HPIPM:Sunflower Mosaic
Author: Howard F. Schwartz and David H. Gent
Identification and Life Cycle
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.
Plant Response and Damage
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.
Management Approaches
Biological Control
No biological control strategies have been developed for sunflower mosaic.
Cultural Control
Sunflower mosaic occurs so infrequently cultural controls are not necessary.
Chemical Control
Fungicides do not control sunflower mosaic.
The information herein is supplied with the understanding that no discrimination is intended and that listing of commercial products, necessary to this guide, implies no endorsement by the authors or the Extension Services of Nebraska, Colorado, Wyoming or Montana. Criticism of products or equipment not listed is neither implied nor intended. Due to constantly changing labels, laws and regulations, the Extension Services can assume no liability for the suggested use of chemicals contained herein. Pesticides must be applied legally complying with all label directions and precautions on the pesticide container and any supplemental labeling and rules of state and federal pesticide regulatory agencies. State rules and regulations and special pesticide use allowances may vary from state to state: contact your State Department of Agriculture for the rules, regulations and allowances applicable in your state and locality.
