Garden Pests and Diseases: HELP - I think I have rust fungus, 0 by prudence

prudence wrote:
Can anyone help? I think I have rust fungus spreading through my garden! I have grown a lot of plants from seed this year and to see them slowly being destroyed is heartbreaking. I have posted some pics below - can someone confirm that it is rust fungus or something else and how can I deal with it. Can the plants be saved? I have not had this problem in my garden before.

Sue

First pic is leonotis 'staircase'