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Thesis MS - Radl, James.pdf (4.38 MB)

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Field and Bioassay Evaluations of Elm Flea Weevil (Orchestes steppensis Korotyaev) Adult Feeding Preference and Larval Mine Presence among New American (Ulmus americana) and Hybrid Elm (Ulmus spp.) Cultivars

Radl, James
http://orcid.org/0000-0001-6387-3894
http://rave.ohiolink.edu/etdc/view?acc_num=osu153191097403527

Abstract Details

2018, Master of Science, Ohio State University, Entomology.
Twelve cultivars of commercially available elms (mostly hybrids) from the National Elm Trial and five cultivars of American elms from the USDA Forest Service Northern Research Station were evaluated for both adult and larval feeding damage by the elm flea weevil, Orchestes steppensis (Coleoptera: Curculionidae). O. steppensis is a recent invasive species in North America that damages elm trees by disfiguring leaves with adult pit feeding and larval mining. A summary of the history, biology, and importance of this pest is included as well as some personal observations of populations in Columbus, Ohio. Trials were repeated using several different variables including: location/type of cultivar, type of evaluation (field choice test and bioassay no-choice test), time of year (for field evaluations only), and life stage (adult feeding and larval mines/oviposition). Generally, the results show that adult O. steppensis have a significant preference for certain cultivars over others. Some of the least preferred cultivars by the adult weevils included `Accolade,’ `Clone D,’ `Commendation,’ `Danada Charm,’ `Patriot,’ and `Triumph.’ Only one American elm was used in the trials comparing different commercially available cultivars (`Valley Forge’), and it was among the least preferred during the field evaluations but, unexpectedly, one of the most preferred during the bioassay. No preference was detected among different cultivars of the American elm, however, these were also minimally fed upon in the field evaluations and heavily fed upon in the bioassays. The field evaluations of the larval mines showed that some commercially available cultivars may have more mines, but this is not consistent throughout the season. The adult preference does not appear to be correlated with larval preference. The oviposition bioassay was inconclusive. Evaluations throughout the year show that adult feeding damage increases between May (after the overwintered population has fed) and June (after the newly emerged population has fed). The weevils’ preference rank among cultivars does not appear to change throughout the year, but the later population seems to show a stronger preference for the preferred cultivars than the original population. The results of these evaluations provide growers with information on which elm cultivars are non-preferred or resistant to O. steppensis feeding, and, therefore, which cultivars would require the least amount of insecticide treatment to keep their leaves healthy.
David Shetlar (Advisor)
125 p.
Entomology
elm flea weevil; National Elm Trial; elm hybrid; American elm

Recommended Citations

Citations

  • Radl, J. (2018). Field and Bioassay Evaluations of Elm Flea Weevil (Orchestes steppensis Korotyaev) Adult Feeding Preference and Larval Mine Presence among New American (Ulmus americana) and Hybrid Elm (Ulmus spp.) Cultivars [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu153191097403527

    APA Style (7th edition)

  • Radl, James. Field and Bioassay Evaluations of Elm Flea Weevil (Orchestes steppensis Korotyaev) Adult Feeding Preference and Larval Mine Presence among New American (Ulmus americana) and Hybrid Elm (Ulmus spp.) Cultivars. 2018. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu153191097403527.

    MLA Style (8th edition)

  • Radl, James. "Field and Bioassay Evaluations of Elm Flea Weevil (Orchestes steppensis Korotyaev) Adult Feeding Preference and Larval Mine Presence among New American (Ulmus americana) and Hybrid Elm (Ulmus spp.) Cultivars." Master's thesis, Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu153191097403527

    Chicago Manual of Style (17th edition)

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This open access ETD is published by The Ohio State University and OhioLINK.