软体动物或其他动物的外壳。主要由石灰质和色素构成，质地坚硬，具有保护功能。
昆明虎耳草的介壳虫是一种害虫，危害了拟南芥海桐花。
The scale insect Paracerostegia kunmingensis Tang et Xie is an important pest that harms the deconative plants Pittosporum tobira.
同时它还利用那些以树液为生的介壳虫助自己扫荡雨林。
It is also wiping out the rainforest, by farming the scale insects that feed on tree-sap.
螨虫、介壳虫和粉虱偶尔也会看上多肉，造成更大的麻烦，而且很难去除。
Mites, scale, and white fly are occasionally attracted to succulents, pose a more serious problem, and are difficult to eradicate.
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