Myzocallis walshii

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Myzocallis walshii (click on image to enlarge it)
Author: Tom Murray
Source: BugGuide
Myzocallis walshii on oak leaf (click on image to enlarge it)
Author: Andrew Jensen
Source: BugGuide

Myzocallis walshii (Monell, 1879)

This aphid infests oak and is native to North America. It has been reported from Europe since 1988, firstly from France and later from other countries (e.g. Havelka & Stary, 2007).