Rabdophaga justini Barnes, 1935
Larvae in separate, oval chambers in the xylem of one year old twigs. The bark on top is not galled, but it becomes discoloured and lightly frayed. Moreover, before pupating in the gall chamber, the larvae prepare an exit hole in the bark for the imago. If the gall is located not far from the top, then the shoot above the gall mostly dies off. Bivoltine.
Occasionally, the larva chamber may be located in the midrib of a leaf.
Barnes (1951a), Buhr (1965a), Dauphin & Aniotsbehere (1997a), Gagné (2010a), Redfern & Shirley (2011a), Roskam & Carbonnelle (2015a), Skuhravá, Skuhravý & Meyer (2014a), Stelter (1989b).