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June 1, 2006Journal of Economic Entomology

Effect of Entomopathogenic Nematodes on the Fitness Cost of Resistance to Bt Toxin Cry1Ac in Pink Bollworm (Lepidoptera: Gelechiidae)

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Authors

AGAaron J. GassmannSSS. Patricia StockYCYves Carrière

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Overview

Laboratory study demonstrates that Steinernema riobrave increases mortality in Cry1Ac-resistant pink bollworms, suggesting biological control can delay pest resistance to transgenic crops.

Key Points

  • To determine whether exposure to the entomopathogenic nematode Steinernema riobrave increases the fitness costs associated with Cry1Ac resistance in pink bollworm (Pectinophora gossypiella).
  • Evaluated larval-to-adult mortality across Bt-resistant and susceptible strains of Pectinophora gossypiella exposed to 0, 2, 4, 8, and 14 infective juveniles of Steinernema riobrave per larva.
  • Assessed nematode establishment rates across all concentrations and measured reproduction output in infected fourth-instar larvae.
  • Mortality from fourth instar to adult eclosion was significantly higher in the Bt-resistant strain than in the susceptible strain when exposed to 2 to 14 infective juveniles per larva, whereas mortality did not differ between strains in the absence of nematodes.
  • Steinernema riobrave successfully established in larvae across all tested concentrations, with nematode reproduction occurring at densities between 4 and 14 infective juveniles per larva.

Cite This Study

Gassmann et al. (2006) studied this question.

synapsesocial.com/papers/6a89718441f4089922bd5db2https://doi.org/10.1093/jee/99.3.920
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Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1Fitness costs and biological adaptability of Cry toxin-resistant field strains of Pink bollworm, Pectinophora Gossypiella (Saunders) from India2025 · 5 citations
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  4. 4Field‐evolved resistance of pink bollworm, <i>Pectinophora gossypiella</i> (Saunders) (Lepidoptera: Gelechiidae), to transgenic <i>Bacillus thuringiensis</i> (<i>Bt</i>) cotton expressing crystal 1Ac (Cry1Ac) and Cry2Ab in India2018 · 161 citations
  5. 5Regional environment variations and management practices likely influence gut gene expression in Bt-resistant pink bollworm (Pectinophora gossypiella) from the northern and southern parts of India2025