How to Manage Pests

Pests in Gardens and Landscapes

Tristeza disease complex

Citrus trees infected with tristeza show light green foliage, poor growth flushes, and some leaf drop. The trees may produce a heavy crop of small fruit because girdling at the bud union prevents starch transport to the roots. Diseased young trees bloom early and abundantly and begin producing fruit 1 to 2 years before healthy ones do.

Life cycle


Management of the tristeza complex depends largely on preventative measures, such as using tolerant rootstocks and tristeza-free propagation material. Disease spread cannot be prevented completely.

Citrus tree
Citrus tree affected by the Tristeza virus

Statewide IPM Program, Agriculture and Natural Resources, University of California
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