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Extended Sentinel Monitoring of Helicoverpa zea Resistance to Cry and Vip3Aa Toxins in Bt Sweet Corn: Assessing Changes in Phenotypic and Allele Frequencies of Resistance

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dc.contributor.authorDively, Galen P.en
dc.contributor.authorKuhar, Tom P.en
dc.contributor.authorTaylor, Sally V.en
dc.contributor.authorDoughty, Heleneen
dc.contributor.authorHolmstrom, Kristianen
dc.contributor.authorGilrein, Daniel O.en
dc.contributor.authorNault, Brian A.en
dc.contributor.authorIngerson-Mahar, Josephen
dc.contributor.authorHuseth, Andersen
dc.contributor.authorReisig, Dominicen
dc.contributor.authorFleischer, Shelbyen
dc.contributor.authorOwens, Daviden
dc.contributor.authorTilmon, Kelleyen
dc.contributor.authorReay-Jones, Francisen
dc.contributor.authorPorter, Paten
dc.contributor.authorSmith, Jocelynen
dc.contributor.authorSaguez, Julienen
dc.contributor.authorWells, Jasonen
dc.contributor.authorCongdon, Caitlinen
dc.contributor.authorByker, Hollyen
dc.contributor.authorJensen, Bryanen
dc.contributor.authorDiFonzo, Chrisen
dc.contributor.authorHutchison, William D.en
dc.contributor.authorBurkness, Ericen
dc.contributor.authorWright, Roberten
dc.contributor.authorCrossley, Michaelen
dc.contributor.authorDarby, Heatheren
dc.contributor.authorBilbo, Tomen
dc.contributor.authorSeiter, Nicholasen
dc.contributor.authorKrupke, Christianen
dc.contributor.authorAbel, Craigen
dc.contributor.authorCoates, Brad S.en
dc.contributor.authorMcManus, Bradleyen
dc.contributor.authorFuller, Billyen
dc.contributor.authorBradshaw, Jeffreyen
dc.contributor.authorPeterson, Julie A.en
dc.contributor.authorBuntin, Daviden
dc.contributor.authorPaula-Moraes, Silvanaen
dc.contributor.authorKesheimer, Katelynen
dc.contributor.authorCrow, Whitneyen
dc.contributor.authorGore, Jeffreyen
dc.contributor.authorHuang, Fangnengen
dc.contributor.authorLudwick, Dalton C.en
dc.contributor.authorRaudenbush, Amyen
dc.contributor.authorJimenez, Sebastianen
dc.contributor.authorCarrière, Yvesen
dc.contributor.authorElkner, Timothyen
dc.contributor.authorHamby, Kellyen
dc.date.accessioned2023-07-28T14:49:16Zen
dc.date.available2023-07-28T14:49:16Zen
dc.date.issued2023-06-25en
dc.date.updated2023-07-28T12:21:28Zen
dc.description.abstractTransgenic corn and cotton that produce Cry and Vip3Aa toxins derived from <i>Bacillus thuringiensis</i> (Bt) are widely planted in the United States to control lepidopteran pests. The sustainability of these Bt crops is threatened because the corn earworm/bollworm, <i>Helicoverpa zea</i> (Boddie), is evolving a resistance to these toxins. Using Bt sweet corn as a sentinel plant to monitor the evolution of resistance, collaborators established 146 trials in twenty-five states and five Canadian provinces during 2020&ndash;2022. The study evaluated overall changes in the phenotypic frequency of resistance (the ratio of larval densities in Bt ears relative to densities in non-Bt ears) in <i>H. zea</i> populations and the range of resistance allele frequencies for Cry1Ab and Vip3Aa. The results revealed a widespread resistance to Cry1Ab, Cry2Ab2, and Cry1A.105 Cry toxins, with higher numbers of larvae surviving in Bt ears than in non-Bt ears at many trial locations. Depending on assumptions about the inheritance of resistance, allele frequencies for Cry1Ab ranged from 0.465 (dominant resistance) to 0.995 (recessive resistance). Although Vip3Aa provided high control efficacy against <i>H. zea</i>, the results show a notable increase in ear damage and a number of surviving older larvae, particularly at southern locations. Assuming recessive resistance, the estimated resistance allele frequencies for Vip3Aa ranged from 0.115 in the Gulf states to 0.032 at more northern locations. These findings indicate that better resistance management practices are urgently needed to sustain efficacy the of corn and cotton that produce Vip3Aa.en
dc.description.versionPublished versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationDively, G.P.; Kuhar, T.P.; Taylor, S.V.; Doughty, H.; Holmstrom, K.; Gilrein, D.O.; Nault, B.A.; Ingerson-Mahar, J.; Huseth, A.; Reisig, D.; Fleischer, S.; Owens, D.; Tilmon, K.; Reay-Jones, F.; Porter, P.; Smith, J.; Saguez, J.; Wells, J.; Congdon, C.; Byker, H.; Jensen, B.; DiFonzo, C.; Hutchison, W.D.; Burkness, E.; Wright, R.; Crossley, M.; Darby, H.; Bilbo, T.; Seiter, N.; Krupke, C.; Abel, C.; Coates, B.S.; McManus, B.; Fuller, B.; Bradshaw, J.; Peterson, J.A.; Buntin, D.; Paula-Moraes, S.; Kesheimer, K.; Crow, W.; Gore, J.; Huang, F.; Ludwick, D.C.; Raudenbush, A.; Jimenez, S.; Carrière, Y.; Elkner, T.; Hamby, K. Extended Sentinel Monitoring of Helicoverpa zea Resistance to Cry and Vip3Aa Toxins in Bt Sweet Corn: Assessing Changes in Phenotypic and Allele Frequencies of Resistance. Insects 2023, 14, 577.en
dc.identifier.doihttps://doi.org/10.3390/insects14070577en
dc.identifier.urihttp://hdl.handle.net/10919/115933en
dc.language.isoenen
dc.publisherMDPIen
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectcorn earwormen
dc.subjectbollwormen
dc.subjectresistance monitoringen
dc.subjectBacillus thuringiensis toxinsen
dc.subjectphenotypic and allele resistance frequencyen
dc.titleExtended Sentinel Monitoring of Helicoverpa zea Resistance to Cry and Vip3Aa Toxins in Bt Sweet Corn: Assessing Changes in Phenotypic and Allele Frequencies of Resistanceen
dc.title.serialInsectsen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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