How to Manage Pests

Pests in Gardens and Landscapes

Seasonal development and life cycle—Viruses

Viruses can be transmitted by insects, such as aphids or whiteflies feeding on plant sap, or mechanically in sap that is spread by hand or grafting tools. Viruses also commonly spread in seed, pollen, or in vegetative parts of plants used for propagation through budding and grafting. Once a plant becomes infected with virus, it usually remains infected throughout its life.

Green peach aphid colony
Green peach aphid colony

Hand tools can help spread viruses
Hand tools can help spread viruses


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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