Beginner Gardening: Help, please. Dying leaves on plant - is it due to bug?, 1 by tikva18

tikva18 wrote:
I have a geranium 'johnson's blue' - that has leaves that are curling up and have black spots on them. I think it must be due to a bug? Next to this, I just replanted (it died over the winter - maybe due to same problem? carypoteris - that is now also showing the same symptoms. Lastly, in the same portion of the bed, I have a salix integra - hakiro nishiki - that is dying. I didn't think that would pull through the winter, but it did. It partly leafed out and now is dying.
What do I need to do to save these plants?