If they are aphids, which will normally be seen on the underside of the leaves, then spray the leaves with a soap and water solution, washing-up liquid works fine. You could of course use a commercial bug killer but soap and water is kinder to the environment and cheaper.

I wouldn't use a commercial bug killer on raspberries, your going to be eating that fruit.

Do aphids eat leaves? I find only slugs and caterpillars like Raspberry leaves.

I think you are probably right Kildermorie, to be honest I don't worry about the leaves getting eaten...

If they are summer fruiting raspberries its time to cut out the old canes. If its the new ones I'd just give them plenty of water to encourage the plants to make lots more new ones. Have youa photo of the bugs?

Not with us yet Stera, we only started harvesting our rasps a couple of weeks ago...

Oh - mine are all done - waiting for the autumns to flower now. Probably Leicestershire will be half way between us.

Probably...