The Poweshiek skipper disappeared from Iowa sometime around 2000-2005. Coincidental with that disappearance were two unusual events. One was massive outbreaks of soybean aphids, and the other was an irruption of massive quantities of a non-native lady beetle, Harmonia axyridis.
Both of these events are tied together–the beetles followed the aphids. And the aphids followed the clean beans.
The roused bear 
Huh? Can you elaborate? The turn of the century marks the rise of Round-up Ready soybeans, which did lead to clean beans. But why do clean beans allow aphids to erupt?