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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Rhodes, G. N. Jr.;
Fribourg, H. A. |
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| Author Affiliation: | University of Tennessee |
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| Title: | Destruction of Endophyte Infected Tall Fescue Sod with Herbicides. |
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| Source: | Southern Weed Science Society Proceedings. Vol. 40, January 1987, p. 108. |
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| Publishing Information: | Nashville, TN: Southern Weed Science Society. |
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| Keywords: | TIC Keywords: Festuca arundinacea; Endophytes; Paraquat; Herbicides
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| Abstract/Contents: | "Tall fescue (Festuca arundinacea Schreb.), a perennial cool-season grass, is one of the most widely grown forage species in the United States, occupying approximately 14 million ha. Although nutritional composition is superior to many other grasses, poor performance of cattle, sheep and horses has been associated with the presence of the endophytic fungus Acremonium coenophialum Morgan-Jones and Gams in pastures of tall fescue. Current estimates indicate that 80 to 90% of all tall fescue pastures are infected with the fungus. In heavily infested pastures, it is often desirable to destroy the infected sod and reestablish the pasture with fungus free seed. Chemical destruction is often preferable to mechanical destruction, particularly on land susceptible to erosion. Field research was conducted during 1985 and 1986 to determine the optimum rates and timings of paraquat and glyphosate applications when used in tall fescue destruction programs in the spring and fall, and to investigate the utility of sulfosate for potential use in destruction programs in the spring. Prior to application of herbicides , tall fescue was clipped to a stubble height of 5 cm, raked, and allowed to regrow to approximately 8 cm. Herbicides were applied with a CO2 backpack sprayer in a volume of 187 1/ha at 283 kPa. The experimental design was a randomized complete block with four replications. Experimental units were 2.4 m wide by 9.1 m long. Sequential applications of paraquat (0.3 followed by 0.3 kg ai/ha, 0.6 followed by 0.3 kg ai/ha, and 0.6 followed by 0.6 kg ai/ha) gave excellent control of tall fescue in early fall, late fall, and spring applications. Paraquat rate had little influence on level of control. Fall applications of glyphosate were more efficacious than spring applications. Increasing the rate of glyphosate from 1.1 to 2.2 kg ai/ha increased control. The performance of glyphosate was improved when paraquat was applied subsequently. In spring applications, sulfosate applied alone (0.6, 1.1, or 1.7 kg ai/ha), did not provide acceptable tall fescue control. As with glyphosate, performance of sulfosate was improved when paraquat was applied subsequently." |
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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):
Rhodes, G. N. Jr., and H. A. Fribourg. 1987. Destruction of Endophyte Infected Tall Fescue Sod with Herbicides.. South. Weed Sci. Soc. Proc. 40:p. 108. |
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MSU catalog number: SB 611 .S6 |
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