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/

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

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

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

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