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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Variation in resistance to pyrethroids in helicoverpa armigera from benin republic, West Africa
Journal of Economic Entomology, Volume 102, No. 5, Year 2009
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Description
Pyrethroid resistance in Helicoverpa armigera (Hbner) field populations was investigated in Benin over several years by using third- and fourth-instar larval topical bioassays. H. armigera was resistant to pyrethroids tested as cypermethrin, deltamethrin, bifenthrin, and fenvalerate. Pretreatment with piperonyl butoxide significantly decreased the LD50 value of cypermethrin and deltamethrin, and the resistance suppression by this synergist effect was observed. No significant decrease in the LD50 value was obtained when S,S,S-tributyl phosphoro-trithioate was applied before deltamethrin. In the field, cypermethrin's LD50 value varied, and the highest LD50 values were observed during the rainy season, the cotton, Gossypium hirsutum L., crop period, when pyrethroids are extensively used. In the dry season when there was no cotton cultivation, the lowest LD 50 values were obtained. However, reversion was never total in the field; resistance did not revert to the level we observed in the susceptible strain. In the laboratory, when field populations were reared in insecticide-free conditions, resistance decreased and total reversion was observed. Results are discussed with regard to insecticide resistance fitness cost and resistance management strategies. © 2009 Entomological Society of America.
Authors & Co-Authors
Djihinto, Angelo C.
Benin, Cotonou
Institut National Des Recherches Agricoles du Benin
Katary, André
Benin
Institut National Des Recherches Agricoles du Bnin
Prudent, Patrick
France, Paris
Cirad
Vassal, Jean Michel
France, Paris
Cirad
Vaissayre, Maurice
France, Paris
Cirad
Statistics
Citations: 31
Authors: 5
Affiliations: 3
Identifiers
Doi:
10.1603/029.102.0525
ISSN:
00220493
Study Locations
Multi-countries
Benin