Abstract
The emerald ash borer (EAB; Agrilus planipennis Fairmaire) is a bark and wood boring beetle native to east Asia that was first discovered in North America in 2002. Since then, entire stands of highly susceptible green ash (Fraxinus pennsylvanica Marshall) have been killed within a few years of infestation. We have identified a small number of mature green ash trees which have been attacked by EAB, yet survived the peak EAB infestation that resulted in mortality of the rest of the ash cohort. Adult landing and feeding preference bioassays, leaf volatile quantification and EAB egg bioassay experiments were used to characterize potential differences in responses of these select “lingering” green ash trees relative to known EAB susceptible controls. Three selections were identified as being significantly less preferred for adult feeding, but no specific leaf volatile profile was associated with this reduced preference. Egg bioassays identified two ash selections that had significant differences in larval survival and development; one having a higher number of larvae killed by apparent host tree defenses and the other having lower larval weight. Correlation and validation of the bioassay results in replicated plantings to assess EAB resistance in the field is still necessary. However, the differences between lingering ash selections and susceptible controls measured by these bioassays indicate that more than one mechanism is responsible for the increased resistance to EAB that resulted in these selections surviving longer than their counterparts. Efforts to further increase ash resistance to EAB through use of these selections in a breeding program are underway.
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Acknowledgments
The authors would like to thank Debbie Miller and Tina Ciaramataro for assistance in rearing EAB eggs and the performance of adult landing and feeding bioassays, Rachel Kappler for assisting with scion collections and field data collection, Ryan Matko and Mark Miller for assistance in plant rearing and egg bioassays and the many summer seasonal employees of the USDA Forest Service Northern Research Station, the Ohio State University, and Metroparks of the Toledo area who assisted with field data collection. We are grateful to Dr. Daniel A. Herms for sharing data from his monitoring plots in southeastern Michigan and to Diane Hartzler for help with compilation of that data. We also thank Dr. Margaret Staton and Dr. Jeanne Romero-Severson as well as two anonymous reviewers for their helpful comments on an earlier draft of the manuscript. This work was funded by the USDA Forest Service Northern Research Station, the USDA APHIS Accelerated Emerald Ash Borer Research Program and by the Toledo Metroparks through a Grant from the American Recovery and Reinvestment Act (ARRA).
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Figure S1
Examples of host defense killed larvae in two EAB-resistant Asian Fraxinus species, F. mandshurica (Manchurian ash) and F. chinensis (Chinese ash) compared to host defense killed larvae in the EAB-susceptible North American species F. pennsylvanica (green ash). (JPEG 167 kb)
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Koch, J.L., Carey, D.W., Mason, M.E. et al. Intraspecific variation in Fraxinus pennsylvanica responses to emerald ash borer (Agrilus planipennis). New Forests 46, 995–1011 (2015). https://doi.org/10.1007/s11056-015-9494-4
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DOI: https://doi.org/10.1007/s11056-015-9494-4