I lost my first crop to mites late in flower, so I freak on my second try when I see spots on a couple leaves. I take them off and look at under magnification and the good news is it’s not mites. The bad news is I don’t know what it is… anybody know what this is?
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Could be a spot of some kind of fungus. How’s your humidity and airflow?
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Can you take a picture of the leaf in question that isnt a microscope eye view?
Does it wipe off? A good rule of thumb would be peroxide spray. Next day Jacks dead bug. Peroxide…jacks. a week. Kill fungus…kill bugs…prevention for return. Just my thoughts. You are going to win so just let the fix have time to work.
I’m in the southeast so it is hot and humid here. I have 3 fans running plus the inline fan set at a minimum of level 5. Humidity in the tent is in the mid to high 50s. I have 2 small dehumidifiers in the tent and 2 large ones outside. The hygrometer I placed just outside the intake hole shows the air is at or below 40% going in. Of course it’s the most challenging after watering. If it’s mold, I don’t know what else I can do to get the humidity down in the tent. Right now it’s only a few leaves showing these signs. I will remove them when I see them otherwise I’m stumped.
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Lived in southeast. MANY bugs and fungus issues. Lots and lots of foliage in that area. Have to plant a tree here to see 1. Prevention there works well. Be ahead of it.
It doesn’t wipe off. Even with peroxide.
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Next solution then. Others will chime in. We nixed fungus. Not all will wipe off but WPM will. Still peroxide the plant. Jacks or similar also…prevention. If bugs we covered that also. Start watching for spread and then nute/environment come into play. Just me. Do easy basic first then start digging. Saves stress for me.
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Peroxide 20% or so. Rest water. Spray and do not saturate soil with it I suggest.
I’m so afraid to spray anything on them. When the mites attacked I read to spray them just before lights out. Ended up with mold and mites. Lol. This time I just sprinkle some DE around each trunk. Nothing on the plant during flower. Haven’t seen any mites yet. If I get them I have a pest strip to attach to my fan which I’ve been told will wipe out all the insects. I hope I don’t have to use it.
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Did you maybe just spill a tiny drop of nute solution on your leaf?
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A foliar as a regular habit not really good. A foliar for a cal/mag deficeincy…pests…fungus totally ok. That is done either on a schedule…bugs fungus…or as a way to get fast uptake from leaves in need. Constant wetting bad. Kinda what I am getting at is sometimes just doing basic prevention at first worry is cool. Nothing spectacular or hard. Nothing invasive. Nixes the whole line of concern.
Don’t think that’s possible in my setup and which leaves have spots. 
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Your leaf looks very healthy, no nutrient burn no curling or raised margins. If your plant looks equally as healthy I wouldnt freak out. Check under your leaves for bugs and webbing, if none, keep going as is.
Can you tell us what brand and the name of the product. Aside from flying or jumping adult insects I dont understand how this will help, attached to your fan. Bugs would have to fly or jump into and against the breeze of your fan to land on your strip.
Sticky traps would be more effective layed down, sticky up, on the surface of your topsoil.
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It’s not a sticky trap… I got the idea from this YouTube video.
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I love 420 scene! I was looking at the company website for this product and they say not to use in places where humans linger for 4 or more hours. As well as not on or above any furniture. This product definatly leaves a residue on the surface of things. If you use this product do a bud wash for sure, tbh I wouldnt even use it at flower times.
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Mine is in a garage workshop so i don’t worry about the things he mentions. But like you, i worry about the pesticide being on the buds which is why i said i hope i don’t have to use it. All i know is when i treated my first grow with green cleaner it got mold… so i definitely don’t want to put anything wet on the plants during flower when the humidity is already impossible to bring below 50%… i was so upset after all the time money and effort to get started… at least with the strip there is no associated humidity issue.
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Its not because of the cleaner. Even the humidity itself isnt at fault. Humidity combined with insufficient ventillation and or still air environment is the culprit. If you spray leaves again, turn your fan up for the night. During flower I wouldnt spray anything.
Either way, even if you dont spray, i recommend a bud wash. I use a 3 part system here is a link to a post in my journal that shows my wash buckets and whats in them, as well as a couple vids further down the thread that explain budwashing.
Good luck.
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