gall mite
noun
1.
a mite of the family Eriophyidae that feeds on plant juices, damaging buds, leaves, and twigs and causing galls and other deformities.
Origin
1880-85
British Dictionary definitions for
gall mite
gall mite
noun
1.
any of various plant-feeding mites of the family
Phytoptidae
that cause galls or blisters on buds, leaves, or fruit