Spring Glyphosate Application for Selective Control of Downy Brome (Bromus tectorum L.) on Great Basin Rangelands

Downy brome has converted millions of hectares of Great Basin rangelands from shrubland to annual grass-dominated systems. Methods for removing downy brome from sites that already have perennial grasses established are especially needed because of the difficulty in re-establishing perennial species....

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Veröffentlicht in:Weed technology 2016-03, Vol.30 (1), p.297-302
Hauptverfasser: Morris, Christo, Morris, Lesley R, Surface, Cheryl
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description Downy brome has converted millions of hectares of Great Basin rangelands from shrubland to annual grass-dominated systems. Methods for removing downy brome from sites that already have perennial grasses established are especially needed because of the difficulty in re-establishing perennial species. In this study, early spring applications of glyphosate alone and glyphosate plus imazapic were monitored for 2 yr. Cover of downy brome was reduced from 45 to 10% by spring application of glyphosate alone and to approximately 1% with the addition of imazapic. Perennial grass cover was not affected by the spring application of glyphosate. The addition of imazapic reduced perennial grass cover in the first year; however, it recovered by the second year. The selective response to glyphosate may be due to differences in growth stage or dormancy characteristics between annual and perennial species. Our findings suggest spring application of glyphosate may provide an alternative approach for managing annual grasses on Great Basin rangelands. Nomenclature: Glyphosate; imazapic; downy brome, Bromus tectorum L. BROTE. Bromus tectorum ha convertido millones de hectáreas del territorio de Great Basin de sistemas arbustivos a sistemas dominados por gramíneas anuales. Métodos que remuevan B. tectorum de sitios que ya tienen gramíneas perennes establecidas son especialmente requeridos debido a la dificultad de re-establecer especies perennes. En este estudio, aplicaciones de glyphosate solo y glyphosate más imazapic, temprano en la primavera, fueron monitoreadas durante 2 años. La cobertura de B. tectorum se redujo de 45 a 10% con la aplicación de glyphosate solo y a aproximadamente 1% con la adición de imazapic. La cobertura de gramíneas perennes no fue afectada por la aplicación de glyphosate en la primavera. La adición de imazapic redujo la cobertura de gramíneas perennes en el primer año, pero se recuperó en el segundo año. La respuesta selectiva a glyphosate podría deberse a diferencias en el estadio de desarrollo o las características de latencia entre especies anuales y perennes. Nuestros resultados sugieren que la aplicación de glyphosate en la primavera podría brindar una alternativa para el manejo de gramíneas anuales en los territorios de Great Basin.
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Methods for removing downy brome from sites that already have perennial grasses established are especially needed because of the difficulty in re-establishing perennial species. In this study, early spring applications of glyphosate alone and glyphosate plus imazapic were monitored for 2 yr. Cover of downy brome was reduced from 45 to 10% by spring application of glyphosate alone and to approximately 1% with the addition of imazapic. Perennial grass cover was not affected by the spring application of glyphosate. The addition of imazapic reduced perennial grass cover in the first year; however, it recovered by the second year. The selective response to glyphosate may be due to differences in growth stage or dormancy characteristics between annual and perennial species. Our findings suggest spring application of glyphosate may provide an alternative approach for managing annual grasses on Great Basin rangelands. Nomenclature: Glyphosate; imazapic; downy brome, Bromus tectorum L. BROTE. Bromus tectorum ha convertido millones de hectáreas del territorio de Great Basin de sistemas arbustivos a sistemas dominados por gramíneas anuales. Métodos que remuevan B. tectorum de sitios que ya tienen gramíneas perennes establecidas son especialmente requeridos debido a la dificultad de re-establecer especies perennes. En este estudio, aplicaciones de glyphosate solo y glyphosate más imazapic, temprano en la primavera, fueron monitoreadas durante 2 años. La cobertura de B. tectorum se redujo de 45 a 10% con la aplicación de glyphosate solo y a aproximadamente 1% con la adición de imazapic. La cobertura de gramíneas perennes no fue afectada por la aplicación de glyphosate en la primavera. La adición de imazapic redujo la cobertura de gramíneas perennes en el primer año, pero se recuperó en el segundo año. La respuesta selectiva a glyphosate podría deberse a diferencias en el estadio de desarrollo o las características de latencia entre especies anuales y perennes. Nuestros resultados sugieren que la aplicación de glyphosate en la primavera podría brindar una alternativa para el manejo de gramíneas anuales en los territorios de Great Basin.</abstract><cop>Lawrence</cop><pub>The Weed Science Society of America</pub><doi>10.1614/WT-D-15-00119.1</doi><tpages>6</tpages></addata></record>
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subjects American Recovery & Reinvestment Act 2009-US
Annual plants
Cheatgrass
Conservation
dormancy
fire
Forbs
Germination
Grasses
Herbicides
Perennial growth
Perennials
Precipitation
Rangelands
restoration
Seasons
Shrubs
Vegetation
title Spring Glyphosate Application for Selective Control of Downy Brome (Bromus tectorum L.) on Great Basin Rangelands
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