Sunflower mosaic can be caused by three different viruses, namely Cucumber mosaic virus, Sunflower virus, and Tobacco mosaic virus. The most common virus causing sunflower mosaic is Cucumber mosaic virus. This virus can be mechanically- and aphid-transmitted and has a broad host range. Aphids can acquire and transmit Cucumber mosaic virus within 5 to 10 seconds of feeding. The virus can overwinter in many ornamental plants and weeds.
Sunflower mosaic symptoms are most pronounced on leaves younger than 2 months old, appearing as yellow (chlorotic) rings or green to yellow mottling. Affected plants are stunted and have narrow, light brown streaks on petioles and stems. Heads of infected plants are malformed and produce shriveled seed. The disease is rarely an economic problem in the High Plains.
No biological control strategies have been developed for sunflower mosaic.
Sunflower mosaic occurs so infrequently cultural controls are not necessary.
Fungicides do not control sunflower mosaic.
Categories: Sunflower, Disease, Sunflower Mosaic
Date: 3/10/2005