Vasates quadripedes, the maple bladder-gall mite, is an eriophyid mite in the genus Vasates, which causes galls on the leaves of silver maple (Acer saccharinum), red maple (A. rubrum), and sugar maple (A. saccharum).[1] The gall is rounded, sometimes elongate, and has a short, thin neck. Typically, galls are in diameter, and may be numerous on the upper surfaces of leaves.[1] They have an opening in the lower surface. At first they are yellowish-green or bright red, later they become dark red and black.[2]
In Britain, the mite affects introduced silver maple. The species is relatively new to Britain, being first recorded in London in 2002.[3]