Larval Dispersal of Spodoptera frugiperda Strains on Bt Cotton: A Model for Understanding Resistance Evolution and Consequences for its Management

Autor(es)

Malaquias, Jose B. ^[1] ; Godoy, Wesley A. C. ^[1] ; Garcia, Adriano G. ^[1] ; Ramalho, Francisco de S. ^[2] ; Omoto, Celso ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Luiz de Queiroz Coll Agr ESALQ, Dept Entomol & Acarol, Ave Padua Dias 11, BR-13418900 Sao Paulo - Brazil

^[2] Embrapa Algodao, Oswaldo Cruz, 1-143, BR-58428095 Campina Grande, PB - Brazil

• Tipo de documento: Artigo Científico
• Fonte: SCIENTIFIC REPORTS; v. 7, NOV 23 2017.
• Citações Web of Science: 5

Resumo

High dispersal of Lepidoptera larvae between non-Bt and Bt cotton plants can favour the evolution of insect resistance; however, information on host acceptance of neonates in tropical transgenic crops is scarce. Therefore, the purposes of this study were as follows: (i) to investigate the feeding behaviour of susceptible and Cry1F-resistant strains of Spodoptera frugiperda (J.E. Smith) on Bt and non-Bt cotton (Gossypium hirsutum L.) varieties and (ii) to understand the possible effects of cotton field contamination on the dispersal and infestation capacity of S. frugiperda larvae by using an individual-based model. The main results of this paper are as follows: (1) the highest post-feeding larval dispersal of the Cry1F-resistant strain occurred at an exposure time of 18-24 h; (2) via video tracking assays, we found that the least distance moved was by larvae resistant to Cry1F on non-Bt cotton; and (3) the model indicated differences in mobility capacity between Bt and non-Bt cotton. We conclude that resistant neonates exhibit sedentary behaviour. Our report represents the first findings concerning the fitness cost of larval behaviour traits of S. frugiperda associated with Cry1F resistance in Brazilian populations. (AU)

• Processo FAPESP: 14/16609-7 - Abordagem multi e interdisciplinar para compreender padrões espaço-temporais de insetos praga e delinear paisagens para manejo sustentável de pragas em sistemas agrícolas tropicais
• Beneficiário: Wesley Augusto Conde Godoy
• Linha de fomento: Auxílio à Pesquisa - Temático
• Processo FAPESP: 15/20380-8 - Modelagem ecológica da dispersão larval de Spodoptera frugiperda (Lepidoptera: Noctuidae) em algodão Bt: implicações para evolução e manejo da resistência
• Beneficiário: José Bruno Malaquias
• Linha de fomento: Bolsas no Brasil - Doutorado