HPIPM:Tobacco Streak Virus

From BugwoodWiki

Author: Howard F. Schwartz, David H. Gent, Gary D. Franc and Robert M. Harveson

Tobacco Streak Virus Photo by Howard F. Schwartz, Colorado State University, Bugwood.org Taxonomy Kingdom: Viruses Phylum: Viruses Class: single stranded positive-sense RNA viruses Order: Unassigned single stranded positive-sense RNA viruses Family: Bromoviridae Genus: Ilarvirus Species: TSV Scientific Name Ilarvirus TSV N/A Scientific Name Synonym Ilarvirus N/A N/A

Contents 1 Identification and Life Cycle 2 Plant Response and Damage 3 Management Approaches 4 Biological Control 5 Cultural Control 6 Chemical Control

Identification and Life Cycle

Tobacco streak virus (TSV) or red node is vectored by two species of thrips. In addition to dry bean, other known hosts of the virus include white sweet clover, yellow sweet clover, asparagus and cowpea. The disease is of rare occurrence on the Central High Plains and seldom causes economic loss.

Plant Response and Damage

Red node infection causes a reddish discoloration of nodes at the point of attachment of leaf petioles to stems. In severe cases, infected plants will flex or break at a discolored node. Veins and veinlets of leaves exhibit a red to reddish-brown streaking. Red to reddish-brown concentric rings form on pods which become shriveled or puffy and do not produce seeds. Plants can be severely stunted and killed by the virus.

Management Approaches

Biological Control

No biological control strategies have been developed for red node.

Cultural Control

Red node occurs so infrequently that cultural control strategies have not been developed. The planting of certified seed is advisable since the virus can be seed-borne. Some breeding lines appear more susceptible than others, but the reaction of most commercial varieties is unknown.

Chemical Control

Chemical controls have not been developed for red node. Thrips control is probably ineffective.

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.