In 2002, bean leaf beetle populations in Iowa reached their highest levels in 14 years (figure, left). In Iowa, this increase in beetle populations has been partly fueled by weather conditions that favor winter survival, such as mild temperatures (2001-2002: second mildest winter on record) or snow cover (2000-2001: snow cover for 99 consecutive days in central Iowa). The increase in beetle populations has followed the trend for warmer weather during the previous six winters (figure, right).
Iowa State University
Bradshaw, Jeffrey D. and Rice, Marlin E., "Bean leaf beetles: a current and historical perspective" (2003). Integrated Crop Management News. 1606.
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