Survival at days 7, 14, and 21 of two species of larval butterflies that were free-ranging on host plants that were untreated (C), treated with label rate (1X), or twice label rate (2X) of soil-applied imidacloprid (Marathon 1%G).

<p><i>Danaus</i>, monarch butterflies were fed Mexican milkweed, <i>Asclepias curassavica</i>, and <i>Vanessa</i> painted lady butterflies were fed globe thistle, <i>Echinops ritro</i>.