Figure 5: Mean colony-forming units per gram of dry soil for Fusarium virguliforme isolated from soil samples collected in 2008 and 2009 (A) from Waterloo, Black Hawk County, IA, wherein the field was planted with soybean in 2007 followed by winter wheat, corn in 2008, and soybean in 2009; (B) from two fields in Manchester, Delaware County, IA, wherein field 1 had soybean in 2007, corn in 2008, and soybean in 2009 and in field 2, corn in 2007, soybean in 2008, and corn in 2009; and (C) from two fields in Boone, Boone County, IA, wherein field 1 was planted with soybean in 2007, corn in 2008 and soybean in 2009; whereas, field 2 was planted with corn in 2007, soybean in 2008 and corn in 2009. Values are the mean of 30 plates per treatment (15 each from 10-fold and 20-fold dilutions). Data presented here are an average across 10- and 20-fold dilutions. Data was analyzed separately for each year. Means with the same letter are not significantly different (P<0.05). (F1 and F2=field numbers, S1 to S3=soil sample numbers 1 to 3, Soy=soybean, and WW=winter wheat).