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Keep Western Monarchs Wild


Captive rearing poses the risk of transmitting disease between caterpillars raised in higher densities than they would occur in the wild using materials that may have accumulated parasites and pathogens. While disease and predation are natural parts of the monarch life cycle, it is possible to unintentionally infect multiple generations of caterpillars through the repeated use of rearing containers and materials. Infected individuals released into the wild may increase the incidence of disease in the wild population and cause lower survival and migration success.

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WAFWA monarch messaging fact sheet_keep western monarchs wildDownload
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  • Publication Date January 11, 2023
  • Update Date January 11, 2023
  • Download Count (since 10/2020) [31]