» Agritest    Provide diagnostic kits and related products for plant virus detection and diagnosis.    http://www.agritest.it/

» BIOREBA    Offers antibodies and ELISA kits for detecting virus pathogens in potatoes, grapevines, fruit trees, small fruits, ornamentals, vegetables, and field crops.    http://www.bioreba.com/

» Centre for Innovation and Development in Plant Health    Center at the University of Girona dedicated to research, technology transfer, training and consulting in detection, identification and control of plant pathogens.    http://intea.udg.es/cidsav/eng/index.htm

» Cornell University's Plant Disease Diagnostic Clinic    Provides diagnosis services to extension, homeowners, and commercial growers.    http://plantclinic.cornell.edu/

» Hydros Environmental Diagnostics    Producers of agricultural reagents and diagnostics kits for on site plant disease detection.    http://www.hydros.cc

» LOEWE Phytodiagnostica    Offers high-quality reagents for the detection of plant diseases, and diagnostic testing services.    http://www.loewe-info.com

» Pest Diagnostic Clinic    Provides plant disease diagnoses, nematode counts, and insect and plant identifications. Contains information on submission of samples, fact sheets, and guidelines on nematode and Verticillium (in soil) control.    http://www.labservices.uoguelph.ca/units/pdc/