Incidence of <i>Alfalfa mosaic virus</i>, <i>Bean pod mottle virus</i>, and <i>Soybean mosaic virus</i> in Nebraska Soybean Fields

Fig. 4. Distribution of soybean fields with Soybean mosaic virus-infected plants in 2002. Blue shaded counties denote sampled counties with numbers in each county representing [No. positive fields : No. fields tested].

Image from Plant Health Progress article:
Incidence of Alfalfa mosaic virus, Bean pod mottle virus, and Soybean mosaic virus in Nebraska Soybean Fields