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首页> 外文期刊>Journal of Economic Entomology >Effects of Pyramided Bt Corn and Blended Refuges on Western Corn Rootworm and Northern Corn Rootworm (Coleoptera: Chrysomelidae)
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Effects of Pyramided Bt Corn and Blended Refuges on Western Corn Rootworm and Northern Corn Rootworm (Coleoptera: Chrysomelidae)

机译：酰胺化的Bt玉米和混合避难所对西部玉米根虫和北部玉米根虫的影响（鞘翅目：金眼科）

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摘要

The western corn rootworm, Diabrotica virgifera virgifera LeConte, and the northern corn rootworm, Diabrotica barberi Smith & Lawrence (Coleoptera: Chrysomelidae), are major pests of corn (Zea mays L). Several transgenic corn events producing insecticidal toxins derived from the bacterium Bacillus thuringiensis (Bt) kill corn rootworm larvae and reduce injury to corn roots. However, planting of Bt corn imposes selection on rootworm populations to evolve Bt resistance. The refuge strategy and pyramiding of multiple Bt toxins can delay resistance to Bt crops. In this study, we assessed the impact of four treatments-1) non-Bt corn, 2) Cry3Bb1 corn, 3) corn pyramided with Cry3Bb1 and Cry34/35Ab1, and 4) pyramided corn with a blended refuge-on survival, time of adult emergence, and size of western and northern corn rootworm. All treatments with Bt corn led to significant reductions in the number of adults that emerged per plot. However, at one location, we identified Cry3Bb1-resistant western corn rootworm. In some cases Bt treatments reduced size of adults and delayed time of adult emergence, with effects most pronounced for pyramided corn. For both species, the number of adults that emerged from pyramided corn with a blended refuge was significantly lower than expected, based solely on emergence from pure stands of pyramided corn and non-Bt corn. The results of this study indicate that pyramided corn with a blended refuge substantially reduces survival of both western and northern corn rootworm, and as such, should be a useful tool within the context of a broader integrated pest management strategy.
机译：西部玉米根虫Diabrotica virgifera virgifera LeConte和北部玉米根虫Diabrotica barberi Smith＆Lawrence（鞘翅目：金眼科）是玉米的主要害虫（Zea mays L）。数种转基因玉米事件产生了源自苏云金芽孢杆菌（Bt）细菌的杀虫毒素，可杀死玉米根虫幼虫并减少对玉米根的伤害。但是，种植Bt玉米对根虫种群施加选择以发展Bt抗性。避难所策略和多种Bt毒素的金字塔化可以延迟对Bt作物的抗性。在这项研究中，我们评估了四种处理方法的影响-1）非Bt玉米，2）Cry3Bb1玉米，3）与Cry3Bb1和Cry34 / 35Ab1金字塔形的玉米，以及4）具有混合避难所存活时间的金字塔形玉米成虫的出现，和西部和北部玉米根虫的大小有关。用Bt玉米进行的所有处理均导致每个地块中出现的成虫数量大大减少。但是，在一个位置，我们确定了抗Cry3Bb1的西方玉米根虫。在某些情况下，Bt处理可减少成虫的体形并延迟成虫的出现时间，其中金字塔形玉米的效果最为明显。对于这两个物种，仅基于金字塔形玉米和非Bt玉米纯种的出苗率，从带有混合避难所的金字塔形玉米中出来的成年数量明显低于预期。这项研究的结果表明，带有混合避难所的金字塔形玉米大大降低了西部和北部玉米根虫的存活率，因此，在更广泛的病虫害综合防治策略中，它应该是一种有用的工具。

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