The gall is a subconic, deformed bud 6 to 12 mm in diameter. It is a variable greenish or pinkish [sic] and frequently with a distinct whitish bloom. The hollow interior contains several larvae ...
β- EP Felt, JM Clarke: (1915) 29th report of the State entomologist on injurious and other insects of the State of New York, 1913Β©
Reference: https://www.biodiversitylibrary.org/page/35015542#page/194/mode/1up