|HOFFMAN, G - Oregon State University|
|SULLIVAN, C - Oregon State University|
|ANDERSON, N - Oregon State University|
Submitted to: Plant Disease
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 12/14/2015
Publication Date: 4/8/2016
Citation: Alderman, S.C., Martin, R.C., Gilmore, B.S., Martin, R.R., Hoffman, G.D., Sullivan, C.S., Anderson, N.P. 2016. First report of cocksfoot mottle virus infecting Dactylis glomerata in Oregon and the United States. Plant Disease. 100(5):1030.
Interpretive Summary: Cocksfoot mottle virus (CfMV) is associated with orchardgrass stand decline in Europe, Japan, New Zealand, and Canada. In 2014 and 2015, surveys for CfMV were conducted in the Willamette Valley, OR to determine of CfMV was present in the U.S. In 2014 and 2015, CfMV was found in 61% and 72% of fields respectively. This is the first report of CfMV in the U.S. Additional studies will be needed to determine the impact of the virus in orchardgrass seed production in the U.S.
Technical Abstract: Cocksfoot mottle virus (CfMV) is a beetle and mechanically transmitted, non seed-transmitted sobemovirus associated with orchardgrass (Dactylis glomerata L.) stand decline in Europe, Japan, New Zealand, and Canada. To determine if the virus was present in the U.S., surveys for CfMV were conducted in 2014 and 2015 in orchardgrass seed production fields in the Willamette Valley in Oregon, where most of the orchardgrass seed produced in the United States is grown. In each of 2014 and 2015, 18 orchardgrass fields were selected arbitrarily. Two of the fields were sampled in both years. In 2014 and 2015, CfMV was detected in 61% and 72% of the fields, respectively. Symptoms were not present at the time of sampling. Additional studies will be needed to determine to what extent CfMV is associated with stand decline in Oregon. To our knowledge, this is the first report of CfMV in orchardgrass seed production fields in Oregon and in the United States.