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Effects of a Bt-based insecticide on the functional response ofCeraeochrysa cinctapreying onPlutella xylostella

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Autor(es):
de Oliveira Pimenta, Isabela Cristina [1] ; da Silva Nunes, Gilmar [2] ; de Magalhaes, Gustavo Oliveira [2] ; dos Santos, Nathalia Alves [3] ; Pinto, Matheus Moreira Dantas [2] ; De Bortoli, Sergio Antonio [2]
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] Sao Luis Fac Educ, Jaboticabal, SP - Brazil
[2] Sao Paulo State Univ, Fac Agr & Vet Sci, Jaboticabal, SP - Brazil
[3] Univ Sao Paulo, Fac Philosophy Sci & Letters Ribeirao Preto, Ribeirao Preto, SP - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: ECOTOXICOLOGY; v. 29, n. 7, p. 856-865, SEP 2020.
Citações Web of Science: 0
Resumo

Plutella xylostella, is the main pest infestingBrassicacrops, and products based onBacillus thuringiensis(Bt) are frequently used in strategies for its biocontrol. The present study aimed to evaluate whether a Bt-based bioinsecticide affects the predation behavior ofCeraeochrysa cinctawhen preying onP. xylostella. Three larval instars of the predator and the eggs and second-instar larvae of the moth were used, with the prey either untreated or treated with a Bt-based product (Xentari (R)). Results showed that, the first larval instar ofC. cinctapresented a type II functional response when preying upon untreated eggs, and a type III response when preying upon Bt-treated eggs, while the second and third instars presented type II and III responses, respectively, in both situations. The predator's first and third larval instars presented a type II functional response when preying upon untreated larvae and a type III response when preying upon Bt-treated larvae. However, the predator's second-instar larvae showed a type II response in both treatments. The results obtained allowed us to conclude that the Bt-based insecticide tested affects the predation behavior of the first-instar larvae ofC. cinctaon eggs and of both the first- and third-instar larvae of this predator onP. xylostellalarvae. (AU)

Processo FAPESP: 18/10246-0 - Efeito do estresse hídrico na composição química de brassicáceas e seus efeitos sobre Plutella xylostella (L., 1795) (Lepidoptera: Plutelldae)
Beneficiário:Isabela Cristina de Oliveira Pimenta
Modalidade de apoio: Bolsas no Brasil - Programa Capacitação - Treinamento Técnico