Evaluation of Herbicide Options for Alligatorweed (Alternanthera philoxeroides) Control in Rice Academic Article uri icon

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 ha1), which were comparable to plots receiving penoxsulam plus triclopyr LPOST (9,320 kg ha1), penoxsulam alone EPOST (9,280 kg ha1), and penoxsulam plus halosulfuron LPOST (9,180 kg ha1). 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.

published proceedings

  • WEED TECHNOLOGY

author list (cited authors)

  • Willingham, S. D., Bagavathiannan, M. V., Carson, K. S., Cogdill, T. J., McCauley, G. N., & Chandler, J. M.

citation count

  • 4

complete list of authors

  • Willingham, Samuel D||Bagavathiannan, Muthukumar V||Carson, Katherine S||Cogdill, Todd J||McCauley, Garry N||Chandler, James M

publication date

  • December 2015