Testing for Plant-parasitic Nematodes that Feed on Corn in Iowa 2000-2010

Fig. 3. Geographic distribution of the number of samples submitted to the ISU Plant and Insect Diagnostic Clinic from corn fields to be tested for plant-parasitic nematodes from 2000 to 2010. There were 310 total samples with a corresponding county of submission. An additional 75 samples were submitted from out of state corn fields (not shown on map).



Image from Plant Health Progress article:
Testing for Plant-parasitic Nematodes that Feed on Corn in Iowa 2000-2010