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Geographic Distribution of Bacillus thuringiensis Cry1F Toxin Resistance in Western Bean Cutworm (Lepidoptera: Noctuidae) Populations in the United States

文献类型： 外文期刊

作者： Coates, Brad S. 1 ; Abel, Craig A. 1 ; Swoboda-Bhattarai, Katharine A. 2 ; Palmquist, Debra E. 3 ; Montezano, De 1 ;

作者机构： 1.USDA ARS, Corn Insects & Crop Genet Res Unit, Ames, IA 50011 USA

2.Univ Nebraska Lincoln, West Cent Res & Extens Ctr, Dept Entomol, North Platte, NE 69101 USA

3.USDA ARS, Midwest Area Off, Peoria, IL USA

4.Kansas State Univ, Southwest Res & Extens Ctr, Dept Entomol, Garden City, KS 67846 USA

5.Jilin Acad Agr Sci, Plant Protect Inst, Changchun 130033, Jilin, Peoples R China

6.Univ Nebraska Lincoln, Panhandle Res & Extens Ctr, Dept Entomol, Scottsbluff, NE 69361 USA

7.Michigan State Univ, Coll Nat Sci, E Lansing, MI 48824 USA

8.Cornell Univ, Dept Entomol, Ithaca, NY 14850 USA

9.Ohio State Univ, Wooster, OH 44691 USA

10.Univ Nebraska Lincoln, Dept Entomol, Haskell Agr Lab, Concord, NE 68728 USA

关键词： insecticidal protein toxin; resistance

期刊名称：JOURNAL OF ECONOMIC ENTOMOLOGY （ 影响因子：2.381； 五年影响因子：2.568 ）

ISSN： 0022-0493

年卷期： 2020 年 113 卷 5 期

页码：

收录情况： SCI

摘要： The western bean cutworm (WBC), Striacosta albicosta (Lepidoptera: Noctuidae), can be a severe pest of transgenic corn in the western Plains and Great Lakes regions of North America, including on hybrids expressing the Bacillus thuringiensis (Bt) Cry1F toxin. The level and geographic distribution of Cry1F resistance are not completely known. Neonate S. albicosta from 10 locations between Nebraska and New York state were subjected to dose-response trypsin-activated native Cry1F toxin overlay bioassays. In 2017, the mean estimated lethal concentration causing 50% larval mortality (LC50) ranged from 15.1 to 18.4 mu g Cry1F cm(-2), and were not significantly different among locations. In 2018, LC50 estimates at Scottsbluff, NE (22.0 mu g Cry1F cm(-2)) and Watertown, NY (21.7 mu g Cry1F cm(-2)) were significantly higher when compared to locations in Michigan (15.8 mu g Cry1F cm(-2)). Significantly lower 14-day larval weight among survivors was correlated with higher Cry1F dose. Results from this study indicate that S. albicosta survivorship on purified Bt Cry1F toxin shows a relatively even distribution across the native and range expansion areas where seasonal field infestations typically occur.

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