The mite causes patches of felty erineum on the lower surface of the leaves, followed by blisterlike swelling on the upper surface. The affected leaves eventually become distorted and curled. The erineum patches are whitish at first, then yellow and finally brown.

Erineum patches were also found on young stems.

Travares (1903) refers to an eriophyid species as the origin of an erineum of A. canariensis. He describes the cecidum as follows: "On the upper side of the leaf one finds very pronounced papulae corresponding to brown-haired depressions on the lower side."