Leaf spot

Hi fellow growers,

I wanted to get other points of view on a leaf spotting issue which is affecting my out door grow, now for the second year (see photos)
I think this is caused by Septoria fungi and affects leaves in humid regions.
I am around the 1 month from the start of flower so have a small window to treat this as best I am before it causes a big problem to my years harvest.
Having looked online for various solutions, I think the best approach to help this problem at this stage would be using an anti fungus spray with Chlorothalonil. Has any one experienced the same problem, have you beaten the issue, what was the long term attack on the issue and what’s your thoughts to the approach ?
really would appreciate peoples thoughts on this before I pull the trigger!

thanks in advance!

That is black spot i have had good luck using copper fungicide every 3 days until under control then once a week. If you do nothing it will be a slow death for the plant.

Thanks Thumper60. I assume this is a foliage spray, does this also help eliminate the spores in the soil too?

I applied two types today, both suggest its good for black spot, I will see how this workout in the coming week.