The April overall index for the Rural Mainstreet economy moved above growth neutral for the sixth straight month, indicating that the agriculturally dependent areas of the region continue to expand at a healthy pace. A significant downturn in farm commodity prices could threaten the rural economy, according to this month’s survey of bank CEOs in a 10-state region. Approximately 48 percent indicated that a downturn in farm commodity prices is the largest single threat to the rural economy. Thirty-nine percent said high energy prices are the most significant challenge. In Iowa, the Rural Mainstreet Index rose to 60 in April from 57.3 in March.