I planted a ribes sanguineum in my garden several months ago. It appears to be fairly healthy, but ... First, the plant is getting lots of new growth, but the new growth is infested with what I believe are aphids. Are the aphids a concern? If so, what is the best way to deal with them? Second, the older leaves on the plant are getting brown spots. Is this normal? If not, what might be causing it? The aphids? Thanks in advance for your help.