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Field studies were conducted from 2006 to 2008 in the peanut (Arachis hypogaea) growing regions of Georgia, North Carolina, and Texas to ascertain two formulations of imazapic marketed as formulation-1 (Cadre®) and formulation-2 (Impose®). Both formulations controlled Acanthospermum hispidum, Eclipta prostrate, Richardia scabra, Verbesina encelioides, Amaranthus palmeri, Ipomoea lacunosa, Sida spinosa, Cucumis melo, Urochloa texana, Cyperus rotundus, and Cyperus esculentus at least 70% in most instances. Ambrosia artemisiifolia and Trianthema portulacastrum control was poor (>70%). Neither formulation of imazapic alone injured peanut in south Texas; however, in Georgia peanut injury ranged from 3 to 8% and in North Carolina injury was 8–20% when rated up to 27 d after herbicide application. Imazapic, regardless of formulation, applied with bentazon injured peanut 5–20% in Georgia and North Carolina but not in Texas. Either formulation of imazapic plus paraquat injured peanut 15–30% in Georgia, 8–17% in Texas, and 28–48% in North Carolina. Imazapic, regardless of formulation, in combination with paraquat reduced yield compared with imazapic alone at one of four locations. |
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