WSU Extension


Dahlia : Virus
(revision date: 4/23/2014)

Tomato spotted wilt virus (thrips vector) induces a yellow-green mosaic, irregular concentric rings, or even wavy-lines in older leaves. Dahlia mosaic virus (aphid vector) produces chlorosis along veins and may shorten internodes, facilitating a stunted or bushy appearance. The tomato-ringspot-related virus (probably nematode vector) produces necrotic patches and marginal necrosis on the leaf blade.
Management Options

Non-Chemical Management
  • Select and plant only virus-tested (and found to be free of all known viruses) stock.
  • Destroy affected plants
  • Control thrips and aphids which serve as vectors for virus spread.
Select non-chemical management options as your first choice!

Chemical Management

None recommended

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Caption: Dahlia mosaic virus symptoms
Photo by: R.S. Byther
Caption: Tomato spotted wilt virus symptoms on dahlia
Photo by: R.S. Byther
Caption: Virus symptoms on dahlia
Photo by: R.S. Byther