Abstract

Weed control and sugarbeet (Beta vulgarisL.) injury from applications of methylm-hydroxycarbanilatem-methyl-carbanilate (phenmedipham) were influenced by additives, volume of additive, and species in both field and greenhouse experiments. Oils were more effective than the surfactant as additives to phenmedipham on green foxtail (Setaria virdis(L.) Beauv.), yellow foxtail (Setaria glauca(L.) Beauv.), redroot pigweed (Amaranthus retroflexusL.), or common lambsquarters (Chenopodium albumL.). Herbicidal activity of phenmedipham on kochia (Kochia scoparia(L.) Schrad.) or wild mustard (Brassica kaber(D.C.) L.C. Wheeler var.pinnatifida(Stokes) L.C. Wheeler) was not enhanced by any additive. Linseed oil (2.34 L/ha) enhanced the herbicidal activity of phenmedipham on green foxtail, yellow foxtail, and redroot pigweed more than petroleum (2.34 L/ha) or sunflower (Helianthus annusL.) oil (2.34 or 9.35 L/ha). However, linseed oil reduced the herbicidal activity of phenmedipham on kochia.

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