pnut pnut Peanut Science 0095-3679 0095-3679 American Peanut Research and Education Society 10.3146/i0095-3679-21-1-15 Articles Use of F6285 for Weed Control in Peanut: Efficacy and Crop Injury1,2 W. Carroll Johnson III * and Benjamin G. Mullinix Jr. 3 Research Agron., USDA-ARS and Agric. Res. Stat., Univ. of Georgia, Coastal Plain Exp. Stn., Tifton, GA 31793-0748

1Cooperative investigations of the USDA Agric. Res. Ser. and the Univ. of Georgia Agric. Exp. Stn., Tifton. All programs and services of the U.S. Department of Agriculture are offered on a nondiscriminatory basis without regard to race, color, national origin, religion, sex, age, marital status, or handicap.

2Mention of a trademark, proprietary product, or vendor does not constitute a guarantee or warranty of the product by the USDA or the University of Georgia and does not imply it approval to the exclusion of other products or vendors that may also be suitable.

 *Corresponding author. 1 1994 21 1 65 68 21 4 1994 American Peanut Research and Education Society 1994 American Peanut Research and Education Society Abstract

Field studies in 1991 and 1992 at Tifton and Attapulgus, GA evaluated the weed control efficacy and crop safety of F6285 on peanut. Treated peanut were stunted by F6285 and had chlorotic leaflet margins. The degree and persistence of injury varied according to rate of F6285. The lowest rate of F6285 (0.14 kg ai ha-1) produced the aforementioned symptoms early in the season, but peanut recovered by late season with no yield effects (P≤0.05). F6285 at 0.28 and 0.42 kg ha-1 severely injured peanut and reduced yields. Preemergence and vegetative emergence applications of F6285 were equally injurious. F6285 effectively controlled yellow nutsedge at rates as low as 0.14 kg ha-1, but sicklepod was not controlled at rates up to 0.42 kg ha-1. F6285 controlled yellow nutsedge more effectively that standard treatments of metolachlor or imazethapyr, but crop injury from F6285 was greater (P≤0.05) than from other herbicides.

 Key Words Arachis hypogaea; , Cyperus esculentus; , peanut injury; , phytotoxicity