Technical Abstract: Effects of combining entomopathogenic nematodes with other entomopathogens on ability to suppress pecan weevil larvae, Curculio caryae, were determined in the laboratory. Heterorhabditis indica or Steinernema carpocapsae was applied with Beauveria bassiana, Matarhizium anisopliae, Paecilomyces fumosoroseus, or Serratia marcescens. Antagnonism was observed in all pathogen combinations, except H. indica combined with M. anisopliae, and depending on rate, S. carpocapsae combined with B. bassiana or S. marcescens, for which additive effects were observed. The combination of H. indica and M. anisopliae may merit further study in other systems. Steinernema carpocapsae (applied alone) generally caused greater mortality than other pathogens applied alone. Paecilomyces fumosoroseus and S. marcescens were not pathogenic to C. caryae when applied alone. It was concluded that there would be little or no benefit to applying the pathogens in combination for C. caryae larval control.