Efficiency of Using Some Biological Organisms as Biological Catalysts to Reduce the Incidence of Cantaloupe Downy Mildew Disease Under Greenhouse Conditions

Infection of cantaloupe plant with Downy mildew caused by the fungus Pseudoperonospora cubensis leads to significant losses in amount crop, addition to, reducing its marketing value many countries around world, therefore, efficacy each organisms (Trichoderma harzianum, Trichoderma viride, Bacillus subtilis, megaterium and Pseudomonas fluorescens), fungicide Ridomil gold plus 71.5 WP for control downy under laboratory greenhouse conditions was studied, initially, conditions, results obtained showed that, when using bio filters, recommended concentration inhibit germination P. sporangia, a reduction rate pathogenic sporangia observed, also, treatment tested significantly reduced severity mildew, compared treatment, where, best these treatments disease use fungicide, while, were arranged according their efficiency following descending order: B. Ba. megaterium, fluorescens, T. viride In addition, plants increase growth parameters, example, (number leaves, leaf area total chlorophyll content), an yield components, For fruits/plant fruit weight /plant), above also increased activity defense-related enzymes, peroxidase polyphenol oxidase as well as, phenol content treatment.