Biocontrol of Fusarium oxysporum f. sp. vasinfectum With Bacillus spp. Strains

The wilt caused by Fusarium oxysporum f.sp. vasinfectum in cotton is one of the main diseases this crop. pathogen difficult to control because it produces chlamydospores, which allows survive soil for long periods without presence its host. disease based on varieties with some resistance, certified seeds, and fungicides used treat seeds. Thus, development alternatives needed increase number resources manage field. Bacillus are bioregulators antagonists several important phytopathogens. Therefore, objective work was select strains (Paenibacillus alvei, thuringiensis, B. megaterium, lentus), whose metabolites toxic F. laboratory greenhouse conditions, addition adjusting vitro methodologies perform evaluate selection tests. This determined best culture medium direct confrontation assays, proposed a grading scale facilitate decisions about dual tests, identified among selected assays those that produce volatile non-volatile oxysporum, tested these during seed germination trials. In last test, had potential protective effect