Data/hora: 10/06/2024 16:58:49

Provedor de dados: | 63
País: | Brazil
Título: | Biological parameters of Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) assayed with Bacillus thuringiensis berliner
Autores: | Polanczyk,Ricardo Antonio; Alves,Sérgio Batista.
Data: | 2005-10-01
Ano: | 2005
Palavras-chave: | Entomopathogen; Fall armyworm; Sublethal effects.
Resumo: | The bacterium Bacillus thuringiensis (Bt) is a promising control agent of Spodoptera frugiperda (J.E. Smith). Besides the lethal effect on hosts, the entomopathogen may cause physiological alterations that hinder insects' feeding intake and reproduction. Larval and female pupa weight, oviposition and egg fecundity were determined in second instar S. frugiperda larvae infected with 39 Bt isolates in four bioassays. Sublethal effects were observed in the follow isolates: ESALQ 1.1, ESALQ 1.4, ESALQ 1.6, ESALQ 3.7, ESALQ 4.2 and ESALQ 5.2 (larval and female pupae weight); ESALQ 5.1 (larval weight); ESALQ 1.2 and ESALQ 3.7 (egg fecundity); ESALQ 3.7 (oviposition and egg fecundity); ESALQ 3.7 and ESALQ 5.2 (oviposition). Significant correlations were observed when parameters were analyzed together, except in the second bioassay (female pupal weight ´ oviposition, female pupal weight ´ egg fecundity and oviposition ´ egg fecundity). Some Bt isolates affected the biological parameters of S. frugiperda, mainly larval and female pupae weight, and in some instances these effects were passed on to further life cycle stages affecting oviposition and egg fecundity. Although sublethal effects are difficult to evaluate, mainly under field conditions, they should be considered when the activity of an entomopathogen is measured.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000500009
Editor: | São Paulo - Escola Superior de Agricultura "Luiz de Queiroz"
Relação: | 10.1590/S0103-90162005000500009
Formato: | text/html
Fonte: | Scientia Agricola  v.62 n.5 2005
Fonte: | info:eu-repo/semantics/openAccess