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Assessing different insecticides for potential use as a toxic standard in pesticide risk assessment protocols with Bombus impatiens (Cresson)

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Title: Assessing different insecticides for potential use as a toxic standard in pesticide risk assessment protocols with Bombus impatiens (Cresson)
Author: Celetti, Tara
Department: School of Environmental Sciences
Program: Environmental Sciences
Advisor: Scott-Dupree, CynthiaCutler, Chris
Abstract: Bumble bees (Bombus spp.) are important pollinators in natural and agricultural landscapes. Bumble bees can be exposed to pesticides via spray deposition, contact with plant surfaces, or ingestion of contaminated nectar. Therefore, there is a need to develop pesticide risk assessment protocols for bumble bees. Recently, laboratory protocols were established using Bombus impatiens (Cresson) (the North American surrogate bumble bee), but tier II semi-field methods still need to be refined and validated. In this thesis, I determined the contact and oral median lethal dose (LD50) for dimethoate on B. impatiens which has not been previously reported. Secondly, I investigated the effects of dimethoate and three insect growth regulators (IGRs) to determine their suitability as toxic standards for use in semi-field pesticide risk assessment. I found that none of the IGRs caused adverse effects on B. impatiens reproduction, but dimethoate was highly toxic to B. impatiens under semi-field and laboratory conditions.
URI: http://hdl.handle.net/10214/13060
Date: 2018-05
Rights: Attribution-ShareAlike 2.5 Canada


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Attribution-ShareAlike 2.5 Canada Except where otherwise noted, this item's license is described as Attribution-ShareAlike 2.5 Canada