Cause Daphne-infecting viruses such as Cycas necrotic stunt virus (CNSV, Nepovirus) which was prevalent in Korea, Carnation mottle virus (CaMoV, Carmovirus) has been found by the OSU Plant Clinic, Cucumber mosaic virus (CMV, Cucumovirus), Daphne virus S (DVS, Carlavirus), Daphne virus X (DVX, Potexvirus), Daphne virus Y (DVY, Potyvirus), Daphne mosaic virus (DapMV, Potyvirus), a tobamovirus, Alfalfa mosaic virus, Arabis mosaic virus, Tobacco ringspot virus, and some other poorly characterized rod-shaped or isometric viruses have been reported. Many of them can be transmitted by aphids and all of them can be transmitted through vegetative propagation. Multiple infections are common with at least 3 viruses found in plants in Korea.
A mosaic disease of D. odora was reported in New Zealand but was later attributed to cucumber mosaic virus.
Symptoms A variety of symptoms may occur including lack of vigor, stunting, chlorotic spots, ring patterns, and leaf mosaic. Systemic warping and distortion on the leaves has also been reported. Daphne with distorted (wrinkled) leaves and mosaic symptoms have been observed in Oregon. Many infections may be symptomless.
Cultural control
- Remove and destroy infected plants.
- Propagation material for new plants should be from certified virus-tested (and found to be free of all known viruses) cuttings only.
Chemical control It is not known if insect vector control would be a useful management tactic for these diseases.
Reference Lee, B. Y. and Ryu, K. H. 2009. Incidence of virus diseases and RT-PCR detection of Daphne-infecting viruses in Korea. European journal of plant pathology, 124:127-132.