Potentiality of Rhizospheric Fluorescent Pseudomonad Strains in Managing Sugar Beet Root-Infecting Fusarium oxysporum f.sp. betae

Document Type : Original Article

Authors

1 Plant Pathology Department, Faculty of Agriculture, Cairo University, Egypt.

2 Plant Pathology Research Institute, Agricultural Research Center, 12619, Giza, Egypt.

Abstract

The possible use of rhizobacterial fluorescent pseudomonads in control of Fusarium oxysporum f. sp. betae was investigated. Samples of rhizosphere collected from seven governorates raising sugar beet (Beta vulgaris L.) were subjected to study. A total number of 153 fluorescent isolates were recovered and selected by means of UV assay. Fifty-five isolates were found antagonistic to the target pathogen. Greenhouse testing for biological control revealed versatile reaction being promising at the early stages of experimentation, and negative effect 150 days after seeding was recorded. The case as a repeated event was attributed to the late progress of infection and late disease development. The results enough concluding the hazards of considering biological control at early stages of pathogenesis and/or the early stages of plant growth. Molecular speciation of five potent antagonists tested revealed identity with Pseudomonas aeruginosa, P. putida and P. fluorescens. The possible use of these rhizobacterial strains according to their prominent saprophytic soil nature, in biological control could be recommended.

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