Peach Twig Borer vs Walnut Husk Fly

Side-by-side species comparison

Attribute	Peach Twig Borer	Walnut Husk Fly
Scientific Name	Anarsia lineatella	Rhagoletis completa
Order	Lepidoptera	Diptera
Family	Gelechiidae	Tephritidae
Size	12-16 mm wingspan	5-7 mm
Habitat	Orchards	Orchards
Diet	Fruit Feeders	Fruit Feeders
Regions	North America, Europe, Central Asia	North America, Southern Europe
Conservation	Not Evaluated	Least Concern

Peach Twig Borer

A small gray moth whose larvae bore into new shoots and developing fruits of stone fruit trees. It is a key pest in peach and almond orchards.

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Overwintering larvae create small shelters called hibernacula in the crotches of tree branches.

A fruit fly whose larvae feed inside walnut husks, staining and damaging the nuts. It has become an invasive pest in European walnut-growing regions.

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Larval feeding stains walnut shells black, making them unmarketable even though the nut inside may be fine.