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Effects of Coragen®, a ryanoid insecticide, applied topically to two crop-representative spiders, Enoplognatha ovata (Araneae: Theridiidae) and Tibellus spp. (Araneae: Philodromidae)

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Title: Effects of Coragen®, a ryanoid insecticide, applied topically to two crop-representative spiders, Enoplognatha ovata (Araneae: Theridiidae) and Tibellus spp. (Araneae: Philodromidae)
Author: Tomascik, Michael
Department: Department of Environmental Biology
Program: Environmental Sciences
Advisor: Schmidt, Jonathan
Abstract: The role of spiders as natural enemies can be compromised by their susceptibility to broad-spectrum insecticides. To date the toxic effects of Coragen® (a.i. Chlorantraniliprole) (DuPont Canada), a recently introduced ryanoid insecticide, have not been investigated in spiders. In this thesis, the direct lethal and sublethal effects of Coragen® applied topically to Enoplognatha ovata, and Tibellus spp., were determined. Coragen® applied at concentrations of 1.125 mg mL-1 (corresponding to the manufacturer recommended tank concentrations of 0.5 to 1.0 mg mL-1) caused mortality in >50% of the spiders tested. In arena tests sublethal concentrations did not affect the rate at which spiders killed Drosophila. The toxicity of Coragen® was enhanced by co-application of piperonyl butoxide (PBO). These results suggest that differences between the ryanodine receptors of target pests and spiders are insufficient to result in selective toxicity and metabolic detoxification of Coragen® by spiders depends on oxidative and/or hydrolytic enzymes.
URI: http://hdl.handle.net/10214/9260
Date: 2015
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