Toxicity of Bacillus thuringiensis at different larval ages of Agrotis ipsilon (Lepidoptera: Noctuidae)

Nenhuma Miniatura disponível

Data

2020-01-01

Autores

Kaiser, Ingrid Schimidt
Lima, Victor Luiz Souza
Pratissoli, Dirceu
Machado, Lorena Contarini
de Freitas Bueno, Regiane Cristina Oliveira [UNESP]

Título da Revista

ISSN da Revista

Título de Volume

Editor

Resumo

The black cutworm Agrotis ipsilon (Hufnagel) (Lepidoptera: Noctuidae) is a cosmopolitan and polyphagous pest that attacks diverse crops and weed. One of the alternatives to insecticides may be the use of bioinsecticides based on Bacillus thuringiensis Berliner (Bt). Thus, the objective of the present study were evaluating the toxicity of Agree® and Dipel® bioinsecticides based on Bt on different larval ages of A. ipsilon. For the experiments, five larval ages were used (0-24, 48-72, 96-120, 144-168, and 192-216 h). The A. ipsilon caterpillars were individualized in acrylic tubes containing an artificial diet and 50 µL of each biopesticide in the concentration 1 × 108 spores mL-1. Mortality was assessed for seven days. The two bioinsecticides evaluated promoted mortality at all larval ages of A. ipsilon. The age of 0-24 h had mortality above 90%. The values of LC50 and LC90 were 9.8 × 105 and 7.4 × 106 spores mL-1 for Agree® and 1.3 × 106 e 1.4 × 107 spores mL-1 for Dipel®, respectively, without difference between LC50 and LC90 values of the bioinsecticides. The results indicate that younger caterpillars are more susceptible to Bt-based bioinsecticides.

Descrição

Palavras-chave

Bioinsecticide, Biological control, Black cutworm, Lethal concentration, Microbial control

Como citar

Revista de Ciencias Agroveterinarias, v. 19, n. 1, p. 118-121, 2020.

Coleções