| Summary: | Degree: Master of Science Abstract: Wheat midge, Sitodiplosis mosellana Géhin (Diptera: Cecidomyiidae), is an invasive pest of wheat that has spread into the Peace River region of Alberta, Canada. The biology and monitoring of wheat midge has not previously been examined in this region. Wheat midge overwintering density and parasitism rates were examined by rearing field collected soil, and overwintering mortality was determined by rearing wheat midge in soil in different conditions. Parasitism rates were high (>50%). Rates of adult emergence were higher when soil was held under controlled conditions overwinter. Patterns of adult wheat midge emergence in the field were compared to published bioclimatic models. The differences between adult emergence in the Peace River region were great enough that development of a regionally-optimized model is necessary. In the Peace River region, adults emerged 300 GDD base 7 °C after a rainfall event. Multiple peaks of wheat midge emergence and capture on pheromone-baited traps were observed. Capture of adult wheat midges on different delta traps (orange or green), and pheromone lures (Scotts™ flex, Scotts™ septa, or Great Lakes IPM™ septa) were compared. In 2017, delta traps with a larger surface area captured more midges, and traps baited with the Scotts™ flex lure captured more midges than the Great Lakes IPM™ septa lure. Different un-baited yellow sticky cards (Great Lakes IPM™, Alpha Scents™, or Alpha Scents™ rolled into a cylinder) were compared for wheat midge capture. More midges were captured on the smaller, Great Lakes IPM™ unbaited yellow sticky cards than the two, larger Alpha Scents™ cards. We examined relationships between capture of adult midges on pheromone or yellow sticky card traps to larval density by extracting larvae from wheat heads at the same sites. We found no relationships between pheromone-baited traps and larval densities and were unable to determine relationships between yellow sticky cards and larval densities. To compare harvest metrics to ...
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