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1 July 2009 Response of Three Annual Medic Species to Postemergence Herbicides
W. James Grichar, W. R. Ocumpaugh
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Field studies were conducted from 2004 to 2006 to evaluate the tolerance of three annual medic species (bur, black, and barrel medic) to selected POST herbicides. 2,4-DB at 0.56 and 1.12 kg/ha caused the most stunting across all three species. Imazethapyr at 0.1 kg/ha stunted all three annual medics in 1 of 3 yr whereas flumetsulam at 0.04 kg/ha stunted black and barrel medics in 1 of 3 yr. Clethodim at 0.28 kg/ha did not cause any medic stunting. Imazethapyr, imazamox, and 2,4-DB at 0.56 kg/ha reduced henbit dry matter composition compared to the untreated check whereas clethodim, flumetsulam, and 2,4-DB at 1.12 kg/ha did not. In 2004, 2,4-DB at 1.12 kg/ha reduced dry weight yield of bur and barrel medic but not black medic when compared with the untreated check. Black medic treated with imazethapyr at 0.05 and 0.1 kg/ha and clethodim at 0.28 kg/ha produced higher dry weight yield than the untreated check. In 2006, both rates of 2,4-DB and flumetsulam at 0.04 kg/ha reduced dry weight yield of bur medic compared to the untreated check. Barrel medic dry weight yields were reduced by both rates of 2,4-DB and flumetsulam compared to untreated check. No herbicides reduced dry weight yields of black medic.

Nomenclature: Clethodim; 2,4-DB; flumetsulam; imazamox; imazethapyr; henbit, Lamium amplexicaule L. LAMAM; bur medic, Medicago polymorpha L. ‘Armadillo’; black medic, Medicago lupulina L. ‘BeBlk’; barrel medic, Medicago truncatula L. ‘Jemalong’.

W. James Grichar and W. R. Ocumpaugh "Response of Three Annual Medic Species to Postemergence Herbicides," Weed Technology 23(3), 412-415, (1 July 2009).
Received: 18 February 2009; Accepted: 1 May 2009; Published: 1 July 2009
Crop injury
dry weight yield
herbicide tolerance
legume–grass pastures
pasture management
weed management
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