cutworm

名词 cutworm:

1. North American moth whose larvae feed on young plant stems cutting them off at the ground

cut.worm

n.（名词）
The larva of various moths of the family Noctuidae that feed on and destroy a wide variety of plants.
切根虫：任一种夜蛾科的蛾子幼虫，取食并破坏多种植物

来源：
[So called because many species eat through stems of plants]
[之所以如此称呼是因为许多种类能咬穿植物的茎]