People who buy milkweed plants (most commonly Tropical milkweed [Asclepias curassavica]) from big box stores such as Lowes and Home Depot to feed monarch larvae frequently report that their larvae often die after feeding on the purchased plants. This is likely due to the plants being treated with topical or systemic insecticides. However, detailed information concerning the exact chemicals used and their potential impact on monarch larval mortality is poorly understood. This study sought to provide information on insecticides and larval mortality.
