Help with Septoria leaf spot!

[MJmadscientist]

Hey everyone! As in my previous threads this years weather was bad. Too wet for too long.
While different strains of septoria I had it on tomato’s and in some vines.

Well I’ve got it on my cannabis now! Lucky me. I imagine it’s on all of them but only see signs on a few.
It’s early just a few yellow leaves at bottom. They were removed. A few fan leaves that were yellowing had spots showing. So it’s septoria.
I’ve never dealt with it where I had any yellow leaves in the past. I always caught it as tony brown spots or the weather was less favorable for it spreading in years past.



I have already sprayed neem max in the last couple days and that was prior to noticing it for what it was. I used 2.5 ounces to the gallon of water.
Over and under the leaves.

Is this the best way to get rid of it?
How often do you have to treat this?

I have some copper sulfate that mixes in water but it’s organic but not sure about spraying it with CP crystals?

 

[LoveGrowingIt]

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[LoveGrowingIt]

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[MJmadscientist]

Anybody have actual experience with it? Neem Max effective?

Is septoria as aggressive with cannabis as some other plants?
It seems to overtake tomatoes and pumpkins

 

[dankstranger]

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.

 

[MJmadscientist]

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.

Oh yeah. I’m very aware of phytotoxicity with neem and several other products.
I use a surfactant in it and I spray during the cool of the morning usually when leaves will soak it up and dry off.

What’s the biofungicide? I have several products but most I don’t want on plants I’ll be smoking.