I have used my plant identifier to determine that my raspberries have leaf rot. From what I read it seems that I should clip off the affected leaves . I am wondering if that would be just the wilted leaves or the ones also that have the early yellowing that precedes that. I also read that I should use a copper spray . I read somewhere that it needs to stay on the surface and not enter the plant? I am not quite sure on that but it makes me wonder if I should spray first and cut the bad leaves off later . Could you please advise as to whether I should do both things. cut bad leaves and spray ? thank you.