Fungicides applied to soil or used as seed treatments and biocontrol agents were tested for 3 years in field experiments for efficacy against Rhizoctonia solani AG-4 in snap bean double-cropped with corn. In field plots infested artificially with R. solani AG-4, PCNB was as effective as flutolanil in increasing yield of green pods; however, flutolanil was more effective in reducing population densities of R. solani AG-4 in soil and on roots and in reducing hypocotyl disease. Tolclofos-methyl and mepronil were similar to PCNB in efficacy. The effects of the biocontrol agents Gliocladium virens, Trichoderma hamatum, a binucleate Rhizoctonia CAG-2, and Pseudomonas cepacia were inconsistent, but all showed significant efficacy against R. solani AG-4 in one of the years. However, G. virens, T. hamatum, and CAG-2 all reduced yield in one or more years in artificially or naturally infested soil. Laetisaria arvalis did not control R. solani AG-4.