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Seashore Paspalum (Paspalum vaginatum) Tolerance to Pronamide Applications for Annual Bluegrass Control

Published online by Cambridge University Press:  20 January 2017

Patrick E. McCullough ,
Jialin Yu  and
Diego Gomez de Barreda
Patrick E. McCullough
Affiliation:
Deparment of Crop and Soils, University of Georgia, 1109 Experiment Street, Griffin, GA 30223
Jialin Yu
Affiliation:
Deparment of Crop and Soils, University of Georgia, 1109 Experiment Street, Griffin, GA 30223
Diego Gomez de Barreda
Affiliation:
Universitat Politècnica de València, Valencia, Spain
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Abstract

Annual bluegrass is a troublesome weed in turf management and there are currently limited POST herbicides labeled for use in seashore paspalum. Field and greenhouse experiments were conducted to evaluate seashore paspalum tolerance to pronamide and other herbicides for annual bluegrass control. In field experiments, turf injury never exceeded 7% from pronamide applied at dormancy, 50% green-up, or complete green-up of seashore paspalum in spring. Annual bluegrass control from pronamide was initially similar across timings and averaged 67, 90, and 98% control from 0.84, 1.68, and 3.36 kg ai ha−1, respectively, after 6 wk. In greenhouse experiments, the aforementioned pronamide rates caused less than 10% injury on seashore paspalum. Seashore paspalum injury in the greenhouse was excessive (> 20%) from atrazine, bispyribac-sodium, and trifloxysulfuron and moderate (7 to 20%) from foramsulfuron, rimsulfuron, and ethofumesate. Seashore paspalum seedhead count reductions by 4 wk after treatment (WAT) were good to excellent (87 to 98%) from atrazine, bispyribac-sodium, rimsulfuron, and trifloxysulfuron and poor (≤ 0%) from ethofumesate, foramsulfuron, and pronamide. By 4 WAT, seashore paspalum clippings were reduced 0 to 39% from pronamide, whereas atrazine, bispyribac-sodium, and trifloxysulfuron reduced clippings by 54 to 69% from the untreated and ethofumesate, foramsulfuron, and rimsulfuron reduced clippings by 27 to 39%.

Poa annua es una maleza problemática en el manejo de césped y actualmente no existe un herbicida posemergente eficaz recomendado para su uso en Paspalum vaginatum. Se condujeron experimentos de campo y de invernadero para evaluar la tolerancia de P. vaginatum a pronamide y otros herbicidas en el control de P. annua. En los experimentos de campo, el daño al césped nunca fue más de 7% con pronamide aplicado en dormancia, en 50% de reverdecimiento o en reverdecimiento total de P. vaginatum en la primavera. El control de P. annua con pronamide fue inicialmente similar en los tres momentos de aplicación y promedió 67, 90 y 98% de control a partir de 0.84, 1.68 y 3.36 kg i.a. ha−1, respectivamente, después de 6 semanas. En los experimentos de invernadero, las dosis anteriormente mencionadas de pronamide causaron menos de 10% de daño en P. vaginatum. El daño de P. vaginatum en el invernadero fue excesivo (>20%) cuando se aplicaron atrazina, bispyribac-sodium, y trifloxysulfuron, y fue moderado (de 10 a 20%) cuando se aplicó foramsulfuron, rimsulfuron y ethofumesate. Las reducciones en el número de cabezuelas de P. vaginatum a las 4 semanas después de la aplicación, fueron de buenas a excelentes (de 87 a 98%) con atrazina, bispyribac-sodium, rimsulfuron y trifloxysulfuron fueron pobres (<70%) con ethofumesate, foramsulfuron y pronamide. A las 4 semanas después de la aplicación, los recortes de P. vaginatum se redujeron de 0 a 39% con pronamide, mientras que atrazina, bispyribac-sodium y trifloxysulfuron redujeron los recortes de 54 a 69% en comparación con el testigo no tratado, y ethofumesate, foramsulfuron y rimsulfuron redujeron los recortes en 27 a 39%.

Keywords

Annual bluegrass, Poa annua L.seashore paspalum, Paspalum vaginatum SwPronamideturfgrassweed control
Type
Weed Management—Other Crops/AREAS
Information
Weed Technology , Volume 26 , Issue 2 , June 2012 , pp. 289 - 293
Copyright
Copyright © Weed Science Society of America 

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