Wisconsin is the leading producer of succulent beans in the United States with 79,800 acres in production creating a fresh market and processing industry valued at 36 million dollars/year (Wisconsin Ag Statistics, 2003). Virus problems in the Midwest continue to seriously affect the financial viability of this industry. A virus complex involving cucumber mosaic virus (CMV) alfalfa mosaic virus (AMV) and perhaps others first appeared in 2000 in production fields in eastern and south-central Wisconsin causing significant losses. In 2001 losses were less but the presence of virus symptoms was noted in these same growing areas. Losses in 2002 were minimal and appeared to relate to reduced populations and delayed appearance of the soybean aphid. During the 2003 growing season, losses were widespread in Wisconsin and in southern Minnesota, western and southeastern Michigan, and parts of New York State.