoxy herbicide(s). The MSMA/ imazaquin activity appeared to be synergestic while phenoxy/imazaquin activity appeared to be additive. The addition of imazaquin to MSMA does not appear to influence the normal herbicidal activity of MSMA, DSMA, or CMA. Postemergence activity of imazaquin on purple nutsedge in turfgrasses maintained at .63 to 5.0 cm was excellent following August applications. Addition of bentazon (1.12 kg/ha) to imazaquin resulted in an apparent antagonism while addition of MSMA did not appear to influence the activity of imazaquin on purple nutsedge." |
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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):
Coats, G. E. 1985. Weed Control in Warm Season Turfgrasses with Imidazolinone Herbicides. Proc. Meet. South. Weed Sci. Soc. 38:p. 97. |
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MSU catalog number: SB 611 .S6 v.38 |
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