Tomato spotted wilt virus is more common in dahlias than impatiens necrotic spot virus. Both can cause many symptoms, including mosaic patterns on leaves, distorted leaves, stunted plants, dead stem sections, spots and ringspots. Dahlia mosaic virus, transmitted by aphids, is also very common. It can cause stunting and yellow bands along leaf veins. Other symptoms, including mosaic and leaf distortion, can follow.
Some varieties can be symptomless, or develop symptoms that later disappear.
We can test dahlia tubers. Please call for more information if you would like to send tuber samples.