1. Plant Disease
  2. Host and Disease Descriptions

Dahlia-Ringspot

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Latest revision: 
March 2024
Image related to Dahlia-Ringspot

This is a digitized picture of a color slide which was taken from the original (old time) glass slide.

OSU Extension Plant Pathology Slide Collection, 1958.

Image related to Dahlia-Ringspot

Numerous necrotic lesions due to this virus. This is a digitized picture of a color slide which was taken from the original (old time) glass slide.

OSU Extension Plant Pathology Slide Set, 1958.

Image related to Dahlia-Ringspot

Close up of typical circular line pattern in the leaf.

OSU Extension Plant Pathology Slide Set, 1991.

See:

Greenhouse Plants, Ornamental - Impatiens Necrotic Spot

Symptoms Several different symptoms may occur when infected by Tomato spotted wilt virus (TSWV) or Impatiens necrotic spot virus such as a yellow-green mosaic, irregular concentric rings, or wavy-line patterns in older leaves. Stunting or leaf distortion does not occur. Necrotic leaf spots, flower color break and tuber decay and/or desiccation have also been associated with TSWV.

Reference Gleason, M.L., Daughtrey, M.L., Chase, A.R., Moorman, G.W., and Mueller, D.S. 2009. Diseases of Herbaceous Perennials. APS Press, St. Paul, MN.