Browsing by Author "Wittman, Jacob T"
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Item Checklist of Minnesota Buprestidae Appendix: Distributional Maps(2020-04-08) Hallinen, Marie J; Wittman, Jacob T; Steffens, Wayne P; Schultz, Jennifer L; Aukema, Brian H; MarieHallinen@gmail.com; Hallinen, Marie J; University of Minnesota Forest Entomology LabWe utilized a biosurveillance sampling method, namely the use of the native ground-nesting hunting wasp Cerceris fumipennis, along with University of Minnesota Insect Collection (UMSP) records, to create a checklist for Buprestidae in Minnesota, USA. We examined 5,127 specimens with Minnesota localities, documenting 107 species. Of these, 37 new state records are noted, including 11 collected from C. fumipennis nesting sites between 2013 and 2018. Maps displaying the number of beetles for a given species caught in each county and the time passed since last collection (within 20 years) are provided here as an appendix.Item Data and code for "Optimizing early detection strategies: defining the effective attraction radius of attractants for emerald ash borer"(2021-04-30) Wittman, Jacob T; Silk, Peter; Parker, Katie; Aukema, Brian H; wittm094@umn.edu; Wittman, Jacob TFrom the publication: 1. Adult emerald ash borers are attracted to green prism traps baited with the ash host volatile (3Z)-hexenol and the sex pheromone of emerald ash borer (3Z)-dodecen-12-olide [(3Z)-lactone]. Quantifying the heretofore unknown range of attraction of such traps would help optimize deployment strategies for early detection. 2. Examining trap captures of traps deployed in pairs at variable distances offers insight into the range of attraction. Recent work has shown the range of attraction can be estimated as half the intertrap distance at which trap catch begins to decrease, which should occur when proximate traps overlap their respective attractive ranges. 3. We illustrate estimation of the traps' attractive range for emerald ash borer using ninety-eight baited green prism traps deployed in pairs, one trap per tree, in an urban park in Saint Paul, Minnesota, USA in summer 2020. 4. We estimate attractive range by fitting a logistic model to trap catch data using Bayesian inferential methods and describe advantages thereof. 5. The attractive range of these baited traps was estimated to be between 16 -- 73m, with a median of 28m. We recommend that green prism traps baited with these semiochemicals be placed 25 - 35m apart near high-risk entry points.Item Data and code for forecasting overwintering mortality of Spathius galinae in North America(2021-04-26) Wittman, Jacob T; Aukema, Brian H; Duan, Jian J; Venette, Robert C; wittm094@@umn.edu; Wittman, Jacob TFrom publication: Evaluating the cold tolerance of biological control agents is often necessary to optimize their release and performance. We used field and laboratory assays to determine the cold hardiness of the parasitoid Spathius galinae Belokobylskij & Strazanac, an approved classical biological control agent of emerald ash borer (Agrilus planipennis Fairmaire) in North America. Supercooling points and lower lethal temperature of mature (cocooned) S. galinae larvae were measured in controlled cooling assays in the laboratory. Most S. galinae larvae died after reaching their supercooling point, which occurred at -25.0°C on average. Several larvae, however, initiated freezing but later eclosed, suggesting S. galinae may be partially freeze tolerant. Supercooling points were not affected by chilling rate. In the winter of 2019 – 2020, we monitored development of mature S. galinae larvae in ash segments above and beneath the snow in three locations in Minnesota, USA. Nearly 100% of S. galinae larvae died after air temperatures reached -29°C in Minnesota. Using models developed from our data, we forecast eclosion rates of S. galinae based on minimum winter temperatures across the range of ash (Fraxinus spp.) in North America. Our results indicate that S. galinae populations may suffer high overwintering mortality in areas where winter temperatures regularly decrease below -28°C, but a small portion of the population may be able to survive lower temperatures.Item The Jewel Beetles of Minnesota(2021-03) Hallinen, Marie J; Steffens, Wayne P; Schultz, Jennifer L; Wittman, Jacob T; Aukema, Brian HA photo guide to the jewel beetles (Coleoptera: Buprestidae) of Minnesota, including beetle distribution by county, host information, and notes on biology. This guide is based on specimens housed in the University of Minnesota Insect Collection (UMSP), including buprestids collected from Cerceris fumipennis nest monitoring from 2014 to 2018.