Posted: 20/04/2015 at 20:06
It sounds like scale insects. As this on an edible fruit bush, you need to be careful about what you spray it with. The RHS advice is here:
"Sprays based on natural substances include fatty acids (e.g. Bayer Organic Pest Control or Doff Greenfly and Blackfly Killer ) or plant oils and extracts (e.g. Growing Success Fruit & Veg Bug Killer, Bug Clear for Fruit & Veg and Vitax Organic 2 in 1 Pest & Disease Control). These pesticides have very little persistence and so may need several applications during the scale's egg-hatching period, but they can be used on fruit trees and bushes"