The most common problem is the Mealy bug, which feeds on plant SAP.

粉蚧是个常见的问题，它以生石花的汁液为食。

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The sap of this plant blisters the skin.

这种植物的汁液会使皮肤起水疱。

《柯林斯英汉双解大词典》

Also known as plant lice, aphids are tiny soft-bodied insects that suck the nutrient-rich SAP from the stems of plants.

蚜虫是一种很小的软体昆虫，以吸取植物枝干里的营养汁液为生，也被称为植物虱子。

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To deserve the name, it must be distilled only from the sap of the Mexican blue agave plant.

ECONOMIST: Protectionism, or quality control?