Nasonovia ribisnigri

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Nasonovia ribisnigri - winged adult on lettuce (click on image to enlarge it)
Author(s): Whitney Cranshaw, Colorado State University
Source: IPM Images

Nasonovia ribisnigri (Mosley, 1841) - (lettuce aphid)

This aphid is widely distributed in temperate and sub-tropical regions. Direct damage is mainly caused to lettuce and endive where it feeds on the young leaves (the centre of the heads), causing leaf distortion and reducing seedling vigor. Infestations during harvest make the lettuce heads unmarketable. It also feeds on other crops and can transmit virus diseases. For example, it is a vector of Cauliflower mosaic virus, Cucumber mosaic virus and Lettuce mosaic virus.

The life cycle of the aphid includes 2 hosts with the primary host being currant or gooseberry plants (Ribes) to where the winged forms migrate in autumn, overwinter as eggs, and migrate back to lettuce in spring. Propagation on lettuce involves asexual reproduction of wingless forms. Forms without this sexual phase have been also reported.

Vernacular names
• Deutsch: Salatblattlaus
• English: lettuce aphid
currant-lettuce aphid
black currant-lettuce aphid
• Español: pulgón de la lechuga
• Français: puceron de la laitue