Peanut ( Arachis hypogaea L.) Response to Carfentrazone-ethyl and Pyraflufen-ethyl Applied Close to Harvest

• Published in: Peanut science Vol. 44; no. 1; pp. 47 - 52
• Main Authors: Chaudhari, Sushila, Jordan, David, Jennings, Katherine
• Format: Journal Article
• Language: English
• Published: Lawrence American Peanut Research and Education Society 01.01.2017
• Subjects: Cultivars; Harvesting; Herbicides; Legumes; Peanuts; Vines
• ISSN: 0095-3679; 1943-7668
• DOI: 10.3146/PS16-20.1

ABSTRACT Morningglory (Ipomoea spp.) and other weeds are often present at peanut harvest and can interfere with digging pods and inverting vines. Carfentrazone-ethyl and pyraflufen-ethyl control large morningglory and could be an effective strategy as harvest aids in peanut. However, crop response to these herbicides has not been determined for Virginia market type peanut cultivars in North Carolina. One experiment was conducted during 2012, 2013, and 2014 to determine peanut response to carfentrazone or pyraflufen-ethyl applied postemergence 1 and 2 weeks prior to digging peanut pods and inverting vines. In a second experiment conducted during 2014 and 2015, peanut response to carfentrazone-ethyl, diclosulam, pyraflufen-ethyl, lactofen, and 2,4-DB applied 4 wk before digging (WBD) was determined. Visible peanut injury from carfentrazone-ethyl and pyraflufen-ethyl did not exceed 40% regardless of application timing or rate, and peanut yield was not affected compared with non-treated peanut regardless of visible injury when applied 1 or 2 WBD. However, when applied 4 WBD, peanut yields were 9 to 10% lower when carfentrazone-ethyl or pyraflufen-ethyl were applied compared with non-treated peanut. Diclosulam, lactofen, and 2,4-DB did not adversely affect yield. These results show that carfentrazone-ethyl and pyraflufen-ethyl will not affect peanut yield within 2 WBD but can reduce yield when applied earlier in the season during pod fill.