How to Manage Pests

Pests in Gardens and Landscapes

Seasonal development and life cycle—Potato leafroll

Potato leafroll virus can be introduced to a potato field by infected seed tubers or by aphids that have fed on infected potato plants. The most efficient vector of the virus is the green peach aphid. Several minutes to hours are required for the aphid vector to acquire the virus, but once the virus has been acquired, the aphid carries it for life. Winged aphids carried in air currents spread the virus over long distance, and wingless aphids are important in spreading it from plant to plant. Aphid feeding introduces potato leafroll virus into the food-conducting tissue of a plant vascular system, where the virus multiplies, spreads, and initiates disease. Potato leafroll virus is not transmitted mechanically.

Green peach aphid colony
Green peach aphid colony

Plant infected with potato leafroll virus
Plant infected with potato leafroll virus

 


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