ArticleNeotropical entomology2025
Pathogenicity of the Entomopathogenic Fungus Metarhizium anisopliae s.l. (Ascomycota: Hypocreales) Against Sweetpotato Weevil (Cylas formicarius, Coleoptera: Brentidae) Under In Vitro Conditions.
Article in Neotropical entomology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The sweetpotato weevil, Cylas formicarius (Fabricius, 1798) (Coleoptera: Brentidae), is a serious pest of sweet potatoes, damaging crops in the field and during storage. Its cryptic nature limits chemical control. Entomopathogenic fungi (EPF) like Metarhizium anisopliae sensu lato (s.l.) (Metschnikoff) Sorokin, 1883 (Ascomycota: Hypocreales) offer eco-friendly alternatives. This study aimed to isolate and characterize a native M. anisopliae s.l. strain from infected C. formicarius using morphological and molecular methods and to evaluate its biocontrol potential against the weevil under in vitro conditions. Morphological characteristics and molecular analyses were used to confirm the identity of the isolate. Virulence was tested at three spore concentrations and compared with the commercial M. anisopliae s.l. strain ARSEF5369. Scanning electron microscopy (SEM) was employed to visualize the infection process. Enzyme activities (chitinase, protease) were quantified to compare virulence between strains. The effects of culture media and temperature on fungal growth and sporulation were investigated to optimize mass production conditions. The native isolate caused higher adult mortality (96.7, 93.3, and 50%) than the commercial strain at 1.2 × 10
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