Abstract: Six antioxidants were tested in vitro and in vivo against seed-borne fungi of peanut. Hydroquinone showed a highly significant effect on the growth of the following fungi: Cephalosporium sp., Fusarium moniliforme, F. oxysporum, F. solani, Rhizoctonia solani, Sclerotium bataticola and Verticillium sp. Soaking peanut seeds in a 20 mM water solution of hydroquinone for 12 hours before planting significantly decreased pre- and post-emergence damping off incited by all tested fungi. Seedling survival and plant vigor in all treatments, including the check, was increased.