Root rot /wilt incidence of Phaseolus vulgaris and antagonistic effect of Trichoderma. spp and Aspergillus terreus isolated from rhizosphere soil

Document Type : Original Article

Authors

1 Department of Botany (Plant Pathology), Faculty of Agriculture, South Valley University, 83523 Qena, Egypt.

2 Department of Botany (Microbiology), Faculty of Agriculture, South Valley University, 83523 Qena, Egypt

Abstract

Eleven isolates of Fusarium. sp was isolated from the naturally infected plants of beans by root rot. All isolated pathogenic fungi were morphologically characterised. The highest pathogenicity isolate was isolated named F-5 (qeft- 5) with 86% disease incidence percent, all the other isolates varied in disease incidence degree, therefore F-5 isolate was selected for subsequent experiments. F-5 was identified morphologically as Fusarium oxysporum. Four isolates of Trichoderma were identified as Trichoderma. harizunum, T. viridae, T. hamatum and T. asperllum   and one isolate of Aspergillus. terreus was isolated from rhizosphere soil a rounded healthy bean plant and examined for its ability to affect the linear growth of Fusarium oxysporum in vitro. Trichoderma species could significantly reduce the growth linear of (F. 5).  Inhibition percent of linear growth of Trichoderma.  harzianum was 66%, T. viride 68%, T. hamatum 74⁒, and T. asperllum was 80⁒, while Aspergillus terreus was 98%. To our knowledge, this is the first report of reporting a fungal pathogen producing severe root rot and vascular wilt in common beans, as well as the isolation of A. terreus from Upper Egypt's rhizosphere soil. It could be concluded that Aspergillus terreus isolated from healthy rhizosphere soil around healthy bean roots could suppress Fusarium oxysporum the casual agent of bean root rot in Upper-Egypt in vitro experiment.

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