Graduate Thesis Or Dissertation

 

The Impact of Temperature on Halyomorpha halys (Hemiptera: Pentatomidae) Life Table Parameters and Feeding Pressure Public Deposited

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/pr76f567d

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  • Halyomorpha halys (Stål) (Hemiptera: Pentatomidae) is an invasive insect pest that has become established and problematic in the Pacific Northwest. Known colloquially as the brown marmorated stink bug (BMSB), H. halys causes direct damage through feeding activity on a wide range of agronomic and horticultural crops. The objectives of this research were: 1) to establish ovipositional and survival thresholds of H. halys; and 2) to determine the impact of life stage and temperature on feeding activity using wine grapes as a model host plant. In the first study, cohorts of H. halys were exposed to seven constant temperatures, from 15 to 32°C, in growth chambers to determine longevity and fecundity. The lower and upper temperature thresholds for reproduction was 18 and 32°C, respectively. As temperatures increased, survival of adult females decreased. Highest rates of oviposition occurred at 25°C, followed in order by 27, 22, 32 and 18°C. Pre-ovipositional periods were shortest at 30°C at 7 days, while ovipositional periods were longest at 22°C at 113 days, with highest mean oviposition at 25°C at 1.43 ± 0.21 eggs per female per day. Mean female longevity was highest at 18°C at 76.1 days. In the second study, the impact of life stage and temperature on H. halys feeding was determined on wine grapes for four weeks during pre-véraison to determine the relative feeding activity. Both temperature and life stage had a significant effect on feeding activity in wine grapes. The mean number of stylet sheaths, an indicator of feeding activity, was highest at 1.226 ± 0.282 stylet sheaths per berry in sunny regimes containing adults and lowest at 0.028 ± 0.012 stylet sheaths per berry in shady regimes containing eggs. Average cluster and berry weight, diameter and number of berries per cluster were not significantly different between temperature regimes. The results from these studies demonstrates the relative importance of the environment as indicated by accumulated degree-days and life stage on feeding activity. Feeding activity was higher in older life stages and increased with the accumulation of degree days. The data can be incorporated into control and management strategies, as well as in prediction and risk models.
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  • description.provenance : Made available in DSpace on 2016-09-27T18:05:47Z (GMT). No. of bitstreams: 2 license_rdf: 1223 bytes, checksum: d127a3413712d6c6e962d5d436c463fc (MD5) MaslenErikaA2016.pdf: 968901 bytes, checksum: 4d11392c2168fa0dce24a2f63d76e8d0 (MD5) Previous issue date: 2016-08-10
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