Skip to main content
ARS Home » Pacific West Area » Parlier, California » San Joaquin Valley Agricultural Sciences Center » Crop Diseases, Pests and Genetics Research » Research » Publications at this Location » Publication #421126
Research Project: Identifying Vulnerabilities in Vector-host-pathogen Interactions of Grapevine and Citrus Pathosystems to Advance Sustainable Management Strategies

Location: Crop Diseases, Pests and Genetics Research

Title: Host range and transmission of Citrus yellow vein clearing virus: California isolates

Author
item Sun, Yongduo
item Helm-Rodriguez, Sydney
item Yokomi, Raymond

Submitted to: Citrograph
Publication Type: Trade Journal
Publication Acceptance Date: 1/6/2025
Publication Date: 3/1/2025
Citation: Sun, Y., Helm-Rodriguez, S.D., Yokomi, R.K. 2025. Host range and transmission of Citrus yellow vein clearing virus: California isolates. Citrograph. 16(2):68-72.

Interpretive Summary: Citrus yellow vein clearing virus (CYVCV) was detected in citrus and some citrus relatives in dooryards in Tulare and Hacienda Heights, California. This marks the first time the virus was detected outside of Asia or the Mediterranean region. This virus is reported to be vectored by whiteflies and aphids and is mechanically transmissible to some herbaceous plant species. This report provides an update on ARS research to confirm insect and mechanical transmission with strain(s) of CYVCV in the greenhouse. No citrus-to-citrus vector transmission or mechanical transmission to non-citrus hosts was obtained despite numerous attempts during the past year. This research is continuing since these data are contrary to published reports on CYVCV. It remains critical to clarify transmission mechanisms of this virus to determine the risk of virus spread to commercial citrus and its impact on citrus production.

Technical Abstract: Citrus yellow vein clearing virus (CYVCV) is a newly introduced virus detected in residential properties in citrus and citrus relatives in Tulare and Hacienda Heights, California. CYVCV is reported to be transmitted by whiteflies and aphids and infects a wide range of hosts including citrus, grapevines, and herbaceous plants. Therefore, research was initiated to determine the host range and transmission of California isolates of CYVCV. Our CYVCV isolates infected multiple citrus cultivars and citrus relatives through bud grafting. However, mechanical transmission to non-citrus plants previously reported as hosts of CYVCV including grapevines, common beans, and cowpeas was unsuccessful. Moreover, citrus to citrus transmission of the virus by various whitefly and aphid species have not yet resulted in CYVCV transmission after multiple attempts this year. Although our research continues, this research update should be of interest to California citrus growers.