This page contains symptoms produced by various viruses that infect Dahlia.
The most common symptom is ‘mosaic’. It is evident by the presence of a mixture of dark green and light green ‘islands’ or patches on leaves.
Dahlia Mosaic Virus
![Bright green spots on malformed and regular leaves.](https://wpcdn.web.wsu.edu/cahnrs/uploads/sites/51/IMG_0749jpg.jpg)
Symptoms on young plants include Chlorotic, yellow spots and malformed leaves. Infected plants may look stunted.
![Narrow leaves and pointed leaves with bright green and light green coloring pattern on their surface..](https://wpcdn.web.wsu.edu/cahnrs/uploads/sites/51/IMG_0744jpg.jpg)
Chlorosis of leaves can be limited in size on the leaves initially and can spread to the rest of the plant.
![Bright lime green on the edge and veins of the dark green leaf.](https://wpcdn.web.wsu.edu/cahnrs/uploads/sites/51/IMG_0755jpg.jpg)
Some leaves may show severe Chlorosis compared to other leaves on the same plant.
![Bright green and yellow leaves.](https://wpcdn.web.wsu.edu/cahnrs/uploads/sites/51/IMG_0761jpg.jpg)
Severe infection often leads to yellowing of almost all leaves and stunting of plant.
Impatiens Necrotic Spot Virus
![Lime green concentric-like rings on the end of a dahlia leaf.](https://wpcdn.web.wsu.edu/cahnrs/uploads/sites/51/insvondahliajpg.jpg)
Characteristic Symptom is necrotic ring spots on leaves.