Susceptibility of Euschistus heros (Fabricius, 1798) (Hemiptera: Pentatomidae) nymphs to Bacillus spp. strains

Marcelo T. de Castro; Giovana C. Gomes; Breno B. dos R. Cunha; Gabriela T. Rocha; Antônia D. C. de L. Ferreira; Sandro C. L. Montalvão; Rose G. Monnerat

doi:10.37486/2675-1305.ec07028

Authors

Marcelo T. de Castro SoluBio Tecnologias Agrícolas, SoluScience, Brasília, DF, Brazil https://orcid.org/0000-0002-9147-8039
Giovana C. Gomes SoluBio Tecnologias Agrícolas, SoluScience, Brasília, DF, Brazil
Breno B. dos R. Cunha SoluBio Tecnologias Agrícolas, SoluScience, Brasília, DF, Brazil
Gabriela T. Rocha SoluBio Tecnologias Agrícolas, SoluScience, Brasília, DF, Brazil https://orcid.org/0000-0001-7313-8922
Antônia D. C. de L. Ferreira SoluBio Tecnologias Agrícolas, SoluScience, Brasília, DF, Brazil https://orcid.org/0000-0003-0650-2637
Sandro C. L. Montalvão SoluBio Tecnologias Agrícolas, SoluScience, Brasília, DF, Brazil https://orcid.org/0000-0002-0839-8848
Rose G. Monnerat Arbor Garden, Brasília, DF, Brazil https://orcid.org/0000-0001-7822-2525

DOI:

https://doi.org/10.37486/2675-1305.ec07028

Keywords:

Bacillus cereus, Bacillus thuringiensis, bioassays, biological control

Abstract

Soybean crops are subject to various phytophagous insects, among which the Neotropical brown stink bug Euschistus heros (Fabricius, 1798) (Hemiptera: Pentatomidae) stands out. The biological control of this pest is one of the viable alternatives to reduce the use of chemical insecticides. This study aimed to evaluate the pathogenic potential of different Bacillus spp. strains in the mortality of nymphs of E. heros under laboratory conditions. Bioassays were done using the artificial feeding system methodology with Falcon tubes, and seventeen Bacillus spp. strains were utilized. As a result, one strain of Bacillus thuringiensis caused 100% mortality, and the lethal concentration (LC₅₀) was estimated: 8.42 × 10⁴ spores/mL. In addition, two other strains of B. thuringiensis and one strain of Bacillus cereus caused mortality above 70%, and a Bacillus velezensis caused 55%.

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