Can Pyramids and Seed Mixtures Delay Resistance to Bt Crops?

Can Pyramids and Seed Mixtures Delay Resistance to Bt Crops? The primary strategy for delaying the evolution of pest resistance to transgenic crops that produce insecticidal proteins from Bacillus thuringiensis (Bt) entails refuges of plants that do not produce Bt toxins and thus allow survival of susceptible pests. Recent advances include using refuges together with Bt crop ‘pyramids’ that make two or more Bt toxins effective against the same pest, and planting seed mixtures yielding random distributions of pyramided Bt and non-Bt corn plants within fields. We conclude that conditions often deviate from those favoring the success of pyramids and seed mixtures, particularly against pests with low inherent susceptibility to Bt toxins. For these problematic pests, promising approaches include using larger refuges and integrating Bt crops with other pest management tactics. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Trends in Biotechnology Elsevier

Can Pyramids and Seed Mixtures Delay Resistance to Bt Crops?

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Publisher
Elsevier Current Trends
Copyright
Copyright © 2015 Elsevier Ltd
ISSN
0167-7799
D.O.I.
10.1016/j.tibtech.2015.12.011
Publisher site
See Article on Publisher Site

Abstract

The primary strategy for delaying the evolution of pest resistance to transgenic crops that produce insecticidal proteins from Bacillus thuringiensis (Bt) entails refuges of plants that do not produce Bt toxins and thus allow survival of susceptible pests. Recent advances include using refuges together with Bt crop ‘pyramids’ that make two or more Bt toxins effective against the same pest, and planting seed mixtures yielding random distributions of pyramided Bt and non-Bt corn plants within fields. We conclude that conditions often deviate from those favoring the success of pyramids and seed mixtures, particularly against pests with low inherent susceptibility to Bt toxins. For these problematic pests, promising approaches include using larger refuges and integrating Bt crops with other pest management tactics.

Journal

Trends in BiotechnologyElsevier

Published: Apr 1, 2016

References

  • Global diets link environmental sustainability and human health
    Tilman, D.; Clark, M.
  • Suppressing resistance to Bt cotton with sterile insect releases
    Tabashnik, B.E.
  • Peer-reviewed surveys indicate positive impact of commercialized GM crops
    Carpenter, J.E.
  • Commercialized transgenic traits, maize productivity and yield risk
    Shi, G.
  • Widespread adoption of Bt cotton and insecticide decrease promotes biocontrol services
    Lu, Y.
  • Insect resistance to Bt crops: lessons from the first billion acres
    Tabashnik, B.E.
  • Large-scale test of the natural refuge strategy for delaying insect resistance to transgenic Bt crops
    Jin
  • Fitness costs of insect resistance to Bacillus thuringiensis
    Gassmann, A.J.
  • Field-evolved resistance to Bt toxin Cry1Ac in the pink bollworm, Pectinophora gossypiella (Saunders) (Lepidoptera: Gelechiidae), from India
    Dhurua, S.; Gujar, G.T.
  • The evolution of resistance to two-toxin pyramid transgenic crops
    Ives, A.R.

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