In vitroevaluations indicated that almost all fungicides and some insecticides and herbicides registered for use on soybeans inhibited growth of the entomopathogenic fungiNomuraea rileyi(Farlow) Samson even at concentrations1/10the recommended rate. Most insecticides and herbicides were either not deleterious toN. rileyior less deleterious than fungicides. Also, death due to mycoses was significantly reduced when cabbage looper larvae were exposed to conidia treated with either the fungicide benomyl or the herbicide dinoseb.