Spore-forming bacteria, a major group among potential antagonists isolated from natural sources such as termitaria soil and composts used by organic farmers

摘要: A recently published method allowed counting of both total number microorganisms and those antagonistic to a disease causing fungus in naturally occurring materials such as composts. Using this Fusarium solani, cause black root rot chickpea, the target fungus, five nine (termitaria soil, compost from leaf litter kitchen waste, debris leaf-axil plants Billbergia sp. six composts used by organic farmers called biodynamic (BD) preparations (BD500, BD502, BD503, BD504, BD505, BD506)) were found have high population (4.28 log10 6.98 g-1 material) bacteria. Fifty-five (82%) 67 isolates Gram-positive spore-forming rods rest non-sporulating. All 55 bacteria survived for at least 108 days desiccator; 20 17 months. Antagonistic surviving desiccation long periods can potentially be dry formulations biological control agents. The presence large numbers spore forming these different appears responsible reported low pest incidence farms using BD preparations. Thirty-five showed commensal behaviour towards groundnut rhizobia, under vitro conditions. Eleven studied Biolog kit. Only one, BCB 103, was identified Bacillus thermoglucosidasius, others did not match any 23 species (including B. thuringiensis) its database