How to Manage Pests

Pests in Gardens and Landscapes

Seasonal development and life cycle

Tristeza virus is spread through budding and grafting or by aphids feeding on citrus. The melon aphid, Aphis gossipyii, is the vector for all tristeza isolates found in California; it does not, however, transmit all isolates equally well. Symptoms of tristeza become more apparent during the hot summer months, when increased water needs cannot be met by the declining root system. Changes in virus virulence may occur over time and affect the current tolerance of many cultivars.

Melon aphids
Light and dark forms of melon aphids


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/GARDEN/FRUIT/DISEASE/LIFECYCLE/lctristeza.html revised: April 25, 2014. Contact webmaster.