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Background <p>The African migrating locust, known as <i>Locusta migratoria migratorioides</i> (Orthoptera: Acrididae), is a harmful pest that damages pastures and crops like millet, maize, beans, sweet potatoes, cassava, and vegetables. Two important fungi used for natural pest control are <i>Beauveria bassiana</i> and <i>Metarhizium anisopliae</i>. These fungi infect and kill insects, providing a safer and more effective alternative to traditional pesticides. They are especially valuable in integrated pest management (IPM) programs because they have minimal impact on other species and reduce reliance on chemical pesticides, which can cause pest resistance and harm the environment. The present study aimed to evaluate the activity of two native isolates of <i>B. bassiana</i> and <i>M. anisopliae</i> against the African migratory locust, <i>Locusta migratoria migratorioides.</i></p> Results <p>The maximum pathogenicity occurred at a concentration of (10<sup>9</sup>), resulting in 95% mortality for <i>B. bassiana</i> and 90% death for <i>M. anisopliae</i> for the treated nymphs, respectively. The study showed a good connection between the concentrations of the two fungi and the lethal activity of treated nymphs after seven days of treatment. Fertility and fecundity in the treated females significantly reduced ovarian development and yolk accumulation was both shown to be delayed in the treated female ovaries after histological examination.</p> Conclusion <p>The tested isolates demonstrated their pathogenicity against the African migrating locust, regardless of the concentrations used. These results were corroborated by histological anomalies in the female ovaries that received treatment.</p>

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The pathology of native entomopathogenic fungi, Beauveria bassiana and Metarhizium anisopliae (Hypocreales: Clavicipitaceae), on biological processes and ovarian structure of the African migratory locust, Locusta migratoria migratorioides (Orthoptera: Acrididae)

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  • 发表日期：

    2025年2月12日

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  • Zeinab Fathy,
  • Jihan Muhammad,
  • Sahar S. Ali

摘要

Background

The African migrating locust, known as Locusta migratoria migratorioides (Orthoptera: Acrididae), is a harmful pest that damages pastures and crops like millet, maize, beans, sweet potatoes, cassava, and vegetables. Two important fungi used for natural pest control are Beauveria bassiana and Metarhizium anisopliae. These fungi infect and kill insects, providing a safer and more effective alternative to traditional pesticides. They are especially valuable in integrated pest management (IPM) programs because they have minimal impact on other species and reduce reliance on chemical pesticides, which can cause pest resistance and harm the environment. The present study aimed to evaluate the activity of two native isolates of B. bassiana and M. anisopliae against the African migratory locust, Locusta migratoria migratorioides.

Results

The maximum pathogenicity occurred at a concentration of (109), resulting in 95% mortality for B. bassiana and 90% death for M. anisopliae for the treated nymphs, respectively. The study showed a good connection between the concentrations of the two fungi and the lethal activity of treated nymphs after seven days of treatment. Fertility and fecundity in the treated females significantly reduced ovarian development and yolk accumulation was both shown to be delayed in the treated female ovaries after histological examination.

Conclusion

The tested isolates demonstrated their pathogenicity against the African migrating locust, regardless of the concentrations used. These results were corroborated by histological anomalies in the female ovaries that received treatment.