Effect of Imazapic Application Timing on Texas Peanut (<i>Arachis hypogaea</i>)¹

Abstract

Field experiments conducted in Texas at six locations from 1996 to 1998 evaluated peanut tolerance to imazapic applied postemergence. Imazapic at 71 g ai/ha was applied weekly from ground cracking to 56 d after ground cracking (DAGC). Visible injury 70 DAGC ranged from 0 to 40%. No reduction in canopy height, canopy width, yield, or grade was observed at harvest following any imazapic treatment.Nomenclature: Imazapic; peanut, Arachis hypogaea L., ‘AT 120’, ‘GK 7’, ‘NC 7’, ‘Tamspan 90’.Additional index words: Herbicide injury, ground cracking, groundnut, herbicide timings, peanut injury, postemergence, yield.Abbreviations: DAGC, days after ground cracking; DAP, days after planting; POST, postemergence; PPI, preplant incorporated.