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<p>The effects of silver nanoparticle (AgNP)/carboxymethyl cellulose (CMC), AgNP/chitosan/oleic acid (OLE), AgNP/chitosan/OLE/acetic acid (AA), certain antibiotics, commercial chemicals, nematicides, and bioagent products on four isolates of&#xa0;Egyptian crown gall bacteria, <i>Agrobacterium tumefaciens</i>, and the second-stage juveniles (J<sub>2</sub>) of root-knot nematode (<i>Meloidogyne incognita</i>) which cause complex disease in guava plants cultivated in Beheira Governorate, Egypt, were investigated. The results revealed that AgNP/CMC, AgNP/chitosan/OLE, and AgNP/chitosan/OLE/AA had bactericidal effects against the tested <i>A. tumefaciens</i> isolates. Based on the results obtained, AA was determined to have the maximum efficacy against J<sub>2</sub> of <i>Meloidogyne incognita</i> with total egg mass destruction, while complete mortalities of J<sub>2</sub> were recorded following treatment with nematicides. All antibiotics had bacteriostatic effects against the isolate EAt4, except streptomycin which showed bactericidal effects. The isolates varied in their responses to the commercial chemicals, and <i>A. tumefaciens</i> (RAt1) was resistant to concentrations ranging from 1 to 9% of the tested nematicides. The present findings recommend the use of silver nanoparticles, AA, NaOCl, Clorox or streptomycin to manage complex diseases. These findings may serve as a framework for further research aimed at the improvement of complex diseases control in guava.</p>

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Characterization and management of crown gall bacterium and root-knot nematode as a complex disease infecting guava plants

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月18日

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  • Mohamed A. Elsaedy,
  • Khaled A. Osman,
  • Amira M. Younis,
  • Alia A. Shoeib

摘要

The effects of silver nanoparticle (AgNP)/carboxymethyl cellulose (CMC), AgNP/chitosan/oleic acid (OLE), AgNP/chitosan/OLE/acetic acid (AA), certain antibiotics, commercial chemicals, nematicides, and bioagent products on four isolates of Egyptian crown gall bacteria, Agrobacterium tumefaciens, and the second-stage juveniles (J2) of root-knot nematode (Meloidogyne incognita) which cause complex disease in guava plants cultivated in Beheira Governorate, Egypt, were investigated. The results revealed that AgNP/CMC, AgNP/chitosan/OLE, and AgNP/chitosan/OLE/AA had bactericidal effects against the tested A. tumefaciens isolates. Based on the results obtained, AA was determined to have the maximum efficacy against J2 of Meloidogyne incognita with total egg mass destruction, while complete mortalities of J2 were recorded following treatment with nematicides. All antibiotics had bacteriostatic effects against the isolate EAt4, except streptomycin which showed bactericidal effects. The isolates varied in their responses to the commercial chemicals, and A. tumefaciens (RAt1) was resistant to concentrations ranging from 1 to 9% of the tested nematicides. The present findings recommend the use of silver nanoparticles, AA, NaOCl, Clorox or streptomycin to manage complex diseases. These findings may serve as a framework for further research aimed at the improvement of complex diseases control in guava.