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Potato Virus Y - USA: New Strains

Tennessee Pest Management Information Network - TNPMIN - Pest Alerts

The Tennessee Pest Management Network is a component of the Southern IPM Center.

Below is a listing of information of possible interest to you:


Potato Virus Y (PVY; type member of genus Potyvirus) is one of the most damaging potato viruses affecting crop yields and tuber quality. PVY can also affect tomato, capsicum, and some other related species. Symptoms vary depending on viral strains and susceptibility level of host cultivar. They may include mottling, distortion and necrosis of leaves and stems, premature defoliation, tuber necrosis and plant death, or no symptoms at all.

PVY is transmitted by aphids in a non-persistent manner, with Myzus persicae being the most efficient vector. PVY can also be spread by mechanical means, plant-to-plant contact, or with infected planting material such as seed tubers. Disease management of PVY and other potato viruses relies largely on clean planting material and use of resistant crop varieties, but reduction of available virus reservoirs and vector numbers may also be useful.

The emergence of new PVY strains has recently been reported from different areas (see URLs listed below). Numbers of co-infecting strains will build up with every crop cycle if PVY infected seed tubers are used, especially if these are moved to different areas where the virus strains they carry may combine with local PVY populations.

Maps - USA: and Individual states via:
Pictures PVY symptoms on potato: (leaves), (leaves), (plant)
PVY particles, electron micrograph: Aphid vector Myzus persicae: vector
Links Information on Potato virus Y: and
Information on PVY and other potato viruses: and
Review and diagnosis of PVY strains:
PVY taxonomy and description:


Direct any additional questions concerning Tennessee's program to:

Darrell D. Hensley
University of Tennessee
Entomology and Plant Pathology
2431 Joe Johnson Drive, 205 PSB
Knoxville, TN 37996-4560
Phone 865-974-7958
Fax 865-974-8868
email =

Funding for the national network of Pest Management Centers was authorized by Section 406 of the Agricultural Research, Extension, and Education Reform Act of 1998. As the result of a second competitive process in 2003, four IPM Centers across the United States were again funded in FY 2003, with the Southern Region Center located at the NSF Center for IPM at North Carolina State University.