Background Entomopathogenic fungi are primary pathogens that naturally affect insect pests by suppressing their populations and considered as an ecofriendly agents. The present study aimed to evaluate in vitro activity of different isolates of Beauveria bassiana and Metarhizium anisopliae against the development of larval stages of the Cucurbit fruit fly, Zeugodacus cucurbitae (Coquillett) (Diptera: Tephritidae). Results Larval mortality was significantly high with B. bassiana isolate Bb337 (5.82–21.70%) and with the lowest in M. anisopliae isolate MaD (1.49–6.33%). Pupal mortality rate was comparatively higher with more than 50%. The cadavers of all host instars produced conidia (sporulation). Sporulated dead larvae were significantly higher in Bb337 (61.10%) than at the least in MaD (18.60%) at 105 conidia/ml. At 108 conidia/ml, MaD induced the highest pupal cadavers with mycosis (32.42%). Regardless of applied fungal species, host instars mortality significantly increased with increasing concentration of B. bassiana isolates, suggesting a concentration-dependent response of Z. cucurbitae. Conclusion The tested isolates demonstrated their pathogenicity through vertical transmission of mycosis from one instar to another, regardless of the concentrations used.

https://doi.org/10.1186/s41938-023-00693-0

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Micheline HINTENOUhttps://orcid.org/0000-0002-6826-848X

Manuele Tamòhttps://orcid.org/0000-0002-5863-7421

https://doi.org/10.1186/s41938-023-00693-0

Nutrition and Human Health; Plant Production and Health

Agronomy; Disease Control; Food Security; Pests of Plants; Plant Breeding; Plant Diseases; Plant Health; Plant Production

Entomogenous Fungi; Biological Control; Metarhizium Anisopliae; Beauveria Bassiana; Tephritidae; Cucurbit Fruits

Africa; West Africa

Benin (Dahomey)

Headquarters and Western Africa Hub

Egyptian Journal of Biological Pest Control