I have clear evidence of root-knot nematode damage in my carrots (see pictures). I'd like to decrease their numbers with crop rotation and planting non-host plants. But multiple websites advise getting the soil tested for the specific type of nematode present to be sure of the right management program. Problem is, I don't know where to get my soil tested for nematodes. I picked up soil testing envelopes from the Portage County Extension Office, but I didn't see anywhere on them to request nematode analysis.