Posted: 04/08/2013 at 13:21
Might be thrips, and your plant an acuba japonica.
Buy either pyrethrum if you're organic, or any other general insecticide if you're not, and spray as directed on the bottle until clear. Available from garden centres and large DIY chains - go to a garden centre and tell them what you want if you don't feel confident.
Don't do it in bright sunshine, and wait until evening.
You can trim off the worst affected areas first