UC IPM Online UC ANR home page UC IPM home page

UC IPM Home

SKIP navigation

 

How to Manage Pests

UC Pest Management Guidelines


Yellow leaf streaks and crinkled leaves caused by Onion yellow dwarf virus.

Onion and Garlic

Onion Yellow Dwarf

Pathogen: Onion yellow dwarf virus

(Reviewed 1/07, updated 1/07, corrected 6/09)

In this Guideline:


SYMPTOMS AND SIGNS

The first symptoms of onion yellow dwarf in young onions are yellow streaks at the bases of the first true leaves. All leaves developing after these initial symptoms show symptoms ranging from yellow streaks to complete yellowing of leaves. Leaves are sometimes crinkled and flattened and tend to fall over. Bulbs are undersized.

This virus is part of the virus complex that causes GARLIC MOSAIC.

COMMENTS ON THE DISEASE

The onion yellow dwarf virus is a potyvirus that has a narrow host range (onions, garlic, shallots and a few ornamental alliums). It survives in bulbs and sets and therefore can be transmitted during vegetative reproduction. Although the virus is not spread to the seed, seed from infected plants is of poor quality. It can survive in volunteer onions. It is spread from plant to plant by the green peach aphid, Myzus persicae, and other aphids in a nonpersistent manner.

MANAGEMENT

Controlling the aphids does not prevent the disease, because they quickly transmit the virus as they move through the crop in search of preferred hosts. Use true onion seed rather than sets. Use virus-free planting stock (in garlic, indexing for the virus and meristem tip culture eliminates the virus). Rouge infected plants.

There is no chemical control for this disease.

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Onion and Garlic
UC ANR Publication 3453
Diseases
R. M. Davis, Plant Pathology, UC Davis
B. J. Aegerter, UC Cooperative Extension, San Joaquin County
Acknowledgment for contributions to Diseases:
F. F. Laemmlen, UC Cooperative Extension, Santa Barbara/San Luis Obispo counties
R. E. Voss, Vegetable Crops, UC Davis

Top of page


Statewide IPM Program, Agriculture and Natural Resources, University of California
All contents copyright © 2014 The Regents of the University of California. All rights reserved.

For noncommercial purposes only, any Web site may link directly to this page. FOR ALL OTHER USES or more information, read Legal Notices. Unfortunately, we cannot provide individual solutions to specific pest problems. See our Home page, or in the U.S., contact your local Cooperative Extension office for assistance.

Agriculture and Natural Resources, University of California

Accessibility   /PMG/r584101511.html revised: April 25, 2014. Contact webmaster.