Abstract: Two field experiments were conducted to evaluate the effects of selected herbicides on Italian ryegrass, combined Italian ryegrass plus wheat forage production, and returns from hard red winter wheat grain. Herbicides included BAY FOE 5043 metribuzin (4:1 w/w premix), BAY MKH 6562, chlorsulfuron, chlorsulfuron metsulfuron (5:1 w/w premix), diclofop, MON 37560, pendimethalin, ICIA 0604, and triasulfuron. Italian ryegrass was controlled 80% or more by 28 of 34 treatments. Grain dockage was reduced by 33 of 34 treatments at both sites, and grain yield was improved at both sites by 29 of 34 treatments. No herbicide treatment decreased forage protein content, but forage yield was frequently decreased by controlling Italian ryegrass. Gross returns from wheat grain were improved over the untreated check by all but six treatments at site 1, and by all but one treatment at site 2. The data did not support the hypothesis that returns from forage plus grain could be maximized by delaying Italian ryegrass control until grazing termination.
Nomenclature: BAY FOE 5043, N-(4-fluorophenyl)-N-(1-methylethyl)-2-[[5-(trifluoromethyl)-1,3,4-thiadiazol-2-yl]oxy]acetamide; BAY MKH 6562, 1H-1,2,4-triazole-carboxamide,4,5-dihydro-3-methoxy-4-methyl-5-oxo-N-[[2-(trifluoromethoxy)phenyl]sulfonyl]-sodium salt; chlorsulfuron; diclofop; metribuzin; metsulfuron; MON 37560, 1-(4,6-dimethoxypyrimidin-2-yl)-3-[(ethanesulfonyl-imidazo[1,2-a]-pyridine-3-yl)sulfonyl]urea; pendimethalin; ICIA 0604 (proposed common name, tralkoxydim), 2-cyclohexen-1-one,2-[1-(ethoxyimino)propyl]-3-hydroxy-5-(2,4,6-trimethylphenyl)-(9Cl); triasulfuron; Italian ryegrass, Lolium multiflorum Lam., Marshall #3 LOLMU; wheat, Triticum aestivum L., 2137.
Additional index words: BAY FOE 5043, BAY MKH 6562, chlorsulfuron, diclofop, metribuzin, metsulfuron, MON 37560, pendimethalin, ICIA 0604, triasulfuron, forage.
Abbreviations: DAS, days after seeding; POST, postemergence; PRE, preemergence.
