Acalitus prunispinosae (Nalepa, 1926)
c. 2 mm high, hard, rounded warts on the branches, often several together and mainly on and around leaf scars and buds. Fresh they are red, later grey, brown or black. Inside irregular galleries, where the mites live.
Rosaceae, narrowly monophagous
Aceria phloeocoptes prunispinosae.
Buhr (1965a), Dauphin & Aniotsbehere (1997a), Farkas (1965a).