Candida guilliermondiivar.guilliermondiiwas the dominant yeast isolated from preharvest Georgia corn and comprised 3.6–47.0% of the total fungi as measured by dilution plating. The yeast was confined mainly to kernels visibly molded by filamentous fungi, primarilyFusarium moniliformeandAspergillus flavus. When grown in liquid shake culture,Cand.guilliermondiiwas unable to utilize starch. Growth of the yeast increased considerably when associated with amylolyticF.moniliformeorAsp.flavus. Utilization of starch hydrolyzates byCand.guilliermondiiin mixed cultures was reflected by a decrease in reducing sugar concentrations and a reduction in growth ofF.moniliformeandAsp.flavus. When glucose replaced starch as a carbon source,F.moniliformeandAsp.flavusdid not affect the maximum growth ofCand.guilliermondii. The association betweenCand.guilliermondiiand amylolytic filamentous fungi on preharvest corn is probably commensalistic.