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Previously rare, and considered extinct in the UK, since being found in Manchester in 2004 it appears to be on the increase in the North West of England. The beetle and the beetle's larvae host on the grey or speckled alder (Alnus incana) and to a lesser extent black alder (Alnus glutinosa), but will be found on hazel, birch and/or hornbeam if there is a shortage of food. Causing large holes and gaps from the end of April onwards, which are produced by the larvae in the first two stages, but the main damage is only produced by larvae in the third stage.
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Chrysomela populi is a species of broad-shouldered leaf beetles belonging to the family Chrysomelidae, subfamily Chrysomelinae. Notice the small black spot on the hindside. Length is about 10–12 mm. Head and pronotum are black, while elytra is bright red, with a black stain at the base. Some species come as orange coloured. It can be distinguished from Chrysolina grossa by its shorter antennae and less estensive pronotum. It feeds on plants of the Salicaceae species, especially Populus and willow species. It is found in most Europe.
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The rosemary beetle (Chrysolina americana) is a beetle in the family of leaf beetles (Chrysomelidae). The specie lives in the Netherlands as an exotic in comes from the Mediteranean.
Characteristics The scientific name of the specie is first published by Linnaeus in 1758. The specie is day-active and it can become 8 mm. Remarkable are the colourful and shiny shields. The wings are too short to fly. In danger it plays dead. It feeds on the leaves of Rosemary, Sage, Lavendar and Thyme.
