Honors College Thesis
 

Insights into the Host Range, Population Decline, and Pathogenicity to Potato of Globodera ellingtonae

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https://ir.library.oregonstate.edu/concern/honors_college_theses/fj2367582

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  • This thesis project has the following specific objectives: (i) Determine pathogenicity of Globodera ellingtonae to potato utilizing two trials conducted over a 16 week period, (ii) Elucidate the host range of G. ellingtonae using a variety of different Solanum weed species and crop species, and (iii) Characterize population decline of G. ellingtonae under field conditions at Powell Butte, Oregon over an 18 month period. Data collected is intended to be used to encourage, as warranted based on the data, the application of quarantine measures for G. ellingtonae within the U.S. or to provide more robust support of the effectiveness of the existing management plan. In the pathogenicity study, G. ellingtonae caused minimal or no impact to the yield of potato compared to impacts reported in the literature for G. pallida and G. rostochiensis. The host range of G. ellingtonae was determined to be restricted to plants within the Solanaceae family. Lastly, reductions in population densities of G. ellingtonae were observed in areas with higher initial populations of G. ellingtonae while areas with lower initial densities showed little to no reduction. The findings of this thesis project furthered the understanding of the pathogenicity to potato, the host range, and population decline of Globodera ellingtonae. The minimal impact of G. ellingtonae on the growth and yield of potato observed in this study is in contrast to what have been observed for the quarantine nematodes G. pallida and G. rostochiensis, a result which warrants additional research under different environmental conditions. The existing knowledge of the host range of G. ellingtonae was expanded to include more members of the Solanaceae family, demonstrating further similarities and differences between G. ellingtonae, G. pallida, and G. rostochiensis. The population decline data supports a need for improved characterization of the population decline of G. ellingtonae over longer periods. Key Words: Pathogenicity, Globodera ellingtonae, Potato Cyst, Nematode, Host Range, Population Decline
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