Clean Beans and the Poweshiek Skipper

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.

2-4-12009

Both of these events are tied together–the beetles followed the aphids.  And the aphids followed the clean beans.

About the roused bear

Nature photographer from central Iowa.
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1 Response to Clean Beans and the Poweshiek Skipper

  1. Jerry says:

    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?

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