TY - JOUR T1 - Transgenic Bt Corn, Soil Insecticide, and Insecticidal Seed Treatment Effects on Corn Rootworm (Coleoptera: Chrysomelidae) Beetle Emergence, Larval Feeding Injury, and Corn Yield in North Dakota. AU - Calles-Torrez,Veronica, AU - Knodel,Janet J, AU - Boetel,Mark A, AU - Doetkott,Curt D, AU - Podliska,Kellie K, AU - Ransom,Joel K, AU - Beauzay,Patrick, AU - French,B Wade, AU - Fuller,Billy W, PY - 2017/04/12/received PY - 2017/12/1/pubmed PY - 2018/10/12/medline PY - 2017/11/30/entrez KW - Cry protein KW - Diabrotica barberi KW - Diabrotica virgifera virgifera KW - emergence KW - resistance SP - 348 EP - 360 JF - Journal of economic entomology JO - J Econ Entomol VL - 111 IS - 1 N2 - Northern, Diabrotica barberi Smith & Lawrence (Coleoptera: Chrysomelidae), and western, Diabrotica virgifera virgifera LeConte (Coleoptera: Chrysomelidae), corn rootworms are economic pests of corn, Zea mays L. in North America. We measured the impacts of corn hybrids incorporated with Cry3Bb1, Cry34/35Ab1, and pyramided (Cry3Bb1 + Cry34/35Ab1) Bacillus thuringiensis Berliner (Bt) proteins, tefluthrin soil insecticide, and clothianidin insecticidal seed treatment on beetle emergence, larval feeding injury, and corn yield at five locations from 2013 to 2015 in eastern North Dakota. In most cases, emergence was significantly lower in Bt-protected corn than in non-Bt corn hybrids. Exceptions included Wyndmere, ND (2013), where D. barberi emergence from Cry34/35Ab1 plots was not different from that in the non-Bt hybrid, and Arthur, ND (2013), where D. v. virgifera emergence from Cry3Bb1 plots did not differ from that in the non-Bt hybrid. Bt hybrids generally produced increased grain yield compared with non-Bt corn where rootworm densities were high, and larval root-feeding injury was consistently lower in Bt-protected plots than in non-Bt corn. The lowest overall feeding injury and emergence levels occurred in plots planted with the Cry3Bb1 + Cry34/35Ab1 hybrid. Time to 50% cumulative emergence of both species was 5-7 d later in Bt-protected than in non-Bt hybrids. Tefluthrin and clothianidin were mostly inconsequential in relation to beetle emergence and larval root injury. Our findings could suggest that some North Dakota populations could be in early stages of increased tolerance to some Bt toxins; however, Bt corn hybrids currently provide effective protection against rootworm injury in eastern North Dakota. SN - 1938-291X UR - https://www.unboundmedicine.com/medline/citation/29186516/Transgenic_Bt_Corn_Soil_Insecticide_and_Insecticidal_Seed_Treatment_Effects_on_Corn_Rootworm__Coleoptera:_Chrysomelidae__Beetle_Emergence_Larval_Feeding_Injury_and_Corn_Yield_in_North_Dakota_ DB - PRIME DP - Unbound Medicine ER -