Can someone help me identify what is wrong with my plant?

A couple of my plants of the same strain are all starting to show the same symptoms over the last couple of weeks. Pretty much all of my leaves are getting small rust circles and starting to turn yellow around the edges. The spots came first and now the yellowing. It seems to be killing alot of the leaves. I'm not sure if its a disease or a deficiency as its my first grow this year. Also around some of the bud sites the leaves and hairs are turning a dark purple almost black like shown on the pictures attached.
These plants have been in the ground since june and have been doing awesome until now. They are 8-9 ft bushes. They are planted directly into the ground. Bottom third of holes are subcools super soil recipe. The other 2/3 of hole is happyfrog and composted horse manure mix. I use compost and seed sprout teas, and have done some top dresses throughout the year with worm castings, kelp meal, epsoma garden tone and most recently top dressed with mr. Bs green trees for flower.
Thanks ahead for any help!
 

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I’m in the middle of my first grow. I am an avid gardener as well though. It looks like you have some sort of disease. It wonder if your roots are diseased. Maybe there is some fungus in your soil that isn’t good for the plants.
 
It probably is.
I'm worried it is leaf septoria.
There isn’t much you can do but take the affected leaves off. If they all have them your plant is already suffering. I don’t know how it will affect cannabis. You might not see flower if they survive. It’s a lot of stress.
 
It probably is.

There isn’t much you can do but take the affected leaves off. If they all have them your plant is already suffering. I don’t know how it will affect cannabis. You might not see flower if they survive. It’s a lot of stress.
At least cut off the blackened colas. They aren't in flower so if it can rebound it will just be a normal topping in the end.
 
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