Managing Halyomorpha halys: Effects of cold tolerance, insecticides, and linguistic uncertainty
2017-06
Loading...
View/Download File
Persistent link to this item
Statistics
View StatisticsJournal Title
Journal ISSN
Volume Title
Title
Managing Halyomorpha halys: Effects of cold tolerance, insecticides, and linguistic uncertainty
Authors
Published Date
2017-06
Publisher
Type
Thesis or Dissertation
Abstract
Managing pests effectively and efficiently requires knowledge about their biology. Likewise, clear communication about scientific research pertaining to management is needed for managers to make well-informed decisions. My research pertains to the biology of the brown marmorated stink bug, Halyomorpha halys and communication between scientists about insecticidal categorization. Halyomorpha halys is an exotic invasive species in North America. Many horticultural and agricultural plants in North America are at risk for economic damage due to the highly polyphagous nature of this species. Additionally, H. halys has become a serious nuisance pest in human-made structures in some areas when, in preparation for winter, they aggregate in sheltered structures. Therefore, factors such as cold and insecticides, which affect H. halys distribution and ability to cause crop injury are of particular interest to develop management plans. I first conducted several studies of cold tolerance on H. halys in North America. I found that H. halys exhibits a chill-intolerant cold tolerance strategy, that season, sex, and acclimation location affect cold tolerance (i.e., supercooling points), and that laboratory assays of lethal temperature were able to accurately forecast winter mortality in the field. Second, I studied H. halys diapause in more depth. I present a protocol for rearing diapausing H. halys in the laboratory that exhibit similar cold tolerance (i.e., supercooling points and lower lethal temperatures) as individuals with field-induced diapause. I found that H. halys diapause confers greater cold tolerance than a non-diapausing state, and appears to be necessary to survive overwintering. Additionally, I showed diapausing H. halys actively feed for at least three weeks post-diapause induction, but feeding is mediated by temperature and adult age. Third, I investigated and critiqued the current paradigm for determining insecticidal efficacy on H. halys. I highlighted important sublethal effects of insecticides on feeding that can significantly reduce crop injury without the necessity of high direct mortality to H. halys. Lastly, using an interdisciplinary lens I examined linguistic uncertainty as it pertains to categories and descriptors of insecticides. I demonstrated the presence and consequences of linguistically uncertain terms associated with insecticides and encouraged entomologists to more adequately acknowledge and address these uncertainties in future research.
Description
University of Minnesota Ph.D. dissertation. 2017. Major: Entomology. Advisor: William Hutchison. 1 computer file (PDF); 154 pages.
Related to
Replaces
License
Collections
Series/Report Number
Funding information
Isbn identifier
Doi identifier
Previously Published Citation
Suggested citation
Cira, Theresa. (2017). Managing Halyomorpha halys: Effects of cold tolerance, insecticides, and linguistic uncertainty. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/194627.
Content distributed via the University Digital Conservancy may be subject to additional license and use restrictions applied by the depositor. By using these files, users agree to the Terms of Use. Materials in the UDC may contain content that is disturbing and/or harmful. For more information, please see our statement on harmful content in digital repositories.