Zone of inhibition tests conducted on agar plates indicated that both metabolite treatments were toxic to A. tabescens (F = 19.23; df = 2, 15; P < 0.0001 for the P. luminescens metabolite assay, and F = 48.0; df = 2, 6; P = 0.0002 for the X. bovienii assay) (Fig. 3).