dankstranger said:

Neem's not gonna do much for septoria man. Copper can help but only if you're still in veg and you do it right. Don't just dump copper sulfate crystals in water or you'll burn the hell out of your leaves.

First thing you gotta do is clean up what you got. Strip all the infected leaves plus a little extra around them. Bag it and trash it, don't compost that stuff. Thin out the bottom foot or so of scraggly growth so air can move through better.

Put some mulch down around the base, like 2-3 inches of bark or straw. Stops the soil from splashing up on the leaves when you water. And water at soil level only, don't get the leaves wet.

If you're still in veg you can rotate between a biofungicide like Serenade and some copper. But make it proper bordeaux mix with the lime to buffer it, not just straight copper sulfate. That stuff will fry your plants.

Do the bio spray this week, copper next week, then back to bio. Keep it going every 7-10 days while the weather's wet and humid.

If you're already flowering skip the copper and oils completely. Just stick with the biofungicides and focus on airflow and sanitation.

That neem you sprayed isn't gonna hurt anything but it's not really the right tool for this job. Oils can actually make things worse in wet weather because they hold moisture on the leaves.

Wait at least a week between any oil spray and copper or you'll get nasty reactions.

Don't spray anything when it's over 85-90 degrees or in full sun either.

Main thing is keep the leaves dry, get good airflow, and clean up any infected material right away. The sprays are just backup.

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