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Labs testing for Little Cherry Virus and X-disease Phytoplasma

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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 for previous proficiency tests download here

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 A list of services and fees are available at the “Submit a sample” pull down menu.

AGNEMA 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  


Four additional labs are planning to participate. NuPhy Plants <>, Agdia <>, All Crop Solutions <>, and IEH <> are planning to participate for the 2021 season. All have received the updated protocols and are gearing up to take the April proficiency test.

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 Recommended Protocols Download letter with details and Proficiency testing protocols (2020.12.19). Proficiency testing for 2021 is planned for February, April and June. Samples are planned to be distributed to interested labs Feb 1, April 1 and June 3, 2021. Samples results should be returned to WSU for analysis and posting Feb 15, April 15 and June 17.

Washington State University