Spider mites and other mites
nymphs and adults cause damage to the host plant by feeding on plant sap. They mainly occur on the underside of leaves where they pierce the cells and suck [...] empty dead cells become yellow, and in many plants the damage can also be seen on the upper surface of leaves as small yellow dots. The destruction of cells [...] also produce webs, and plants can be completely covered with such webs in which the mites live. The webbing and spotting on the leaves affect the appearance