Hi, something happened to my black currant. The leaves have dark-brownish spots. I don't know what it is. Right now I only found 3 leaves like this. Not sure if there is any natural soap that I can use to spray the black currant. I don't want to use any chemicals. Any ideas? Should I remove all the diseased leaves? Please see the pictures.
I forgot to mention that I just bought 3 black currant bushes 2 weeks ago. They are all quite young. Only one has this problem right now.
I don't know much about plant disease unfortunately, but that looks like a virus or fungus. I would remove any infected plant parts, sterilize your clippers between cuts in bleach solution, and burn everthing you remove.
