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

Authored by Jose B Malaquias, Wesley A C Godoy, Adriano G Garcia, Francisco de S Ramalho, Celso Omoto

Date Published: 2017

DOI: 10.1038/s41598-017-16094-x

Sponsors: Brazilian National Council for Scientific and Technological Development (CNPq)

Platforms: C

Model Documentation: Other Narrative Mathematical description

Model Code URLs: Model code not found

Abstract

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.

Tags

behavior movement Brazil Field-evolved resistance Lepidoptera-noctuidae Bacillus-thuringiensis Ostrinia-nubilalis Vip3aa20 protein Video tracking Cry1f maize