I forgot to prune my summer raspberries after fruiting what can I do now? The canes all look the same colour and the majority of canes had fruited.
The canes should have little side shoots on them from where you picked the berries and be much browner than the new canes for next year.
I wouldn't worry, I don't usually get round to pruning them until Spring and then it's easier to tell which are old and new. Old ones are darker brown with little branches on them as Pierre says.
I've found an article about it, the author prunes his in winter. https://www.permaculture.co.uk/articles/pruning-raspberries-patrick-whitefield-0