Erthesina Fullo (Yellow-Spotted Stink Bug) 黄斑亀虫（キマダラカメムシ）

Japanese follows English. 英語の後に日本語が続きます。

This is Erthesina fullo or more commonly the yellow-spotted stink bug or yellow marmorated stink bug on a leaf of the woodland elaeocarpus. I found an ant on another leaf above the bug (see the 2nd photo) and thought that the ant would be eaten or attacked, but don't worry! The yellow-spotted stink bug is phytophagous (i.e., herbivore). 

The bugs are beautiful (especially the striped legs!), but stink as the name suggests and a pest of many plants including fruits, such as oranges, apples, cherries, pears, and kiwifruit.

Erthesina fullo 黄斑亀虫

Yellow-spotted stink bug キマダラカメムシ

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黄斑亀虫（キマダラカメムシ）だと思います。隣の葉（ホルトノキ）にアリがいたので食べられちゃうのかなと思ったのですが大丈夫。キマダラカメムシは草食です。ただ足が縞々でこんなに綺麗なのに農業害虫でミカン、ウメ、カキ、ナシ、モモ、サクランボ、ビワ、リンゴなどを食べちゃうそうです。

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