A small, clustered, rosette deformity arising from the closely set buds, the tip of the twig apparently becoming stunted as a result. The individual galls are about 2cm long, 1 cm in diatmeter and composed of numerous closely set, aborted leaves, the central ones somewhat longer than the others and variously curled.
”- EP Felt, JM Clarke: (1915) 29th report of the State entomologist on injurious and other insects of the State of New York, 1913©
Reference: https://www.biodiversitylibrary.org/page/35015489