Preplant control of mannagrass was greater than 90% with clethodim, glyphosate, sethoxydim, and sulfosate. Glyphosate at 0.5 to 1.0 kg ai/ha controlled mannagrass greater than 97%, and was not increased with any adjuvant. Fenoxaprop applied POST controlled mannagrass 97% but injured rice 33%. Except for fenoxaprop-ethyl, all POST treatments increased rice yields at least 1560 kg/ha more than the non-treated check. Southern watergrass was controlled 79 and 89% with 1.0 kg ai/ha glyphosate and 4.5 kg ai/ha sulfosate, respectively, while control was less than 55% with other herbicides. Nomenclature: Clethodim, (E,E)-(±)-2-[1-[[(3-chloro-2-propenyl)oxy]iminolpropyl]-5-[2-(ethylthio)- propyl]-3-hydroxy-2-cyclohexen-1-one; fenoxaprop-ethyl, (±)-ethyl 2-[4-[(6-chloro-2-benzoxazolyl)-oxy]phenoxy]propanoate; glyphosate, N-(phosphonomethyl)glycine; sethoxydim, 2-[1-(ethoxyimino)butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-one; sulfosate, (N-phosphonomethyl)glycine trimethyl sulfonium salt; mannagrass, Glyceria declinata Brebiss.; Southern watergrass, Luziola fluitans (Michx.) Terrell & H. Robinson; rice, Oryza sativa L.
All Science Journal Classification (ASJC) codes
- Agronomy and Crop Science
- Plant Science