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
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Agriculture and Natural Resources, University of California

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