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''Agelastica alni'', the alder leaf beetle, is a species of leaf beetle (Chrysomelidae) in the genus ''Agelastica''. ''Agelastica alni'' is distributed in Europe, the Caucasuses, Siberia, north-eastern Kazakhstan, and in the 19th century was introduced to the USA (Kolk & Starzyk, 1996). 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. == Description == The alder leaf beetle is a relatively small beetle, around 6–7 mm, black or metallic blue in colour. The larvae are normally black. Image:Erlenblattkäfer.jpg|Alder leaf beetle laying eggs. Image:Agelastica_alni_larva_3_beentree.jpg|Larva of the alder leaf beetle Image:Alnus glutinosa agelastica alni 2 beentree.jpg|The skeletonized remains of a black alder File:Agelastica_alni_(female).ogv|Video of a pregnant female on alder File:Agelastica alni - 2014-05-26.webm|Video of a ''Agelastica alni'' in Germany 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Agelastica alni」の詳細全文を読む スポンサード リンク
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