pnut pnut Peanut Science 0095-3679 0095-3679 American Peanut Research and Education Society 10.3146/i0095-3679-21-2-12 Articles Chloroacetamide Herbicides and Chlorimuron Do Not Predispose Peanut (Arachis hypogaea) to Stem Rot (Sclerotium rolfsii)1 W. Carroll Johnson III *, Timothy B. Brenneman , and Benjamin G. Mullinix Jr. 2 Res. Agron. USDA-ARS, Assoc. Prof., and Agric. Res. Statistician, Coastal Plain Exp. Stn., Tifton, GA 31793-0748

1Cooperative investigation of the USDA Agric. Res. Serv. and the Univ. of Georgia Agric. Exp. Stn., Tifton. All programs and services of the USDA are offered on a nondiscriminatory basis without regard to race, color, national origin, religion, sex, age, marital status, or handicap. Mention of a trademark, proprietary product, or vendor does not constitute a guarantee or warranty of the product by the USDA or the Univ. of Georgia and does not imply its approval to the exclusion of other products or vendors that may also be suitable.

 *Corresponding author. 7 1994 21 2 126 129 30 9 1994 American Peanut Research and Education Society 1994 American Peanut Research and Education Society Abstract

Field studies were conducted from 1991 through 1993 at Plains, GA to determine the effect of chloroacetamide herbicides and chlorimuron on incidence of stem rot in peanut. The experimental site had a cropping history of more than 25 yr in continuous plantings of peanut and extremely high incidence of stem rot. Incidence of stem rot and peanut yield were not affected (P≤0.05) by chloroacetamide herbicides in 1991, 1992, and 1993. Chlorimuron applied 60 d after emergence had no effect on stem rot incidence or peanut yield. Paired plots treated with thifluzamide had very low stem rot incidence and 27% greater peanut yields. Based on these studies, neither chloroacetamide herbicides nor chlorimuron predisposed peanut to stem rot.

 Key Words Alachlor; , herbicide-disease interaction; , metolachlor; , thifluzamide