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<p>The emerald ash borer (<i>Agrilus planipennis</i>, EAB) poses an unprecedented threat to North American <i>Fraxinus</i> species and has already decimated ash populations in large parts of the natural range in the northeastern US. In some forest stands, a few trees remain alive with healthy crowns years after mortality from EAB has killed the majority of ash trees. These trees, called lingering ash, have been identified, replicated by grafting, and screened for resistance to EAB larvae in controlled greenhouse bioassays. This study showed that the proportion of larvae killed by tree defenses, and the average weight of EAB larvae within the tree differ between different tree genotypes, and that some lingering ash trees perform better than known susceptible trees for these traits. Clonal repeatibility was calculated to estimate broad sense heritability for each trait. Clonal repeatabilities for proportion of tree-killed larvae were 0.15 for green ash selections, 0.45 for white ash selections, and 0.87 for a single green ash family with lingering ash parentage. These results provide additional evidence that traits associated with EAB resistance in lingering ash have a genetic basis, the essential requirement for an EAB resistance breeding program.</p>

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Select genotypes of white and green ash show heritable, elevated resistance to emerald ash borer

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月14日

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  • Mary E. Mason,
  • Dave W. Carey,
  • Jeanne Romero-Severson,
  • Kathleen S. Knight,
  • Therese M. Poland,
  • Jennifer L. Koch

摘要

The emerald ash borer (Agrilus planipennis, EAB) poses an unprecedented threat to North American Fraxinus species and has already decimated ash populations in large parts of the natural range in the northeastern US. In some forest stands, a few trees remain alive with healthy crowns years after mortality from EAB has killed the majority of ash trees. These trees, called lingering ash, have been identified, replicated by grafting, and screened for resistance to EAB larvae in controlled greenhouse bioassays. This study showed that the proportion of larvae killed by tree defenses, and the average weight of EAB larvae within the tree differ between different tree genotypes, and that some lingering ash trees perform better than known susceptible trees for these traits. Clonal repeatibility was calculated to estimate broad sense heritability for each trait. Clonal repeatabilities for proportion of tree-killed larvae were 0.15 for green ash selections, 0.45 for white ash selections, and 0.87 for a single green ash family with lingering ash parentage. These results provide additional evidence that traits associated with EAB resistance in lingering ash have a genetic basis, the essential requirement for an EAB resistance breeding program.