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April 18, 2026Pest Management Science0 citationsOpen Access

Fitness costs associated with Vip3Aa resistance on various hosts in Helicoverpa zea

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HKHaley KennedyDKDavid L. KernsGHGraham P Head

Key Points

  • The study aims to evaluate the fitness costs associated with Vip3Aa resistance in Helicoverpa zea on different host plants.
  • Compared survivorship and developmental time among Vip3A-resistant and susceptible H. zea strains
  • Measured pupal mass and reproductive success across three host plants
  • Analyzed differences in fitness metrics between resistant, susceptible, and heterozygous strains
  • Vip3A-resistant strains showed reduced survivorship compared to susceptible strains
  • Development time varied significantly, indicating delayed growth in resistant strains
  • Pupal mass and reproduction rates were lower in resistant strains, highlighting fitness costs

Abstract

Significant differences in survivorship, developmental time, pupal mass, and reproduction among the Vip3A-resistant (RR), -susceptible (SS) and -heterozygous (R♂S♀ and R♀S♂) H. zea strains on the three hosts, revealed clear evidence of fitness costs associated with Vip3Aa resistance. These findings support the value of abundant non-Bt refuges in limiting the evolution of H. zea resistance to Vip3Aa in the field. © 2026 The Author(s). Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.

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Cite This Study

Kennedy et al. (2026) studied this question.

synapsesocial.com/papers/69e3201440886becb653f209https://doi.org/10.1002/ps.70816
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