Phosphine resistance in Tribolium castaneum and Rhyzopertha dominica from stored wheat in Oklahoma

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Show simple item record Opit, G. P. Phillips, Thomas W. Aikins, Michael J. Hasan, M. M. 2012-11-15T19:49:30Z 2012-11-15T19:49:30Z 2012-11-15
dc.description.abstract Phosphine gas, or hydrogen phosphide (PH[subscript 3]), is the most common insecticide applied to durable stored products worldwide and is routinely used in the United States for treatment of bulk-stored cereal grains and other durable stored products. Research from the late 1980s revealed low frequencies of resistance to various residual grain protectant insecticides and to phosphine in grain insect species collected in Oklahoma. The present work, which used the same previously established discriminating dose bioassays for phosphine toxicity as in the earlier study, evaluated adults of nine different populations of red flour beetle, Tribolium castaneum (Herbst), and five populations of lesser grain borer, Rhyzopertha dominica (F.) collected from different geographic locations in Oklahoma. One additional population for each species was a laboratory susceptible strain. Discriminating dose assays determined eight out of the nine T. castaneum populations, and all five populations of R. dominica, contained phosphine-resistant individuals, and highest resistance frequencies were 94 and 98%, respectively. DoseÐresponse bioassays and logit analyses determined that LC99 values were 3 ppm for susceptible and 377 ppm for resistant T. castaneum, and 2 ppm for susceptible and 3,430 ppm for resistant R. dominica. The most resistant T. castaneum population was 119-fold more resistant than the susceptible strain and the most resistant R. dominica population was over 1,500-fold more resistant. Results suggest a substantial increase in phosphine resistance in these major stored-wheat pests in the past 21 yr, and these levels of resistance to phosphine approach those reported for other stored-grain pest species in other countries. en_US
dc.language.iso en_US en_US
dc.relation.uri en_US
dc.rights Permission to archive granted by the Entomological Society of America, November 8, 2012. en_US
dc.subject Fumigation en_US
dc.subject Stored-product en_US
dc.subject Red flour beetle en_US
dc.subject Lesser grain borer en_US
dc.subject Phosphine resistance en_US
dc.title Phosphine resistance in Tribolium castaneum and Rhyzopertha dominica from stored wheat in Oklahoma en_US
dc.type Article (publisher version) en_US 2012 en_US
dc.citation.doi doi:10.1603/EC12064 en_US
dc.citation.epage 1114 en_US
dc.citation.issue 4 en_US
dc.citation.jtitle Journal of Economic Entomology en_US
dc.citation.spage 1107 en_US
dc.citation.volume 105 en_US
dc.contributor.authoreid twp1 en_US
dc.contributor.authoreid mja8338 en_US

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