That's pretty low RH for veg. I don't think it's an issue. Them there's flowering numbers!
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Many thanks for that link.I love that you took a pic of every single leaf you removed! Have you settled on septoria? Since you're nowhere near flower yet you could go with copper:
"Broad spectrum fungicides and disease control sprays will usually do the trick. For extra protection, try opting for a copper-based fungicide. Either way, remember to carefully follow the package instructions when using any kind of disease control agent, and avoid getting any of it on your buds."
Or start with something less toxic:
"If you’re after a more natural alternative, we suggest turning to essential or horticultural oils like neem. Neem oil is commonly used to treat all kinds of garden pests and diseases and can easily be applied to your plants using a mister."
Rooster builds those for all his plants. Here is the tutorial!
breath (more co2 for your plants).
Leave on your leaves if you can, not if they're going to spread diseases to the other leaves.
I suggested too much pesticide might be the cause of the burning leaves. Still think that. And i think if you have septoria it's more of a problem then the few leaves with holes. Pt said wait a few days and see what happens. I agree.
If it spreads, it's only neem that will help among what you have. You don't have a bug-infested grow that needs to be sprayed every day so take some time off from chasing pests and see what happens with the yellow.
Rotate insecticides if you are fighting a losing battle against bugs. I don't think you are. Take a break and see what happens next. Your plants could use a breather too .