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The cerambycid beetle  Hedypathes betulinus  (Klug) (Coleoptera: Cerambycidae) causes severe damage to yerba mate plants (  Ilex paraguariensis  (St. Hilaire) (Aquifoliales: Aquifoliaceae)), which results in large losses of production. In this study, the pathogenicity of entomopathogenic fungi of the species  Beauveria bassiana  (Balsamo-Crivelli) Vuillemin (Hypocreales: Cordycipitaceae),  Metarhizium anisopliae sensu lato  (Metschnikoff) Sorokin (Hypocreales: Clavicipitaceae), and  Purpureocillium lilacinum  (Thom) Luangsa-ard, Hywel-Jones, Houbraken and Samson (Hypocreales: Ophiocordycipitaceae) on yerba mate were evaluated. Fifteen isolates of  B. bassiana  , two of  M. anisopliae  , and seven of  P. lilacinum  on  H. betulinus  adults were analyzed under laboratory conditions. The raw mortality rate caused by  B. bassiana  isolates varied from 51.1 to 86.3%, and their LT  50  values varied between 8.7 and 13.6 d. The isolates of  M. anisopliae  caused 69.6‒81.8% mortality, and their LT  50  values varied between 7.4 and 7.9 d. In contrast, isolates of  P. lilacinum  were not pathogenic.  M. anisopliae  and  B. bassiana  isolates were pathogenic against  H. betulinus  adults, suggesting that they may be useful in biological control programs for insect pests of yerba mate.

journal of insect science

Susceptibility of adults of the cerambycid beetle Hedypathes betulinus to the entomopathogenic fungi Beauveria bassiana, Metarhizium anisopliae, and Purpureocillium lilacinum