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The State of the Butterflies in the United States project demonstrated that butterfly populations across the US are dramatically declining — they fell by more than 20% between the year 2000 and 2020. There are multiple causes, but one of them is the loss of caterpillar host plants. Getting more host plants into our neighborhoods and parks is essential — but what happens if those plants are contaminated by pesticides and they are toxic to the caterpillars that need them?

To talk more about this conundrum is Aaron Anderson. Aaron is no stranger to Bug Banter listeners. Aaron is a member of Xerces’ pesticide reduction team, where his work focuses on reducing pesticide use in residential landscapes, including promoting alternative pest-control measures and pollinator-friendly gardening practices. More pertinently, he recently was a coauthor on a study of pesticide contamination of butterfly host plants.

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Photo Credit: Kevin Burls

Thank you for listening! For more information go to xerces.org/bugbanter.

Hidden in Plain Sight: Pesticide Contamination in Butterfly Host Plants