Brown spots on just a few leaves

Can anyone tell me what these brown spots are? They just appeared on 3 leaves that were all together. I removed them, but can‘t see a reason. I don’t see any bugs other than a couple ladybugs that are in the room. Other than the spots plants are healthy. The plants are Sour Diesel at week 7 of flower. Growing in coco/perlite, gh 3 part nutes, HLG 650 R light, ph is at 5.9.




Here‘s a couple pics of the plants.

I found them on two more leaves, they are all in a definite pattern with even spacing. I just installed a light rail, I think it must have dripped something that left the spots. They are evenly spaced apart, in a straight row, and don’t exist anywhere else.

Hmmm. Was thinking maybe downy mildew. But if its just under a light rail perhaps youre on to something.

By chance did you drip on those leaves. Looks like watermarks from getting wet and burning under your intense light, lol. I took a shot and think lm right. Took a second look now editing. They got wet or splashed on somehow, your all good.

Southernontariogrower said:

By chance did you drip on those leaves. Looks like watermarks from getting wet and burning under your intense light, lol. I took a shot and think lm right. Took a second look now editing. They got wet or splashed on somehow, your all good.

Click to expand...

That’s what I was thinking from the consistent spacing. I think there was some kind of liquid on the light rail when I put it up and it dripped off as it was slowly moving. Had me worried for a bit though.

Cant say 100% for sure, but had a few droplets from a sprayer i was using... on my lower set of the older nodes...and it did exactly or as best as i can tell.. exactly it did to your plant...light cooked through the droplets in like mere hours

have you checked the ph and ec/ppm of the medium? stems are not suppoed to be purple like that. and leaf curling

The ph is good. There was a bit too much nitrogen for the Durban Poison. The Sour Diesel seems to like the higher nitrogen, but I lowered it a bit this week because of the browning tips and bit of curl.