red spider

US /ˌred ˈspaɪ.dər/
UK /ˌred ˈspaɪ.dər/
"red spider" picture
1.

红蜘蛛, 叶螨

a tiny red or reddish-brown mite that feeds on the sap of plants, often causing damage to crops and garden plants

:
The leaves of the rose bush were covered in tiny red spiders.
玫瑰丛的叶子上布满了微小的红蜘蛛
You need to treat your plants for red spider infestation.
你需要为你的植物处理红蜘蛛虫害。