Please help me

I have 4 girls growing atm, but one has started to get rust like spot and then dies, starting to take over the whole plant. I look in my setup today and couple of the rest have started to show same problem, iv tried to research on the internet but no straight forward answers. please help me. any help would be greatly appreciated.View attachment 2797309View attachment 2797307View attachment 2797305View attachment 2797306View attachment 2797308