Rhagoletis completa

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Rhagoletis completa (click on image to enlarge it)
Author: Marcello Consolo
Source: Flickr

Rhagoletis completa Cresson - (walnut husk fly)

This fruit fly attacks walnuts in the Americas and was introduced into Europe (first record in Switzerland in 1988). It has since spread to many parts of Europe by adult dissemination and hitchhiker behaviour. The larvae breed in the husks and yield losses can reach 80%.

The adults are around 8-10 mm long, brownish with parts of the body whitish and black wing markings. The species is closely related to another North American walnut fruit fly, Rhagoletis suavis, and was previously regarded as a subspecies of R. suavis.

Vernacular names
• Deutsch: amerikanische Walnußschalenfliege
• English: walnut husk fly
• Français: mouche des brous du noyer

For a review see Verheggen et al., (2017).