A persistent problem was identified in pecan ( Carya illinoinensis ) orchards throughout southern Georgia in which pecan trees growing in rows immediately adjacent to peanut ( Arachis hypogaea ) fields developed hollow pecans. In-shell nut size and appearance was normal; however, the kernels failed to develop. In 2008 and 2009, research was conducted to evaluate the influence of imazapic on pecan nut development in two pecan orchards located at the University of Georgia Ponder Research Farm located near Tifton, GA. Three herbicide treatments were evaluated, including imazapic at 0.17 kg·ha −1 , imazapic at 0.30 kg·ha −1 , and a nontreated control. Imazapic inhibited pecan kernel production and shuck split during both years of study. In 2009, leaf potassium was reduced by the low rate of imazapic.