Weed Management in Evenly-Spaced 38- vs. 76-cm Row Peanut (Arachis hypogaea)

Abstract

Abstract Research was conducted in Florida in 2005 through 2008 to evaluate weed management systems in narrow (38-cm)- and wide (76-cm)-row peanut. Benghal dayflower control increased when peanut row spacing was narrowed. Paraquat plus bentazon early-postemergence (EPOST) followed by (fb) imazapic or imazethapyr mid-postemergence (MPOST) or chlorimuron late-postmergence (LPOST) controlled Benghal dayflower at least 90%. Imazapic EPOST with or without 2,4-DB MPOST controlled Benghal dayflower 98 to 100%. Diclosulam or flumioxazin preemergence (PRE) fb paraquat plus bentazon EPOST fb 2,4-DB MPOST or either PRE herbicide fb 2,4-DB MPOST did not increase Benghal dayflower control compared with imazapic-containing treatments. Browntop millet control was 98 to 100% for treatments with imazapic or imazethapyr EPOST and control was greater in narrow-row compared to wide-row peanut. All herbicide treatments controlled pitted morningglory at least 90% and peanut row spacing did not influence control. Only treatments with imazapic EPOST as a component controlled sicklepod at least 90%. No difference between peanut row spacing was observed for sicklepod control. Peanut planted in narrow-rows yielded greater than wide-row peanut. Few differences in peanut yield were observed among herbicide treatments, but all herbicide treatments resulted in yields greater than the nontreated control. Data indicates that seeding peanut in narrow-rows will improve Benghal dayflower and browntop millet control and will increase peanut yield compared to wide-row peanut.