WSU Whatcom County Extension

Integrated Pest Management for Blueberries

Tomato Ringspot

Tomato Ringspot Virus (TRSv)

Diseases

 

Symptoms

Infected plants may look the same as healthy plants or be smaller and less vigorous; however, leaves are often malformed and are diffusely mottled, chlorotic, dwarfed and may develop characteristic bright yellow bands along the main veins. In addition, stems, twigs, and branches may exhibit circular, brownish necrotic spots. Younger terminal leaves tend to be strap-shaped and have a mottled pattern (alternating yellowish to greenish stippling). Shoot dieback, stunting, and plant death may eventually occur. Fruit yield and quality are severely depressed.

 

Life History

The disease is transmitted by the dagger nematode, Xiphinema americanum, which feeds on the roots of infected plants then spreads the virus to healthy plants in a circular pattern at a rate of about 3 feet per year in all directions.

 

Monitoring

During the spring, check for bushes with shoot dieback or stunting and leaves with chevron or mottled pattern. Send samples to a qualified lab for positive identification of the virus. Tag infected plants.

 

Thresholds and Management

Infected plants should be removed and destroyed and the soil tested for the presence of nematodes. The soil should be fumigated before replanting with virus-tested clean stock.

 

Resources

Michigan State University, Michigan Blueberry Facts, Tomato Ringspot Virus
http://www.blueberries.msu.edu/tomatoringspot.htm

Oregon State University Extension, An Online Guide to Plant Disease Control, Blueberry Virus Diseases
http://plant-disease.ippc.orst.edu/ShowDisease.aspx?RecordID=191

Washington State University, Hortsense, Blueberry Viruses
pep.wsu.edu/Hortsense/scripts/query/displayProblem.asp?tableName=plant&problemID=740&categoryID=2

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WSU Whatcom County Extension • 1000 N. Forest St., Bellingham, WA 98225 • (360) 778-5800 • whatcom@wsu.edu