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ARS Home » Pacific West Area » Wapato, Washington » Temperate Tree Fruit and Vegetable Research » Research » Publications at this Location » Publication #419421
Research Project: Integrated Approach to Manage the Pest Complex on Temperate Tree Fruits

Location: Temperate Tree Fruit and Vegetable Research

Title: X-disease phytoplasma (Western X) in Washington

Author
item DUPONT, TIANNA - Washington State University
item HARPER, SCOTT - Washington State University
item NORTHFIELD, TOBIN - Washington State University
item NOTTINGHAM, LOUIS - Washington State University
item Marshall, Adrian
item Cooper, William
item SERBAN, C - Washington State University
item SALLATO, B - Washington State University

Submitted to: World Wide Web
Publication Type: Other
Publication Acceptance Date: 12/13/2024
Publication Date: 9/30/2025
Citation: Dupont, T., Harper, S., Northfield, T., Nottingham, L., Marshall, A.T., Cooper, W.R., Serban, C., Sallato, B. 2025. X-disease phytoplasma (Western X) in Washington. World Wide Web. https://pubs.extension.wsu.edu/product/x-disease-phytoplasma-western-x-in-washington/;FS401E.

Interpretive Summary:

Technical Abstract: The X-disease phytoplasma (Candidatus Phytoplasma pruni) is the primary cause of small, pale, tasteless, and unmarketable cherries in Washington State. In peaches, plums, and necatarines, X-disease symptoms are typically yelowed, curled, and shot-holed leaves, and small deformed fruit. There are no direct cures for X-disease, so management strategies rely upon suppression of vector populations, cultural methods to reduce X-disease risk, and prompt removal of diseased trees. The extension factsheet published by researchers with Washington State Univerisity and USDA-ARS in Wapato, WA describes in detail typical symptoms of X-disease, biology of the leafhopper vectors of Phytoplasma pruni, and options to manage the risk of X-disease in cherry and stone fruits.