The root of a plant that grubs or insects typically eat; roots damaged or killed by grub damage.
Compound word from 'grub' (insect larva or the act of digging) + 'root' (underground plant part). Likely agricultural terminology from the 18th-19th centuries.
Grubroot is pure agricultural wisdom—farmers recognized that grub damage to roots was so specific and destructive that they named it, connecting the pest to the damage pattern!
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