Pest management science · 2025
Potential of endophytic Beauveria bassiana against Coraebus (Coleoptera: Buprestidae) oak borers.
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Morda Walaa, Vinci Alessia, Lentini Andrea, Mannu Roberto, Olivieri Maurizio, Ruiu Luca
Аннотация
BACKGROUND: Oak borers in the genus Coraebus, including the bark- and the wood-boring beetles C. florentinus and C. undatus, are major pests of the cork oak tree Quercus suber, and when their population densities are high, effective forest protection measures become critical. The endophagous behaviour of Coraebus species and the limited understanding of their biology, hamper the development of timely and effective management strategies.
RESULTS: The novel strain UNISS22 of the entomopathogenic fungus Beauveria bassiana, isolated from the forest ecosystem, demonstrated strong insecticidal potential against the model coleopteran Tenebrio molitor and the two target Coraebus species, achieving up to 100% mortality in both larvae and adults, with efficacy shown to be concentration-dependent. Beauveria bassiana UNISS22 was found to exhibit endophytic behaviour in Quercus plants and to possess a distinctive ability to produce increased fungal biomass. Genomic analyses revealed a set of genes encoding proteins related to the insecticidal potential, including genes involved in adhesion to the host (adhesins and hydrophobins), in penetration and infection (chitinases, proteases and subtilases), and in the synthesis of bioactive secondary metabolites. Gene sequence analyses revealed a significant level of divergence in strain UNISS22, supporting the presence of distinct biological properties and functional potential compared with other B. bassiana strains.
CONCLUSION: The biological properties and insecticidal potential of B. bassiana strain UNISS22 provide valuable insights for developing eco-friendly, integrated management strategies to protect forests from Coraebus beetle infestations. © 2025 The Author(s). Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
RESULTS: The novel strain UNISS22 of the entomopathogenic fungus Beauveria bassiana, isolated from the forest ecosystem, demonstrated strong insecticidal potential against the model coleopteran Tenebrio molitor and the two target Coraebus species, achieving up to 100% mortality in both larvae and adults, with efficacy shown to be concentration-dependent. Beauveria bassiana UNISS22 was found to exhibit endophytic behaviour in Quercus plants and to possess a distinctive ability to produce increased fungal biomass. Genomic analyses revealed a set of genes encoding proteins related to the insecticidal potential, including genes involved in adhesion to the host (adhesins and hydrophobins), in penetration and infection (chitinases, proteases and subtilases), and in the synthesis of bioactive secondary metabolites. Gene sequence analyses revealed a significant level of divergence in strain UNISS22, supporting the presence of distinct biological properties and functional potential compared with other B. bassiana strains.
CONCLUSION: The biological properties and insecticidal potential of B. bassiana strain UNISS22 provide valuable insights for developing eco-friendly, integrated management strategies to protect forests from Coraebus beetle infestations. © 2025 The Author(s). Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.