Abstract: Field studies were conducted to evaluate the tolerance of peanut cultivars ‘Florunner’, ‘Georgia Green’, ‘Sunoleic 95R’, ‘AgriTech GK7’, ‘NC-7’, ‘ViruGard’, and ‘Spanco’ to sulfentraone. Herbicide treatments included sulfentrazone applied as a single treatment preemergence (PRE) at 0.14, 0.21, 0.28, 0.35, or 0.42 kg ai/ha or as a PRE followed by (fb) an at cracking (AC) application (0.14 kg ai/ha PRE fb 0.14 kg ai/ha AC, 0.21 kg ai/ha PRE fb 0.14 kg ai/ha AC, 0.21 kg ai/ha PRE fb 0.21 kg ai/ha AC, 0.28 kg ai/ha PRE fb 0.07 kg ai/ha AC, or 0.28 kg ai/ha PRE fb 0.14 kg ai/ha AC). Imazapic and paraquat applied early postemergence (EPOT) were included along with a weed-free control. NC-7 exhibited higher early-season injury (ranging from 1 to 29%) than other cultivars across all sulfentrazone applications. However, this injury did not affect yield when compared with the untreated weed-free check. Overall, peanut tolerance to sulfentrazone was high across all varieties.

Nomenclature: Imazapic, (±)-2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-methyl-3-pyridinecarboxylic acid); paraquat-dichloride, 1,1′-dimethyl-4,4′-bipyridinium dichloride; sulfentrazone, N-[2,4-dichloro-5-[4-(difluoromethyl)]-4,5-dihydro-3-methyl-5-oxo-1H-1,2,4-triazol-1-yl]phenyl]methanesulfonamide; peanut, Arachis hypogaea L., ‘AgriTech GK7’, ‘Florunner’, ‘Georgia Green’, ‘NC-7’, ‘Sunoleic 95R’, ‘Spanco’, ‘ViruGard’.

Additional index words: Peanut injury, peanut cultivar, peanut yield, herbicide susceptibility.

Abbreviations: AC, at cracking; ALS, acetolactate synthase; EPOT, early postemergence; fb, followed by; POST, postemergence; PPI, preplant incorporated; PRE, preemergence.