mite|mites

他只往茶里加了一点点糖。

He added just a ___mite of sugar to his tea.

我的植物叶子变黄了，可能是因为有螨虫。

The leaves on my plant turned yellow, probably because of ___mites.

我的玫瑰花叶子上发现了很多螨虫，需要尽快处理。

I found many ___mites on the leaves of my rose plants and need to deal with them soon.