Posted: 28/11/2016 at 18:48
Graham, how old are the raspberry canes themselves? The reason I ask is that viruses tend to build up in them over time which reduces their health and cropping potential so it might well be worth digging everything up, replenishing the soil and starting again with fresh stock.
PS: to answer your question, their is no weedkiller which is that selective and, personally I would never use weedkiller anywhere near and edible crop of any kind; It's just not worth the risk as new unexpected side-effects of once-throught-safe pesticides and herbicides are being discovered all of the time.
Last edited: 28 November 2016 19:01:13