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The Colorado potato beetle (CPB),  Leptinotarsa decemlineata  (Say), is an agricultural pest of solanaceous crops which has developed insecticide resistance at an alarming rate. Up to this point, little consideration has been given to unintended, or inadvertent effects that non-insecticide xenobiotics may have on insecticide susceptibility in  L .  decemlineata . Fungicides, such as chlorothalonil and boscalid, are often used to control fungal pathogens in potato fields and are applied at regular intervals when  L .  decemlineata  populations are present in the crop. In order to determine whether fungicide use may be associated with elevated levels of insecticide resistance in  L .  decemlineata , we examined phenotypic responses in  L .  decemlineata  to the fungicides chlorothalonil and boscalid. Using enzymatic and transcript abundance investigations, we also examined modes of molecular detoxification in response to both insecticide (imidacloprid) and fungicide (boscalid and chlorothalonil) application to more specifically determine if fungicides and insecticides induce similar metabolic detoxification mechanisms. Both chlorothalonil and boscalid exposure induced a phenotypic, enzymatic and transcript response in  L .  decemlineata  which correlates with known mechanisms of insecticide resistance.

scientific reports

Agricultural fungicides inadvertently influence the fitness of Colorado potato beetles, Leptinotarsa decemlineata, and their susceptibility to insecticides