UC IPM Home > Homes, Gardens, Landscapes, and Turf > Vegetables > Diseases

How to Manage Pests

Pests in Gardens and Landscapes

Seasonal development and life cycle—Virus diseases

For the most part, beet western yellows (BWYV), lettuce mosaic, and lettuce infectious yellows (LIY) occur sporadically. All of these pathogens have numerous alternate crop and weed hosts. These pathogens are spread by insect vectors that have fed on the sap of infected plants (aphids, primarily green peach aphids, for beet western yellows virus and lettuce mosaic and whiteflies for lettuce infectious yellows virus).

Cheeseweed is an alternate host for some viruses
Cheeseweed is an alternate host for some viruses

Statewide IPM Program, Agriculture and Natural Resources, University of California
All contents copyright © 2013 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. /PMG/GARDEN/VEGES/DISEASES/LIFECYCLE/lcletvirus.html revised: May 31, 2013. Contact webmaster.