Weed Management in Peanut with Herbicide Combinations Containing Imazapic and Other Pesticides

• Published in: Weed technology 2009-01, Vol.23 (1), p.6-10
• Main Authors: Jordan, David L, Lancaster, Sarah H, Lanier, James E, Lassiter, Bridget R, Johnson, P. Dewayne
• Format: Article
• Language: English
• Subjects: 2,4-DB; acifluorfen; application rate; application timing; Arachis hypogaea; broadleaf weeds; Coastal plains; Corporations; Crop protection; crop yield; diclosulam; Fungicides; grass weeds; Herbicides; imazapic; Peanuts; Pesticide compatibility; Pesticides; postemergent weed control; preemergent weed control; species differences; Surfactants; Technology; Weed control; weed management; WEED MANAGEMENT—MAJOR CROPS
• ISSN: 0890-037X; 1550-2740
• DOI: 10.1614/WT-08-041.1

Research was conducted in North Carolina to compare weed control by various rates of imazapic POST alone or following diclosulam PRE. In a second experiment, weed control by imazapic applied POST alone or with acifluoren, diclosulam, or 2,4-DB was compared. In a final experiment, yellow nutsedge control by imazapic alone and with the fungicides azoxystrobin, chlorothalonil, pyraclostrobin, and tebuconazole was compared. Large crabgrass was controlled more effectively by imazapic POST than diclosulam PRE. Common lambsquarters, common ragweed, and eclipta were controlled more effectively by diclosulam PRE than imazapic POST. Nodding spurge was controlled similarly by both herbicides. Few differences in control were noted when comparing imazapic rates after diclosulam PRE. Applying either diclosulam PRE or imazapic POST alone or in combination increased peanut yield over nontreated peanut in five of six experiments. Few differences in pod yield were noted when comparing imazapic rates. Acifluorfen, diclosulam, and 2,4-DB did not affect entireleaf morningglory, large crabgrass, nodding spurge, pitted morningglory, and yellow nutsedge control by imazapic. Eclipta control by coapplication of imazapic and diclosulam exceeded control by imazapic alone. The fungicides azoxystrobin, chlorothalonil, pyraclostrobin, and tebuconazole did not affect yellow nutsedge control by imazapic. Nomenclature: Acifluorfen; azoxystrobin, methyl (E)-2-{2-[6-(2-cyanophenoxy)pyrimidin-4-yloxy]phenyl}-3-methoxyacrylate; bentazon; chlorothalonil, tetrachloroisophthalonitrile; 2,4-DB; diclosulam; imazapic; pyraclostrobin, methyl [2-[[[1-(4-chlorophenyl)-1H-pyrazol-3-yl]oxy]methyl]phenyl]methoxycarbamate; tebuconazole, α-[2-(4-chlorophenyl)ethyl]-α-(1,1-dimethylethyl)-1H-1,2,4-triazole-1-ethanol; common lambsquarters, Chenopodium album L. CHEAL; common ragweed, Ambrosia artemisiifolia L. AMBEL; eclipta, Eclipta prostrata L. ECLAL; entireleaf morningglory, Ipomoea hederacea var. integruscula Gray IPOHG; large crabgrass, Digitaria sanguinalis (L.) Scop. DIGSA; nodding spurge, Chamaesyce nutans (Lag.) Small EPHNU; pitted morningglory, Ipomoea lacunosa L. IPOLA; yellow nutsedge, Cyperus esculentus L. CYPES; peanut, Arachis hypogaea L