The ribosomal DNA of Cecidophyopsis spp. were studied by PCR amplification, followed by restriction enzymes analysis. Specimens from Ribes nigrum (black currant) from 6 countries (Scotland, England, Poland, Finland, Sweden and New Zealand) produced the same digestion pattern, which was distinct from the pattern for mites found on R. rubrum from Poland and Finland and for R. grossularia [R. uva-crispa] from the USA, indicating that each Ribes species is host to a different mites species, C. ribis, C. selachodon and C. grossulariae, resp. Two other mite samples from R. alpinum and R. aureum were identical, but distinct from each of the other species.