''Phratora interstitialis'' is a species of

leaf beetle The insects of the beetle family Chrysomelidae are commonly known as leaf beetles, and include over 37,000 (and probably at least 50,000) species in more than 2,500 genera, making up one of the largest and most commonly encountered of all beetle ...

in the family

Chrysomelidae The insects of the beetle family Chrysomelidae are commonly known as leaf beetles, and include over 37,000 (and probably at least 50,000) species in more than 2,500 genera, making up one of the largest and most commonly encountered of all beetle ...

. It is found in Europe and Northern Asia (excluding China) and North America. This leaf beetle feeds on host plants that are poor in salicylates (e.g. ''Salix alexensis'' and ''Salix sitchensis'') and is closely related to the European ''

Phratora vulgatissima Phratora is a genus of leaf beetles. It is synonymous to ''Phyllodecta'' . European ''Phratora'' species can be distinguished based on morphology of female genitalia., but they differ little in size and body form and most show metallic col ...

'', which also feeds on salicylate-poor willows.

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Further reading