Data/hora: 13/06/2024 03:47:51

Biblioteca(s): | Embrapa Milho e Sorgo.
Data corrente: | 08/11/2022
Data da última atualização: | 22/03/2023
Autoria: | CARVALHO, K. S. de; LEITE, N. A.; MENDES, S. M.; LANA, U. G. de P.; VALICENTE, F. H.
Afiliação: | KARINE SILVA DE CARVALHO, Universidade Federal de Lavras; NATÁLIA ALVES LEITE, Universidade Federal do Rio Grande do Sul; SIMONE MARTINS MENDES, CNPMS; UBIRACI GOMES DE PAULA LANA, CNPMS; FERNANDO HERCOS VALICENTE, CNPMS.
Título: | Toxicity of Bacillus thuringiensis strains to six lepidopteran pests of Brazilian agricultural landscape.
Ano de publicação: | 2022
Fonte/Imprenta: | Neotropical Entomology, v. 51, n. 6, p. 869-876, 2022.
DOI: | https://doi.org/10.1007/s13744-022-00996-1
Idioma: | Inglês
Conteúdo: | The first step for biological insecticide production is the evaluating of the pathogenicity and strains virulence of entomopathogens against the target pests. Bacillus thuringiensis (Bt) is widespread in nature, lethal pathogen of a range of orders and the most widely used entomopathogenic biological control agent. Therefore, our objective was to study the susceptibility of six important lepidopteran pests in Brazilian agricultural production systems, Anticarsia gemmatalis (Hubner), Chrysodeixis includens (Walker) Helicoverpa armigera (Hubner), Spodoptera cosmioides (Walker), S. eridania (Cramer), and S. frugiperda (Smith), to Bt strains. In vitro bioassays were conducted with neonate larvae exposed to two Bt strains, 1680A and 775E, in seven concentrations of spores and protein crystals. After 7 days, the mortality was evaluated and indicated that lethal concentration (LC50) for 775E strain ranged from 7.72 x 10(4) to 2.45 x 10(6) spores mL(-1) and for 1608A strain from 5.63 x 10(3) to 1.21 x 10(6) spores mL(-1). The strain 1608A was more toxic for A. gemmatalis and H. armigera than 775E strain, and then was further evaluated in greenhouse bioassays with maize and soybean plants infested separately with target insects. The strain 1608A showed an efficient control for most insect species studied in the greenhouse bioassays, promoting considerable reduction in leaf injury and demonstrating a high potential in biological control of important lepidopteran species in crop production systems in Brazil.
Palavras-Chave: | Concentração letal; Suscetibilidade.
Thesagro: | Controle Biológico; Inseticida; Inseto; Lepidóptero; Praga.
Categoria do assunto: | O Insetos e Entomologia
Registro original: | Embrapa Milho e Sorgo (CNPMS)
Exemplares: | CNPMS - (29902-1) - UPC - AP - DD -  -  -  - DIS