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Labs testing for Little Cherry Virus and X-disease Phytoplasma

Labs with current proficiency tests

In order to help the industry manage X-disease and Little cherry disease WSU is providing support for commercial labs including updated protocols, positive controls, training where possible and proficiency testing. For more information and results from previous proficiency tests see Proficiency testing results history (2023.05.15)

All participating labs generally have a 1-2 week turn around time currently.



AGNEMA Labs, 1320 E Spokane St, Suite A Pasco, Washington 99301, 509-255-3744, Choose forms > Little Cherry Disease sample submission form

Eurofins Cascade Analytical

1008 W. Ahtanum Rd. Union Gap, WA 98903. (509) 452-7707 For courier service and additional drop locations visit Fruit Tree Disease Diagnostics Sample Submission Form (pdf) (

IEH Cashmere

201 S Division St, Cashmere, WA 98815 Download form Phone: (509) 782-1500 Attn. Christine Bender

WSU Pullman Plant Diagnostic Clinic

Plant Pest Diagnostic Clinic, 509-335-3292

Qualterra, Inc.

1610 NE Eastgate Blvd., Suite 850, Pullman, WA 99163, Qualterra
Contact: Shara Green – 509-945-3514 or


The Oregon State University Plant Clinic

can test for both Little cherry virus 1 and 2, as well as X disease (Western X). For information, please visit their web site at OSU Plant Clinic. A list of services and fees are available at the “Submit a sample” pull down menu.

Agromillora Quality Assurance Lab

9375 NE Warmington RD, McMinnville, OR 97128. Phone: (971) 237-3566. Visit their website for more information about testing services: Quality Control Laboratory – Agromillora.


AL&L Crop Solutions, Inc.

7769 N. Meridian Rd. Vacaville, CA 95688,

Sierra Gold Nurseries

Learn more about our Quality Control Laboratory and our Pathogen Screening services. 5320 Garden Highway Yuba City CA 95991 (530) 674-1145


If you are a lab that would like to do X-disease phytoplasma and Little cherry virus testing we are happy to provide the same support for all labs. Download Recomended Protocols 2024.04.14 and Proficiency testing 2024 directions.

Proficiency testing for 2024 is planned for June once positive tissue is available in the field..

Washington State University