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首页> 美国卫生研究院文献>Journal of Economic Entomology >Field Trial Performance of Herculex XTRA (Cry34Ab1/Cry35Ab1) and SmartStax (Cry34Ab1/Cry35Ab1 + Cry3Bb1) Hybrids and Soil Insecticides Against Western and Northern Corn Rootworms (Coleoptera: Chrysomelidae)
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Field Trial Performance of Herculex XTRA (Cry34Ab1/Cry35Ab1) and SmartStax (Cry34Ab1/Cry35Ab1 + Cry3Bb1) Hybrids and Soil Insecticides Against Western and Northern Corn Rootworms (Coleoptera: Chrysomelidae)

机译：Herculex XTRA（Cry34Ab1 / Cry35Ab1）和SmartStax（Cry34Ab1 / Cry35Ab1 + Cry3Bb1）杂种和土壤杀虫剂对西部和北部玉米根虫（鞘翅目：金眼科）的田间试验性能

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Western corn rootworm, Diabrotica virgifera virgifera LeConte (Coleoptera: Chrysomelidae), and northern corn rootworm, Diabrotica barberi Smith and Lawrence (Coleoptera: Chrysomelidae), are important insect pests in corn, Zea mays L. For more than a decade, growers have been using transgenic plants expressing proteins from the bacterium Bacillus thuringiensis (Bt) to protect corn roots from feeding. In 2011, western corn rootworm populations were reported to have developed resistance to Bt hybrids expressing Cry3Bb1 and later found to be cross-resistant to hybrids expressing mCry3A and eCry3.1Ab. The identification of resistance to Cry3 (Cry3Bb1, mCry3A, and eCry3.1Ab) hybrids led to concerns about durability and efficacy of products with single traits and of products containing a pyramid of a Cry3 protein and the binary Bt proteins Cry34Ab1 and Cry35Ab1. From 2012 to 2014, 43 field trials were conducted across the central United States to estimate root protection provided by plants expressing Cry34Ab1/Cry35Ab1 alone (Herculex RW) or pyramided with Cry3Bb1 (SmartStax). These technologies were evaluated with and without soil-applied insecticides to determine if additional management measures provided benefit where Cry3 performance was reduced. Trials were categorized for analysis based on rootworm damage levels on Cry3-expressing hybrids and rootworm feeding pressure within each trial. Across scenarios, Cry34Ab1/Cry35Ab1 hybrids provided excellent root protection. Pyramided traits provided greater root and yield protection than non-Bt plus a soil-applied insecticide, and only in trials where larval feeding pressure exceeded two nodes of damage did Cry34Ab1/Cry35Ab1 single-trait hybrids and pyramided hybrids show greater root protection from the addition of soil-applied insecticides.
机译：西部玉米根虫Diabrotica virgifera virgifera LeConte（鞘翅目：菊科）和北部玉米根虫Diabrotica barberi Smith和Lawrence（鞘翅目：菊科）是玉米Zea mays L中玉米的重要害虫。十多年来，种植者一直使用表达苏云金芽孢杆菌（Bt）细菌蛋白的转基因植物来保护玉米根免于摄食。 2011年，据报道西部玉米根虫种群对表达Cry3Bb1的Bt杂种产生了抗性，后来发现对表达mCry3A和eCry3.1Ab的杂种具有交叉抗性。对Cry3（Cry3Bb1，mCry3A和eCry3.1Ab）杂种的抗性鉴定导致人们对具有单一性状的产品以及含有Cry3蛋白和二元Bt蛋白Cry34Ab1和Cry35Ab1金字塔的产品的耐久性和功效产生了担忧。从2012年到2014年，在美国中部进行了43次田间试验，以评估仅表达Cry34Ab1 / Cry35Ab1（Herculex RW）或与Cry3Bb1成金字塔形的植物提供的根保护作用（SmartStax）。在有和没有土壤杀虫剂的情况下，对这些技术进行了评估，以确定在降低Cry3性能的地方是否采取了其他管理措施。根据在每个试验中表达Cry3的杂种上的根虫危害水平和根虫摄食压力，对试验进行了分类分析。在各种情况下，Cry34Ab1 / Cry35Ab1杂种均提供了出色的根保护。与非Bt加土壤杀虫剂相比，酰胺酰胺性状提供了更好的根系和产量保护，只有在幼虫摄食压力超过两个损害节点的试验中，Cry34Ab1 / Cry35Ab1单性状杂种和金字塔状杂种才显示出更大的根系保护作用在土壤中使用的杀虫剂。

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