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10 September 2021 Managing Fall Armyworm in Africa: Can Bt Maize Sustainably Improve Control?
Johnnie Van den Berg, Boddupalli M. Prasanna, Charles A. O. Midega, Pamela C. Ronald, Yves Carrière, Bruce E. Tabashnik
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Abstract

The recent invasion of Africa by fall armyworm, Spodoptera frugiperda, a lepidopteran pest of maize and other crops, has heightened concerns about food security for millions of smallholder farmers. Maize genetically engineered to produce insecticidal proteins from the bacterium Bacillus thuringiensis (Bt) is a potentially useful tool for controlling fall armyworm and other lepidopteran pests of maize in Africa. In the Americas, however, fall armyworm rapidly evolved practical resistance to maize producing one Bt toxin (Cry1Ab or Cry1Fa). Also, aside from South Africa, Bt maize has not been approved for cultivation in Africa, where stakeholders in each nation will make decisions about its deployment. In the context of Africa, we address maize production and use; fall armyworm distribution, host range, and impact; fall armyworm control tactics other than Bt maize; and strategies to make Bt maize more sustainable and accessible to smallholders. We recommend mandated refuges of non-Bt maize or other non-Bt host plants of at least 50% of total maize hectares for single-toxin Bt maize and 20% for Bt maize producing two or more distinct toxins that are each highly effective against fall armyworm. The smallholder practices of planting more than one maize cultivar and intercropping maize with other fall armyworm host plants could facilitate compliance. We also propose creating and providing smallholder farmers access to Bt maize that produces four distinct Bt toxins encoded by linked genes in a single transgene cassette. Using this novel Bt maize as one component of integrated pest management could sustainably improve control of lepidopteran pests including fall armyworm.

© The Author(s) 2021. Published by Oxford University Press on behalf of Entomological Society of America. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.
Johnnie Van den Berg, Boddupalli M. Prasanna, Charles A. O. Midega, Pamela C. Ronald, Yves Carrière, and Bruce E. Tabashnik "Managing Fall Armyworm in Africa: Can Bt Maize Sustainably Improve Control?," Journal of Economic Entomology 114(5), 1934-1949, (10 September 2021). https://doi.org/10.1093/jee/toab161
Received: 12 May 2021; Accepted: 30 July 2021; Published: 10 September 2021
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KEYWORDS
corn
genetically engineered crop
resistance management
smallholder farmer
Spodoptera frugiperda
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