A microbiological control ofMelampsora medusae

摘要

Bacillus cereusFrankland and Frankland,Bacillus mycoidesFlugge, and a third unidentified species ofBacillusoccurred commonly as part of the saprophytic microflora on healthy foliage ofPseudotsuga menziesii(Mirb.) Franco. In greenhouse experiments, application of a mixture of nutrient broth cultures of these bacteria onP. menziesiiseedlings resulted in control of the needle rustMelampsora medusaeThuuml;m. Less effective control occurred when aqueous suspensions of the bacteria and cell-free (Millipore-filtered) filtrates of the nutrient broth cultures were applied to the seedlings, before inoculation.