Cecidophyopsis grossulariae (Collinge, 1907)
the mites cause deep, hairy cavities at the underside of the vein axils; the leaves become distorted and discoloured. They hibernate in the outer layers of axillary buds, which may damage the enclosed flower primordia.
R. nigrum and rubrum are secondary host plants.
Amrine, Duncan, Jones, Gordon & Roberts (1994a), Hummer, Postman, Carter & Gordon (1999a), Ripka (2007a), Skoracka, Lewandowski & Boczek (2005a).