The only time i saw a lot of septoria on a trimming gig, the plants were stacked at about 90%, like they just dont care, but that was the late Freezeland…

You might be screwed in flower. Copper maybe but usually if I catch it early enough I’ll defoliate like almost 100 percent and let new leaves hopefully grow un affected. Sure it sets back the plant about a week or so but better than no plant at all…

It is a persistant soil born disease often specific to cannabis, some people will abandon a site after it gets serious, it probaly will be more and more apperant through the years… but i’m thinking that you can keep working that soil with loads of biologicaly activ stuff if that is not too demanding, also might help to skip a year, but keep the soil activity active with compost and another type of plant in the same spot, my big hole by the house had a soil shiddiz, like verticilium or pythium, but it seems to be absent after two years of adding compost, then last winter i took out 80% of the soil to let it sit in a pile overwinter and then ammended massively in early spring to let that cook again for month, then i put the soil back in the hole a week before planting, that is by tha way one full cubic meter of soil, going on year 6 or 7.. not sure, but she s got issues again, but not from soil microbes, she’s had ants…gotta look into cinnamun some more for that shiddiz, cause ants wreak havoc like hearding pest that bring on more shiddiz…ok nuff shiddiz, cheers, grow strong, grow sterdy…

My girlfriend just asked; where is the guy you are giving so much time and advice to, and i’m like; well i dont have clue, but he’s growing bushcraft and that is so cool ’cause by now, we are a rare breed… so i just want to make a finnal comment, you maybe better off not replanting cannabis in that soil, thats what most people would recommend, septoria is very persistant, but for now, the way i see it, generaly speaking; if the level of infection is low or absent for the first month and a half of the plants life you probaly will get a decent harvest anyway…that is also strain dependant, but my point being that a plant that has a healthy first month,,will be better prepared to fight off disease. Crop rotation in full soil is probably a good preventive mesure against septoria…in the bush you can do tomatoes, but it all depends how long you want to re-use the same site…cheeers.

Take the best care of them that you can. And hopefully they can fight off disease. Or at least maintain. I’ve never dealt with that specific situation. Where are you?