数字农科院2.0

Efficacy of Bt-(Cry1Ab + Cry2Ab + Cry1Fa) maize against Spodoptera frugiperda and other lepidopteran migratory pests in tropical Asia

文献类型： 外文期刊

作者： Shuang Chen;Xianming Yang;Guodong Kang;Haitao Li;Cheng Song;Liping Qi;Na Li;Zhenwei Tian;Dazhong Liu;Kongming Wu

关键词： Bt-(Cry1Ab + Cry2Ab + Cry1Fa) maize; Bt insecticidal protein; lepidopteran pests; bioassay; field trial; control efficacy

期刊名称： PEST MANAGEMENT SCIENCE

ISSN： 1526-498X

年卷期： 2025 年

页码：

收录情况： SCIE（2025版）

摘要： BACKGROUND The invasive fall armyworm Spodoptera frugiperda and other lepidopteran migratory pests significantly threaten maize production in tropical Asia, a key year-round breeding region and source of spring or summer migrants across the broader Asian region. The strategic deployment of genetically modified maize expressing pyramided Bacillus thuringiensis (Bt) toxins offers a promising approach for managing multiple pests and delaying resistance evolution in this region. This study evaluated the insecticidal efficacy of Bt maize (LP026-2 event, Cry1Ab + Cry2Ab + Cry1Fa) against six major lepidopteran pests: S. frugiperda, Mythimna separata, Spodoptera exigua, Spodoptera litura, Helicoverpa armigera, and Ostrinia furnacalis. RESULTS Total Bt protein levels in Bt-(Cry1Ab + Cry2Ab + Cry1Fa) maize followed the order: leaf > silk > kernel, with Cry2Ab as the dominant toxin, comprising 84.49% (188.75 μg g−1) in leaves and 64.12% (16.12 μg g−1) in kernels. Bioassays demonstrated its high efficacy, with corrected mortality >90% against all six pests in leaf and kernel assays after 5 days. Pest susceptibility ranked as H. armigera > S. frugiperda > O. furnacalis > M. separata > S. exigua > S. litura, with efficacy highest in leaf, followed by kernel and silk tissues (silk mortality 69.15–98.94%). Field trials further validated the efficacy of Bt maize, showing significant reduction in larval densities, plant damage, along with 4.52–25.41% yield increase over the non-Bt maize. CONCLUSION These findings demonstrate that Bt-(Cry1Ab + Cry2Ab + Cry1Fa) maize provides effective multi-pest control and yield benefits, supporting its integration into the migratory pest management strategies for tropical maize production systems. © 2025 Society of Chemical Industry.

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