yellow spots on leaves overnight

skunkhunt · May 10, 2026

Hello fellow growers
woke up to my plants looking like someone left little piss drops over some leaves

Did some inspection with my microscope but couldnt see any bugs. Could it be from too much light/heat? I was gradually raising the intensity of the light over the last two days. Light sits at 20 inches at 65-70% of 300w, ppfd measured at 350-420 with photone(although my phone is not that great) and temperature at 26-28°C. They are 20-23 days old autos.
Thanks

Gmix · May 10, 2026

I would look at the underside of the leaves again
You might not see them look for the eggs.

Hossgrows · May 10, 2026

How old are they. Have they been fed/watered...when/what. Medium looks dry af.

I had similar problems with two plants, compared to the other three of the same strain.
Slow growth, spots, rough leaf surfaces, oddly enough they kept at it, never grew out of it. Discarded both, in the name of bad genetics. Unfortunately the other three were males...so lost all five. Happens with regs

Here's a side by side next to a healthy one.

Ninjadogma · May 10, 2026

skunkhunt said:
Hello fellow growers
woke up to my plants looking like someone left little piss drops over some leavesView attachment 2638541 View attachment 2638542 View attachment 2638535 View attachment 2638536 View attachment 2638537 View attachment 2638534
Did some inspection with my microscope but couldnt see any bugs. Could it be from too much light/heat? I was gradually raising the intensity of the light over the last two days. Light sits at 20 inches at 65-70% of 300w, ppfd measured at 350-420 with photone(although my phone is not that great) and temperature at 26-28°C. They are 20-23 days old autos.
Thanks

I don't know, to me it looks like you've got bug speckle AND photobleaching going on. There's no harm in hitting it with a natural insecticide at lights out if for nothing else as a preventative measure, and you can back the light off a smidge, make sure there's sufficient trace mag in the dirt for what the light might strip out. If its early symptom of deficiency it's going to be a micro. But it looks different, like mild chemical or light burn on sub tissue.

skunkhunt · May 11, 2026

They are 24 days old. I ve only given them ph regulated water up until 4 days ago when i first fed them with nutrients. Some of it did spill on the leaves could that cause that big a problem? I am using the Mills starter pack. The affected leaves were looking worse today should i remove them?View attachment 2639303 View attachment 2639305 View attachment 2639306 View attachment 2639304

I checked again for bugs and nothing,not sure about eggs though.The only thing i have right now for pest control is cannacure. Is it any good?
Thanks

TannedViking · May 11, 2026

This looks a lot like mite damage. Light damage looks different thats for sure.

Ninjadogma · May 11, 2026

skunkhunt said:
They are 24 days old. I ve only given them ph regulated water up until 4 days ago when i first fed them with nutrients. Some of it did spill on the leaves could that cause that big a problem? I am using the Mills starter pack. The affected leaves were looking worse today should i remove them?View attachment 2639303 View attachment 2639305 View attachment 2639306 View attachment 2639304

I checked again for bugs and nothing,not sure about eggs though.The only thing i have right now for pest control is cannacure. Is it any good?
Thanks

If it was from nutes you spilled, there would probably be unmistakable burn spots where those droplets hit. Unless you used a foliar, it's probably not chemical burn.

You mentioned pH regulated water. Are you up against a particular issue with your water that's forcing you to adjust? If you used a pen and it wasn't calibrated, the value could have been much lower than you thought it was when you were adjusting, and that could potentially cause what we are seeing with a pH related lockout developing. If you don't HAVE to, it's better not to screw with your pH at all. When you're mixing nutes you want to check value because they can push it hard one way or the other, but for tap... Shouldn't be a worry under normal circumstances.

skunkhunt · May 13, 2026

My tap water water is around 7.5-7.8 and i drop ir to 6.2-6.7 but my pen is good. I calibrated just to be sure even though its new. The plants are looking better now i keep checking for bugs but nothing. I ll buy some pesticide though

yellow spots on leaves overnight

yellow spots on leaves overnight

skunkhunt

Gmix

Hossgrows

Ninjadogma

skunkhunt

TannedViking

Ninjadogma

skunkhunt

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