Carnauba wax enhances the insecticidal activity of entomopathogenic fungi against the blowfly Lucilia sericata (Diptera: Calliphoridae)
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2020
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Blowfly, Lucilia sericata (Diptera: Calliphoridae), is a problematic synanthropic insect pest, a vector of microbial
pathogens, and the causal agent of secondary myiasis. Fungal biopesticides are considered eco-friendly tools,
alternative to synthetic pesticides, for the control of arthropod pests; however, to date, little is known about their
bioactivity against blowflies. In this study, we assessed the insecticidal activity of three well-known en tomopathogenic fungi, Beauveria bassiana, Beauveria pseudobassiana and Akanthomyces muscarius against L. ser icata. In addition, we tested powdered carnauba wax as an electrically charged dust carrier in an attempt to
enhance the virulence of fungal spores. Pathogenicity tests on adult flies, by adult immersion in conidial sus pension (108 conidia mL−1), showed that the median lethal time (LT50) was 5.3, 5.9, and 6.2 days for B. bassiana,
A. muscarius and B. pseudobassiana, respectively. In topical tests, when 108 dry conidia were mixed with or
without carnauba wax, the LT50 was 7.7, 10.2, and 14 days without this carrier and 6.9, 8.6, and 13.8 days with
it for B. bassiana, B. pseudobassiana and A. muscarius, respectively. Overall, our findings showed that, among the
tested fungi, B. bassiana was the most virulent when formulated as a dry powder with carnauba wax, which
greatly improved fungal efficacy against the blowfly. We discuss the utility of carnauba wax for electrostatic
formulation powder of fungal spores in the integrated management of blowflies as an environmentally sus tainable tool to reduce the over-reliance on chemical insecticides and their risk of resistance.
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Electrostatic powder, Beauveria bassiana, Akanthomyces muscarius, Beauveria pseudobassiana, Biological control, Dust formulation
Citação
MUNIZ, Elen R. et al. Carnauba wax enhances the insecticidal activity of entomopathogenic fungi against the blowfly Lucilia sericata (Diptera: Calliphoridae). Journal of Invertebrate Pathology, New York, v. 174, e107391, 2020. DOI: 10.1016/j.jip.2020.107391. Disponível em: https://www.sciencedirect.com/science/article/pii/S0022201120300975. Acesso em: 12 dez. 2024.