Two juvenile hormone analogues, (E)-4-[(6,7-epoxy-3-ethyl-7-methyl-2-nonenyl) oxy] benzene and (E)-6,7-epoxy-1-(p-ethylphenoxy)–3,7-dimethyl-2-octene, were applied to the surface of natural breeding materials (feedlot debris in Nebraska and eelgrass in Florida) for the suppression ofStomoxys calcitrans(L.). The treatments inhibited 64–91% of the eclosion of adults in Nebraska and 95–99% in Florida.