Herbicide Treatments for Control of Weeds in Dry-Seeded Rice (Oryza sativa)

Herbicide treatments of tank mixtures or sequential applications were applied at different growth stages and compared with standard treatments for control of barnyardgrass [ Echinochloa crus-galli (L.) Beauv. ♯ ECHCM], bearded sprangletop [ Leptochloa fascicularis (Lam.) Gray ♯ LEFFA], and aquatic weeds in rice ( Oryza sativa L. ‘Starbonnet’). Some herbicides injured rice more than the propanil (3’,4’-dichloropropionanilide) or molinate ( S -ethyl hexahydro-1 H -azepine-1-carbothioate) standards, but injury for all treatments was inconsequential. Postemergence tank mixture treatments that controlled barnyardgrass (two- to four-leaf stages), bearded sprangletop (two-leaf to tillering stages), and aquatic weeds better than standard treatments were propanil plus butachlor [ N -(butoxymethyl)-2-chloro-2’,6,-diethylacetanilide], oxadiazon [2- tert -butyl-4(2,4-dichloro-5-isopropoxyphenyl)-δ 2 -1,3,4-oxadiazolin-5-one] thiobencarb { S -[(4-chlorophenyl)methyl]diethylcarbamothioate}, or pendimethalin [ N -(1-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenamine].