Bt maize can provide non-chemical pest control and enhance food safety in China

文献类型： 外文期刊

第一作者： Yang, Xianming

作者： Yang, Xianming;Zhao, Shengyuan;Liu, Bing;Gao, Yu;Liu, Dazhong;Shen, Xiujing;Wyckhuys, Kris A. G.;Lu, Yanhui;Wu, Kongming;Hu, Chaoxing;Li, Wenjing;Yang, Yizhong;Li, Guoping;Wang, Lili;Yang, Xueqing;Yuan, Haibin;Liu, Jian;Liu, Dazhong;Wyckhuys, Kris A. G.;Wyckhuys, Kris A. G.;Wyckhuys, Kris A. G.

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关键词： Bt maize; lepidopteran pest pressure; seed mixtures; block refuge; crop yield; mycotoxin contamination

期刊名称：PLANT BIOTECHNOLOGY JOURNAL （ 影响因子：13.263； 五年影响因子：11.619 ）

ISSN： 1467-7644

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收录情况： SCI

摘要： China is the world's second-largest maize producer and consumer. In recent years, the invasive fall armyworm Spodoptera frugiperda (J.E. Smith) has adversely affected maize productivity and compromised food security. To mitigate pest-inflicted food shortages, China's Government issued biosafety certificates for two genetically modified (GM) Bt maize hybrids, Bt-Cry1Ab DBN9936 and Bt-Cry1Ab/Cry2Aj Ruifeng 125, in 2019. Here, we quantitatively assess the impact of both Bt maize hybrids on pest feeding damage, crop yield and food safety throughout China's maize belt. Without a need to resort to synthetic insecticides, Bt maize could mitigate lepidopteran pest pressure by 61.9-97.3%, avoid yield loss by 16.4-21.3% (range -11.9-99.2%) and lower mycotoxin contamination by 85.5-95.5% as compared to the prevailing non-Bt hybrids. Yield loss avoidance varied considerably between experimental sites and years, as mediated by on-site infestation pressure and pest identity. For either seed mixtures or block refuge arrangements, pest pressure was kept below established thresholds at 90% Bt maize coverage in Yunnan (where S. frugiperda was the dominant species) and 70% Bt maize coverage in other sites dominated by Helicoverpa armigera (Hubner) and Ostrinia furnacalis (Guenee). Drawing on experiences from other crop/pest systems, Bt maize in se can provide area-wide pest management and thus, contribute to a progressive phase-down of chemical pesticide use. Hence, when consciously paired with agroecological and biodiversity-based measures, GM insecticidal crops can ensure food and nutrition security, contribute to the sustainable intensification of China's agriculture and reduce food systems' environmental footprint.

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