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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Bingham, S. W.;
Chism, W. J. |
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| Author Affiliation: | Virginia Polytechnic Institute and State University, Blacksburg, VA |
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| Title: | Selective control of johnsongrass [(Sorghum halapense (L.) Pers.] in highway tall fescue |
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| Meeting Info.: | Little Rock, AR; January 21-22, 1992 |
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| Source: | Southern Weed Science Society Proceedings. Vol. 45, January 1992, p. 283. |
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| Publishing Information: | Champaign, IL: Southern Weed Science Society. |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Roadside turf; Weed control; Sorghum halepense; Festuca arundinacea; Fenoxaprop-ethyl; Imazethapyr
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| Abstract/Contents: | "Johnsongrass has become a widespread problem weed along roadsides of Virginia and several other states. During the last 4 years, we have evaluated herbicides for selective control of this perennial grass in roadside tall fescue. Initially, two application techniques were evaluated: 1) spot treatments with a hand gun for spray-to-wet the foliage and 2) broadcast treatments with a boom delivering 30 gpa. During 1988, the normal practice with the Virginia Dept. of Trans. was to use glyphosate at 6 lbs a.i./100 gallons of water to spray-to-wet johnsongrass foliage. This resulted in bare exposed soil until johnsongrass reinvaded the area next year. Herbicides were selected for study that have shown some degree of selectivity for johnsongrass control in tall fescue, i.e. fenoxaprop, sethoxydim CGA 136872. The rates of herbicides showing good promise included: fenoxaprop at 0.4, sethoxydim at 0.75, and CGA 136872 at 0.06 lb a.i./100 gallons of water for spot spraying of johnsongrass. The standard glyphosate treatment gave 100% control of both johnsongrass and tall fescue. Similar results were obtained in 1989. The broadcast applications during 1988 included several rates of each herbicide above. Fenoxaprop at 0.3 lb/A provided 83% control of johnsongrass without tall fescue injury. CGA 136872 at 0.58 lb/A gave 82% control; however, severe injury was prevalent after 3 months. During 1990 our research concentrated on broadcast applications and determined that nicosulfuron, fenoxaprop, and HOE 46360 05H (an isomer of fenoxaprop) were quite effective and similar in control of 18 inch tall johnsongrass. Nicosulfuron at 0.054 lb/A was injurious and reduced tall fescue quality more than fenoxaprop or HOE 46360. As the johnsongrass shoots were controlled to 90% with fenoxaprop or HOE 46360, tall fescue turf quality improved to a very acceptable level as compared to non-mowed and untreated plots or with injury from nicosulfuron. CGA 136872 caused tall fescue injury and failed to provide adequate johnsongrass control at this site. In 1991, nicosulfuron, CGA 136872, fenoxaprop, and HOE 46360 provided low injury, acceptable quality, and johnsongrass control. Tank mixtures of the active isomer of fluazifop plus HOE 46360 and imazethapyr plus imazapyr were quite promising for johnsongrass control with low injury to tall fescue. In a second experiment, sequential applications of imazethapyr, fenoxaprop, HOE 46360 alone and in tank mixtures with fluazifop isomer were tested. Low rates of sequential applications of fenoxaprop, HOE 46360 plus fluazifop and imazethapyr provided improved johnsongrass control over single treatments. Tall fescue injury was low and turf quality was similar in both single and sequential treatments. The tank mixtures of mefluidide with nicosulfuron, CGA 136872, fenoxaprop, HOE 46360 or imazethapyr did not improve johnsongrass control over each used alone." |
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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):
Bingham, S. W., and W. J. Chism. 1992. Selective control of johnsongrass [(Sorghum halapense (L.) Pers.] in highway tall fescue. South. Weed Sci. Soc. Proc. 45:p. 283. |
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MSU catalog number: SB 611 .S6 |
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