Report
X-disease phytoplasma (Western X) in Washington
Washington State University Extension fact sheet, 401E, Washington State University Extension
09/2025
DOI:
https://doi.org/10.7273/000007536
Abstract
X-disease also known as Western X, Cherry Buckskin, and Peach X, is not a new disease, but Washington is experiencing new complications. X-disease is present across North America, widespread throughout Washington State, and occurs at high incidence in Yakima, Benton, Franklin, Grant, and Chelan Counties. It is also present in Douglas, Okanogan, Klickitat Counties, and in Oregon in The Dalles area. It was first identified in Washington State cherry trees in 1946. In a 1947 survey, about 1% of cherry trees were found to be infected, and it has remained present ever since, fluctuating in frequency. However, it has increased in prevalence dramatically in recent years, with pathogen strains, vectors, and environmental conditions that were not present in the previous outbreak. 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 nectarines, X-disease symptoms are typically yellowed, curled, and shot-holed leaves, and small, deformed fruit.
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Details
- Title
- X-disease phytoplasma (Western X) in Washington
- Creators
- Tianna DuPont (Author) - Washington State University, WSU Extension ANRScott Harper (Author) - Washington State University, Department of Plant PathologyTobin David Northfield (Author) - Washington State University, Department of EntomologyLouis Nottingham (Author) - Washington State University, Department of EntomologyAdrian Ty Marshall (Author) - Washington State University, Department of EntomologyRodney Cooper (Author) - Washington State University, Department of EntomologyCorina Serban (Author) - Tree Fruit Research LaboratoryBernardita Sallato (Author) - Washington State University, WSU Extension ANR
- Academic Unit
- Publications, WSU Extension
- Series
- Washington State University Extension fact sheet; 401E
- Publisher
- Washington State University Extension; Pullman, Washington
- Number of pages
- 12
- Identifiers
- 99901295396101842
- Language
- English
- Resource Type
- Report