Cotton Response to Imazapic and Imazethapyr Residue Following Peanut

Abstract

Field studies were conducted at Denver City, Munday, and Yoakum (Gaines, Knox, and Lavaca Counties, respectively) to simulate residual concentrations of imazapic and imazethapyr in the soil and subsequent effects on cotton (Gossypium hirsutum L.).  Simulated imazapic or imazethapyr rates included 1/64X, 1/32X, 1/16X, 1/8X, 1/4X, and 1/2X of the full labeled rate for peanut (Arachis hypogaea L.) and incorporated prior to cotton planting.  Cotton stunting with imazapic or imazethapyr was more severe at Denver City than other locations.  All rates of imazapic and imazethapyr resulted in cotton stunting at Denver City while at Munday and Yoakum the 1/8X, 1/4X, and 1/2X rates of imazapic resulted in reduced cotton growth when compared with the untreated check.  At all locations imazapic caused more cotton stunt than imazethapyr.  Cotton lint yield was reduced by imazapic or imazethapyr at 1/4 X and 1/2 X rates when compared with the untreated check at all locations.