Later today (Tues) the US Ag Department will issue the first field-based soybean crop estimate of the season. It's expected a decent year, although there are concerns about dry weather and insects Minnesota soybean producers are worried about damage from an emerging pest, the soybean aphid. The bug has spread rapidly since it was first found in the state three years ago. It's an economic concern for farmers. But it also demonstrates how organisms brought to the U.S. from overseas are forming new ecological communities. Mainstreet Radio's Mark Steil reports.