The University of Maryland no longer operates a Nematology Laboratory.
Home gardeners should work with the Home and Garden Information Center to solve landscape problems (HGIC website).
Nematode Assay Laboratory
115 Price Hall
Blacksburg, VA 24061-0331 Phone: (540)231-4650
Web site: https://www.ppws.vt.edu/extension/nematode-laboratory/index.html (for sample submission instructions, fees and forms)