Linha básica de suscetibilidade de Spodoptera frugiperda (Lepidoptera: Noctuidae) a Lufenuron na cultura do milho. / Baseline susceptibility of Spodoptera frugiperda (Lepidoptera: Noctuidae) to Lufenuron in corn.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2002

RESUMO

Lufenuron is a newly benzoylphenyl urea chitin synthesis inhibitor insecticide. The use of this compound to control Spodoptera frugiperda J. E. Smith (Lepidoptera: Noctuidae) has increased significantly in the past years. This increase can be attributed to its high activity against S. frugiperda and to the reduction of efficacy due to resistance to some traditional insecticides (such as phosphates, carbamates and pyrethroids) recommended for controlling this pest. In this study, a baseline susceptibility data of S. frugiperda populations to lufenuron were obtained for implementing a proactive resistance management program. An artificial diet treatment surface bioassay was used to characterize the response to lufenuron in a susceptible strain. Second and third instar larvae were exposed to the treated diet up to 5 days (120 h). A period of 4 days (96 h) and third instar larvae were defined as standard procedures for bioassays. After the characterization of the susceptible population, diagnostic concentrations of 3.2 and 10.0 mg of lufenuron / mL of distilled water were chosen for monitoring the susceptibility. A survey of susceptibility to lufenuron was conducted in field populations of S. frugiperda collected from major corn-growing regio ns located in the States of Rio Grande do Sul, Paraná, São Paulo, Goiás and Minas Gerais. Significant differences in susceptibility to lufenuron were detected among S. frugiperda populations. These results suggest the need to implement resistance management strategies to preserve the lifetime of lufenuron for controlling S. frugiperda in Brazil.

ASSUNTO(S)

inseticidas lagarta-do-cartucho pesticide resistance corn fall armyworm insecticide resistência ao inseticida milho

ACESSO AO ARTIGO

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