pnut pnut Peanut Science 0095-3679 0095-3679 American Peanut Research and Education Society 10.3146/i0095-3679-24-1-3 Peanut (Arachis hypogaea L.) Response to Imazethapyr as Affected by Timing of Application1 W. James Grichar 2, *, P. R. Nester 3, and D. C. Sestak 2 The Texas Agric. Exp. Stn., Yoakum, TX 77995. American Cyanamid Co., The Woodlands, TX 77381.

1 This research was supported in part by grants from the Texas Peanut Producers Board.

 *Corresponding author. 1 1997 24 1 10 12 American Peanut Research and Education Society 1997 American Peanut Research and Education Society Abstract

Field studies were conducted in 1994 and 1995 to evaluate the effect of imazethapyr on peanut growth and yield under weed-free conditions as influenced by timing of application. Imazethapyr applied preemergence (PRE) and 7, 21, 35, 49, and 63 d after planting (DAP) had no effect on peanut pod weight. In 1 of 2 yr, imazethapyr applied PRE, 21 DAP, or 35 DAP increased yield over the untreated check. In 1 of 2 yr, peanut grade was reduced with imazethapyr applied 49 DAP.

 Key Words Groundnut; , herbicides; , peanut injury; , preemergence; , pod yield; , postemergence; , total sound mature kernels