The U.S. Department of Agriculture Animal and Plant Health Inspection Service and the California Department of Food and Agriculture (CDFA) confirmed the positive identification of citrus yellow vein clearing virus (CYVCV) in a residential citrus tree in the Lodi area of San Joaquin County.
The plant sample was confirmed positive for CYVCV on July 7 following a routine multi-pest survey conducted by CDFA. In response, a half-mile plant quarantine has been established around the detection site to help prevent the artificial spread of the disease. The quarantine area is 1 square mile.
CDFA officials, in coordination with the San Joaquin County agricultural commissioner, are surveying residential properties within the quarantine area. They are collecting samples from host plants for additional testing. The quarantine may be expanded following any additional CYVCV-positive tree detections.
While this is the first detection of CYVCV in San Joaquin County, it is not the first detection in California. The virus was previously identified in residential citrus trees in Tulare County in 2022 and Los Angeles County in 2023. To date, the disease has not been detected in any commercial citrus groves.
CYVCV reduces citrus tree vigor and yield and may result in a reduction of fruit size, which can have a negative effect on fruit quality.
The virus can be spread by pests as they feed from tree to tree, including citrus whitefly, green citrus aphid, melon or cotton aphid and cowpea aphid, which are known to be present in California. CYVCV can also be spread through grafting and the movement of infected propagative materials and rootstocks and through contaminated tools and equipment.
While there is no treatment for CYVCV, the best way to prevent its spread is by controlling pest populations and sanitizing all tools and equipment.
More information about CYVCV can be obtained from the CDFA Pest Hotline at 800-491-1899 or from the CDFA website.
Source: San Joaquin County, California
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