A polyether antibiotic; active against a variety of bacteria, including 11 strains of S. aureus, three strains of S. pneumoniae, and E. faecalis (MICs = 0.12-0.5, 0.06, and 0.5 μg/ml, respectively); induces mortality in 80% of third instar S. eridania larvae when applied at 10 ppm to bean leaves