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Efficacy of a cry1Ab Gene for Control of Maruca vitrata (Lepidoptera: Crambidae) in Cowpea (Fabales: Fabaceae)

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Relation http://oar.icrisat.org/11722/
https://doi.org/10.1093/jee/toz367
doi:10.1093/jee/toz367
 
Title Efficacy of a cry1Ab Gene for Control of Maruca vitrata (Lepidoptera: Crambidae) in Cowpea (Fabales: Fabaceae)
 
Creator Peairs, F
Pittendrigh, B R
Hellmich, R L
Higgins, T J V
Beach, L R
Huesing, J E
Nemeth, M A
Onyekachi, F N
Adazebra, G A
Umar, M L
Saba, M
Traore, F
Dabiré-Binso, C L
Abudulai, M
Atokple, I D K
Bationo, J B
Ba, M N
Tignegre, J B
Ishiyaku, M F
Addae, P C
 
Subject Integrated Pest Management (IPM)
Cowpea
Legume Crops
West Africa
 
Description Cowpea [Vigna unguiculata (L) Walp.] is an important staple legume in the diet of many households in
sub-Saharan Africa. Its production, however, is negatively impacted by many insect pests including bean pod
borer, Maruca vitrata F., which can cause 20–80% yield loss. Several genetically engineered cowpea events
that contain a cry1Ab gene from Bacillus thuringiensis (Bt) for resistance against M. vitrata were evaluated in
Nigeria, Burkina Faso, and Ghana (West Africa), where cowpea is commonly grown. As part of the regulatory
safety package, these efficacy data were developed and evaluated by in-country scientists. The Bt-cowpea lines
were planted in confined field trials under Insect-proof netting and artificially infested with up to 500 M. vitrata
larvae per plant during bud formation and flowering periods. Bt-cowpea lines provided nearly complete pod
and seed protection and in most cases resulted in significantly increased seed yield over non-Bt control lines.
An integrated pest management strategy that includes use of Bt-cowpea augmented with minimal insecticide
treatment for protection against other insects is recommended to control pod borer to enhance cowpea
production. The insect resistance management plan is based on the high-dose refuge strategy where non-Btcowpea
and natural refuges are expected to provide M. vitrata susceptible to Cry1Ab protein. In addition, there
will be a limited release of this product until a two-toxin cowpea pyramid is released. Other than South African
genetically engineered crops, Bt-cowpea is the first genetically engineered food crop developed by the public
sector and approved for release in sub-Saharan Africa.
 
Publisher OXFORD UNIV PRESS INC
 
Date 2020-01
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://oar.icrisat.org/11722/1/Efficacy.pdf
Peairs, F and Pittendrigh, B R and Hellmich, R L and Higgins, T J V and Beach, L R and Huesing, J E and Nemeth, M A and Onyekachi, F N and Adazebra, G A and Umar, M L and Saba, M and Traore, F and Dabiré-Binso, C L and Abudulai, M and Atokple, I D K and Bationo, J B and Ba, M N and Tignegre, J B and Ishiyaku, M F and Addae, P C (2020) Efficacy of a cry1Ab Gene for Control of Maruca vitrata (Lepidoptera: Crambidae) in Cowpea (Fabales: Fabaceae). Journal of Economic Entomology (TSI), 113 (2). pp. 974-979. ISSN 0022-0493