HELP! Light green spots on leaves! What is this?

[Bartholomew]

As the title says. Should I be worried? Any help would be much appreciated!

Link to my current grow topic if you want more info: https://forum.growweedeasy.com/forum...p-system/page2

[Mr.furley]

Are you in soil? coco? What kind and how much nutes?

[Bartholomew]

I'm gonna get a digital soil ph tester in a few days to get that exact root ph. So far the runoff has been in the normal. The high ppm is due to going by Canna nutrient schedule. Full strength at this stage 900ppm total it says. Since cal mag isn't part of their schedule a full dose of cal mag raises the ppm to around 1000 and add ph down the total ppm will be around 1100 or so.
I let it dry in the first few weeks, going for a hydro experience now.
Curling leaves are from a week or two ago when I had a ventilation accident. The temps raised to 40C for some hours. Fixed that and have had no problems with temps or curling since then. Temps are constant 20.5C - 26C.
Honestly the spots don't resemble nute burn. The spots resemble tobacco mosaic virus but it's really unlikely that the plant is infected.

But I'll try your suggestion once I get the soil ph meter. Thanks!

[Mr.furley]

http://www.growweedeasy.com/how-often-water-marijuana

[Bartholomew]

Yes I'm aware of that but I'm using a drip feed system. Coco can be treated like soil when hand watering but it can also be treated like hydro with a drip feed system or even by hand watering. It's hard to over water in coco. I'm using airpots and fabric pots.

I think the conversation is getting derailed here. I don't really have a problem with the "spots" on leaves because the plants are growing rapidly. I just want to know what the spots are and should I be worried. I have not found any similar symptoms on the net after extensive searching. The only one that came close was TMV.

[Mr.furley]

[DoctorJohnson]

Those leaves look mildly heat stressed (the curling).

[Bartholomew]

Yes I had a ventilation accident briefly a week or two ago

[D.A.A.S.69]

Hello Bartholomew, How old are your plants ? Is it cold weather where you live ?

[Bartholomew]

Yeah I'm probably over thinking things. Well thanks anyways for your input.

I'm suspecting bad ph at root level though although I measure the runoff collected from all 9 plants in one tray and it's 6.0. Gonna measure with a soil ph meter in a few days.

[Bartholomew]

By the way, did you take a look at my plants and room in the main topic? Would appreciate if you could give your feedback

Link in my signature

[D.A.A.S.69]

Yes I did, they are young an don't need much but water an food at the proper ph. Give them a chance to grow an get their roots growing down. Worst thing you can do is try experiments on them, let em grow 4-5 days an see what they look like, if still bad, flush..
They might surprise you. Good Luck. Nothin to worry about now.

[DoctorJohnson]

Those leaves look mildly heat stressed (the curling).

[MadMike]

I was thinking heat stress as well, but maybe light burn adding to it? The spots do look odd though. Not a great match for light burn.

Looking at it again this morning, I'm wondering if the spotting is early stage phosphorus deficiency? Reading your grow, the pH doesn't look like a cause. Could deficiencies be caused by heat stress? Haven't seen anything on heat related deficiencies but it seems possible to me.

[Bartholomew]

Hey Mike,

Yeah I thought so too about light burn, but nah. The more I look at it, the more I see TMV. Some plants have it, others don't. All are growing in the exact same conditions.
I probably had a mild lockout, did a flush. New growth seems fine. Still some plants still present the weird spots on new growth while others don't.