Rhopalomyia californica
bud gall, usually Terminal, lobed and succulent
This species is multivoltine. Eggs are laid in terminal growth, and the hatching larvae crawl between bud scales where the buds begin to form.
Similar galls occur on B glutinosa in Oklahoma, but it is not known whether R californica is responsible for that gall also.
”- Raymond J. Gagne: (1989) The plant-feeding gall midges of North America©