Spots on leaves

Hey all! First time grower here encountering my first real issue.
I started 5 white widow plants from seed. Germination started on the 27th of December and started out strong. Originally ran sprouts/ seedlings for the first few weeks in red solo cups under a small t5 light. Transplanted with no problems.

Soil : Happy Frog with a little extra perlite for extra drainage in 5 gallon buckets. Water drains through very well.

Setup: 600w MH until flower in which I intend on switching over to my HS. Temperature stays between high 60s to high 70s with 50 pct humidity.

FIMd about 1 week ago and then 3 days later started started LST. Plants continue to grow pretty well. Just recently started having problems with spots on the lower leaves of 2 of my plants. Looked like pests but I have yet to see anything. Sprayed with Neem oil but has not stopped the spread to younger leaves.

What does this look like to you guys?

Oh... and btw.... I've kept the Ph of my water around 6.0. Most recently i switched over to distilled water just to make sure that there were no impurities that I was unable to gauge myself.

Please guys... my request is a little urgent. I'll be going away for a few days this weekend and would not like to come back to infested unhealthy plants. Your help is appreciated!

Well it doesn't look like pest damage to me. Ideal ph range for soil is 6.3-6.8. In FFOF,, you should be able to use tap water @ 7+ ph and have the soil bring it down to that appropriate range.
If I had to guess specifically, I'd say your leaf spots are a cal deficiency due to low ph lockout, but that assessment doesn't really matter and your issue doesn't look too severe yet.
Try to get your ph up into that range and remember to allow the soil to dry quite a bit between waterings as the ph of the soil is lower when wet and typically rises as it dries out.
Good luck!

Also, if you ph test the runoff and it's quite low, (like 5) flush with a greater quantity of water @ 7ish, as opposed to a smaller quantity @ something like ph 8 or 9+. I made this mistake personally. It can cause something called osmotic shock which is no good.

Ill give it a shot! thanks for the help. Do you think adding some epsom salts to the flush will help with the cal deficiency?

I would not flushhang a bit might get better info,one thing can tell u not bugs

It's definitely not a calcium deficiency.

It's most likely a magnesium deficiency (he's been watering with distiller and not supplementing cal/mag) but if you could post another pic of the underside of the leaf?? Then we will know for sure if there's pest involved or not.

Epsom salt is a magnesium supplement (not calcium). But I would go ahead and foliar spray with the Epsom salt.

Crab Pot said:

It's definitely not a calcium deficiency.

It's most likely a magnesium deficiency (he's been watering with distiller and not supplementing cal/mag) but if you could post another pic of the underside of the leaf?? Then we will know for sure if there's pest involved or not.

Epsom salt is a magnesium supplement (not calcium). But I would go ahead and foliar spray with the Epsom salt.

Click to expand...

BOOM! What he said...

Cool, glad someone more experienced got you (OP) covered at least. Thanks Crab.

Crab Pot said:

It's definitely not a calcium deficiency.

It's most likely a magnesium deficiency (he's been watering with distiller and not supplementing cal/mag) but if you could post another pic of the underside of the leaf?? Then we will know for sure if there's pest involved or not.

Epsom salt is a magnesium supplement (not calcium). But I would go ahead and foliar spray with the Epsom salt.

Click to expand...