Qí cáo shì jīn guī zǐ de yòuchóng, zhù zài nítǔ lǐ chī zhuāngjia de gēn.
The white grub is the larva of the scarab beetle and lives in the soil eating crop roots.
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history
螬 is not used alone in modern Chinese. It exists almost only in the bound word 蛴螬 (qícáo), the white grub, a root-eating agricultural pest mentioned as far back as Mencius.