n. 幼虫的粪便；蛀屑
Frass of long-horned beetle larvae plays an important role in natural enemies searching for their cerambycid hosts.
长角甲虫幼虫的部分在寻找天敌的天敌中起着重要的作用。
The number of emergence holes and frass holes in weeping willows on both Banks of Qinhuai river are investigated.
调查了外秦淮河两岸垂柳上光肩星天牛羽化孔、排粪孔的分布情况。
Frass of longhorned beetle larvae plays an important role in natural enemies searching for their cerambycid hosts.
天牛幼虫排出的虫粪所释放的挥发性物质成为天敌搜寻天牛所在微栖境的重要化学信息物质。
Field tests showed that females gnawed significantly fewer oviposition scars on Pinus massoniana trees treated with hexane extracts of larval frass than on the control trees.
林间驱避试验结果说明，幼虫虫粪的己烷提取物处理过的树干上的刻槽数明显少于对照树干上的刻槽数，二者具有极显著差异；
Frass是昆虫学中的专业术语，指昆虫幼虫在取食或活动过程中排出的排泄物或残留碎屑，常见于植物叶片、木材孔洞等昆虫栖息处。这一物质通常由未被完全消化的植物纤维、木质素及代谢废物组成，形态多为颗粒状或粉末状。
Frass的形成与昆虫的摄食行为直接相关。例如，天牛幼虫在蛀食树木时，会将咀嚼后的木屑与排泄物混合排出，形成条状或颗粒状堆积物。这种物质不仅是昆虫活动的痕迹证据，也反映了昆虫与宿主植物的相互作用。
"Frass" 是一个昆虫学领域的专业术语，具体含义和用法如下：
如需例句或更详细用法，可参考《欧路词典》 或专业昆虫学文献。
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