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Evaluation of Herbicide Options for Alligatorweed (Alternanthera philoxeroides) Control in Rice

Published online by Cambridge University Press:  20 January 2017

Samuel D. Willingham
Affiliation:
Department of Soil and Crop Sciences, Texas A&M University, College Station, TX 77843
Muthukumar V. Bagavathiannan*
Affiliation:
Department of Soil and Crop Sciences, Texas A&M University, College Station, TX 77843
Katherine S. Carson
Affiliation:
Department of Soil and Crop Sciences, Texas A&M University, College Station, TX 77843
Todd J. Cogdill
Affiliation:
Department of Soil and Crop Sciences, Texas A&M University, College Station, TX 77843
Garry N. McCauley
Affiliation:
Texas A&M Agricultural Experiment Station, Eagle Lake, TX 77434
James M. Chandler
Affiliation:
Department of Soil and Crop Sciences, Texas A&M University, College Station, TX 77843
*
Corresponding author's e-mail: [email protected].

Abstract

Alligatorweed is a perennial, invasive weed in southern United States rice production, but knowledge on effective management of this weed is limited, especially in conventional (non-imidazolinone-resistant) rice fields. Field studies were conducted in multiple environments in southeastern Texas to evaluate different herbicide options involving penoxsulam, propanil, triclopyr, halosulfuron, bispyribac-sodium, bensulfuron, and quinclorac for alligatorweed control in conventional drill-seeded rice when applied at early POST (EPOST), late POST (LPOST), or both. Among the herbicide options evaluated, penoxsulam alone (up to 83%), penoxsulam plus triclopyr (up to 87%), or bispyribac-sodium plus triclopyr (92%) provided superior alligatorweed control. Plots treated with penoxsulam plus triclopyr EPOST produced the highest yields (9,550 kg ha−1), which were comparable to plots receiving penoxsulam plus triclopyr LPOST (9,320 kg ha−1), penoxsulam alone EPOST (9,280 kg ha−1), and penoxsulam plus halosulfuron LPOST (9,180 kg ha−1). Considering both weed control and rice grain yields, penoxsulam plus triclopyr applied EPOST was found to be the best option among the treatments tested. The treatments bensulfuron alone, bensulfuron plus propanil, penoxsulam plus propanil, triclopyr plus propanil, and bispyribac-sodium plus propanil provided poor (≤ 65%) alligatorweed control. Results also suggest the likelihood for antagonistic interactions when tank-mix combinations tested in this study included propanil.

Alternanthera philoxeroides es una maleza perenne invasiva en la producción de arroz en el sur de los Estados Unidos, pero el conocimiento sobre formas efectivas para su manejo es limitado, especialmente en campos convencionales (sin resistencia a herbicidas imidazolinone). Se realizaron estudios de campo en múltiples ambientes en el sureste de Texas, para evaluar diferentes opciones de herbicidas que consistieron de penoxsulam, propanil, triclopyr, halosulfuron, bispyribac-sodium, bensulfuron, y quinclorac para el control de A. philoxeroides en arroz convencional de siembra directa cuando fueron aplicados en POST temprana (EPOST), POST tardía (LPOST), o en ambos. Entre las opciones de herbicidas evaluadas, penoxsulam solo (hasta 83%), penoxsulam más triclopyr (hasta 87%), o bispyribac-sodium más triclopyr (92%) brindaron un control superior de A. philoxeroides. Las parcelas tratadas con penoxsulam más triclopyr en EPOST produjeron los rendimientos más altos (9,550 kg ha−1), los cuales fueron comparables a parcelas que recibieron penoxsulam más triclopyr en LPOST (9,320 kg ha−1), penoxsulam solo en EPOST (9,280 kg ha−1), y penoxsulam más halosulfuron en LPOST (9,180 kg ha−1). Al considerar el control de la maleza y el rendimiento en grano del arroz, la aplicación EPOST de penoxsulam más triclopyr fue una opción de manejo adecuada. Los tratamientos bensulfuron solo, bensulfuron más propanil, penoxsulam más propanil, triclopyr más propanil, y bispyribac-sodium más propanil brindaron un control de A. philoxeroides pobre. Los resultados sugieren la posibilidad de interacciones antagónicas en mezclas en tanque que incluyen propanil.

Type
Research Article
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Associate Editor for this paper: Jason Bond, Mississippi State University.

References

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