palmerworm

详细解释:n. 毛虫

详细解释：

palm.er.worm

n.（名词）
Any of several caterpillars that injure fruit trees by feeding on their leaves, especially the small green caterpillar of the North American mothDichomeris ligulella.
小舌麦蛾：吃果树的叶子而伤害果树的毛虫，尤指北美洲飞蛾的小绿毛虫小舌麦蛾

来源：
[From the way they suddenly appear in large numbers like a throng of pilgrims]
[源于他们象香客一样突然大量出现]