Virus Testing Services

Control of plant diseases begins with accurate identification of the causal agent; viruses are particularly difficult to identify by symptoms alone. The Virus Diagnostic Lab (formerly ELISA Lab) was created in 1980 at the Washington State University Prosser Irrigated Agriculture Research and Extension Center to provide virus identification. The Virus Diagnostic Lab (VDL) was initially established to provide information to cherry growers so they could make informed decisions about disease management in their orchards. Now under the auspices of the CPCNW, we offer extensive laboratory testing services to help a wide variety of crop growers reduce the spread of disease caused by virus and virus-like pathogens. We provide testing for many viruses that infect a wide range of fruit, vegetable, seed, forage, and horticultural crops.

Diagnostic Testing

The CPCNW offers ELISA (enzyme-linked immunosorbent assay) testing services through the VDL. ELISA is a serological procedure to identify viruses and provides results quickly. Our skilled laboratory technicians also offer PCR (Polymerase Chain Reaction) testing services to identify viruses and virus-like agents. High-throughput testing (sometimes referred to as Next-generation sequencing) is also available. These tests provide rapid, accurate information to our customers.

The ELISA procedure provides results quickly and is cost-effective for large quantities of samples. We can customize our services to your needs. In the VDL, we routinely test for viruses in the following commodities:

  • Alfalfa: alfalfa latent virus, alfalfa mosaic virus
  • Apple trees: apple chlorotic leafspot virus, apple mosaic virus, tomato ringspot virus
  • Asparagus: asparagus virus 1, asparagus virus 2, tobacco streak virus
  • Beans: alfalfa mosaic virus, bean common mosaic virus, bean common necrosis virus, mosaic virus,
    peanut stunt virus, tobacco ringspot virus, tobacco streak virus, tomato ringspot virus
  • Corn: high plains disease virus
  • Grapes: grape leafroll virus
  • Stone fruit trees: apple mosaic virus, cherry leaf roll virus, prune dwarf virus, Prunus necrotic ringspot
    virus, tomato ringspot virus
  • Peas: pea enation mosaic virus, pea leafroll virus, pea seed-borne mosaic virus
  • Roses: apple mosaic virus, Prunus necrotic ringspot virus, tobacco streak virus
  • Small fruits & berries: tobacco streak virus, tomato ringspot virus
  • Vegetables: cucumber mosaic virus, squash mosaic virus, tobacco ringspot virus

All of our testing services are available for a fee to growers, field consultants, county agents, regulatory agencies, researchers, and the general public.

Fill out the following form and return to Tina Vasile

CPCNW-VDL Testing Agreement

Hours and Location

  • Hours: 7:30 AM – 4:00 PM, Monday – Friday
  • Location: 24106 N. Bunn Rd., Prosser, WA 99350


Please contact ELISA Lab Manager Tina Vasile (509-786-9382) for pricing information.