Experiments were conducted in 2000 and 2001 to evaluate efficacy of AE F130060 03 plus AE F107892 applied postemergence for the control of Italian ryegrass in barley. AE F130060 03 plus AE F107892 controlled Italian ryegrass when applied at two application rates and at three timings. Barley successfully recovered from initial injury caused by early-postemergence (EP) and middle-postemergence (MP) application timings. The late-postemergence (LP) timing resulted in lower yield than the EP or MP application timings. AE F130060 03 plus AE F107892 applied EP controlled Italian ryegrass similar to flufenacet plus metribuzin applied delayed preemergence (DPRE) when rainfall was received. Barley yields were also similar. However, with insufficient rainfall, AE F130060 03 plus AE F107892 provided superior Italian ryegrass control. EP treatments of AE F130060 03 plus AE F107892 after a DPRE application of flufenacet plus metribuzin or chlorsulfuron plus metsulfuron completely controlled Italian ryegrass and resulted in excellent yields.
Nomenclature: AE F107892, diethyl 1-(2,4-dichlorophenyl)-5-methyl-2-pyrazoline-3, 5-dicarboxylate; AE F115008 00, [methyl 4-iodo-2-[3-(4-methoxy-6-methyl-1,3,5-triazin-2-yl)-ureidosulfonyl]benzoate, sodium salt]; AE F130060 00, methyl-2-[3-(4,6-dimethoxypyrimidin-2-yl)ureidosulfonyl]-4-methane-sulfonamidomethylbenzoate; chlorsulfuron; flufenacet; metribuzin; metsulfuron; Italian ryegrass, Lolium multiflorum (Lam.) #3 LOLMU; barley, Hordeum vulgare (L.) # HORVX ‘Nomini’; wheat, Triticum aestivum (L.) # TRZAW.
Additional index words: Crop tolerance, diclofop resistance.
Abbreviations: DAT, days after treatment; DPRE, delayed preemergence; EP, early postemergence; LP, late postemergence; MP, middle postemergence; POST, postemergence; PRE, preemergence.
