Plant Small Problem - Small brown spot & 2 Yellowing leaves

Hey guys,

Needing a solution for plant’s health before it could potentially get worse. I’ll give some details and pics of what’s been happening and my opinion on some things I ‘think’ it is.

I don’t want to make it worse giving something that could make it worse or cause another problem.

Days old: Approx 20 days
Humidity: 40-60%
Temperature: 20-29 degrees / 68-84.2 Fahrenheit
Watering: Before transplant every 2-3 days.
Nutes: Only fed 6-7 days ago when in small pots. (1ml) of 13-2-12 in 600 ml water. This because I got stuck with the dreaded slow release fert..... (organic)
Medium is also mixed with 30-40% perlite.

- 7-8 days ago plant had quite a few white flies on it. Was dealed within hours by removing/killing them and then applying organic insectide. 1-2 days later still a few more but basically nothing and no eggs etc. Nothing since then.

- Transplant occurred a bit over 2 days ago from small pots to 3 gal/11 litre fabric pots. Transplant went well. No signs of shock/stress as of yet. Plant still growing. Used same medium. However.. When I saturated the soil in the new plant pot. I added approx 35 ml of organic NPK fert (13-2-12) and mixed in with PH Down to take the PH from 6.9/7.0 to about 6.3. This was in a 9 litre bucket. I then saturated this all throughout 2x3gal/11 litre pots. The medium itself is already fertilised (organic).

This was basically because I wanted to induce bigger growth and the 35ml should see me out of Veg into flower. Not that I wanted it to be this way, it's the only soil I could get. I think I went a bit over board with that feed before transplant. It was distributed between two pots however.

Now the problem is: Yellowing on some lower foliage leaves on 1 plant and rust looking spots. Both increasing in size. This plant also had the most whiteflies on it before dealed with swiftly. A few pics attached.

Plants 10/09/2018 Monday. 1 day before transplant. I didn't get a picture the next day before transplanted but I think its important to note that day was 29 degrees and I had them outside for one last time before bringing inside. Brown/Orange spot appeared before transplant.

Healthy slightly smaller sister yesterday.
Problem sister yesterday. I know it's nothing major but I'd prefer to get in fast to prevent something bigger. Small spot on one of the bigger foliage leaves. Yellowing setting in on same leaf and adjacent lead. Rest of plant looks fine?

Today she seems have yellowed more on those same leaves and spot got bigger and tip near the brown spot has actually gone dark green I think.

Last water was yesterday, very very small. I try my best not to over water and let them dry up.

Instead of watering more, adjusting ph or adding any nutrients etc. I wanted to get a better opinon instead of making it worse/adding another problem.

My rookie research and knowledge believes it could be one of these things:

> Nutrient deficiency
- Calcium (more likely
- Magnesium (more likely)
- Manganese
- Sulfur (less likely)

> White fly damage?
> Soil somehow too acidic in particular spot of soil/near roots?
> PH Lockout due to slow release + organic nutes together. Although only one plant affected/2 leaves so far.
> Fungi > Rust?
> Perhaps nute burn?

I'm not sure and haven't watered or flushed since I gave them a decent water 1-2 days ago when they were transplanted. They seem to have taken well to the transplant I think. Please all opinions welcome, thanks!

EDIT: Sorry just realised the pictures really don't show any thing and I think they look so light green in middle pics due to being directly under CFL. Last picture is accurate for colour. All I know is she is def getting more yellow and that little spot is getting bigger and underside of it darker.

EDIT 2: Applied 5ml of Epsom Salts into 600ml water as foliar spray and small spray around the base of stem. Will water tomorrow and will probably add epsom salts into the water unless things have gotten worse. In that case, I will start to think it's more Calcium/Manganese deficiency or PH related.

Whoa, this is one long story for a dot on a leaf! My feeling is, you are going to love this one to death lol. Let her grow, dumping a teaspoon of epsom into half a litre of water is very drastic, especially for a seedling which doesn't show any signs of a magnesium or sulfur deficiency! You said yourself you think it's calcium, so why dump magnesium and sulfur onto a seedling? From the pics posted, its a dot, it happens, keep a lookout, but i think you're trying to do way too much with something very minor for now that likely isn't even nutrient related.

Haha yeah it is. I'm trying not to be over-zealous and let them take their natural cause. The reason I did such a detailed thread was incase it does get worse and someone could assist me as I always see people posting pictures saying 'What are these brown spots?' and their plant is practically dead... lol. Also incase someone has similar problem. I'm learning a lot by documenting it.

I used approx 50-60 ml of the epsom salt spray on two plants (foliage + surrounding stem) as I was going to continue applying it. I used it also because I kept reading it's very hard to give a plant excess Mag+Sulfur as they use it very fast and they're micronutrients and I don't have any calcium laying around. Seeing as another rusty spot has appeared on the other leaf now, I think I can rule out magnesium now.

Nutrient wise, it will come down to deficiency in Calcium or simply nute burn/ph related.

If it's not nutrient related, what do you think it is?

Thanks.

EDIT: I do have Dolomite lime just incase. They're quite dry now. So I'm going to water them today with a bit of dolomite and check Ph. I think if any thing it may just be the abundance of nutrients in the soil and plant taking in too much, possibly excess potash.

Personally, i think you are way over doing it. Its a minor leaf blemish, maybe it got it from the useless foliar sprays, maybe that marked the leaf up a bit. Foliar feeding with just epsom salt is not very useful without a wetting agent, which im guessing you likely didn't use. Either way, your issue is nothing to do with magnesium or sulfur, and yes, you can have too much magnesium! Plants in mid flower will use it up fast, a seedling like yours, isnt looking for too much at all. The plant is growing just fine in my opinion, the biggest danger it faces is your 'love' If it gets worse at all, post more pics, but to me, its a microscopic blemish on a leaf, it happens. A potassium toxicity does not look like that, a calcium deficient plant would also have more issues than 1 dot on a leaf. A ph issue would also lock a number of elements out at once. Nute burn doesn't leave a dot on a leaf either. Do as you wish, but for now, i think you are doing way too much over something that doesn't appear to be an issue, unless you make it one

That was the first foliar spray I did. Didn’t really want to do it. Not gonna lie though the plant seems to be turning those yellow spots back to greenish so potentially it worked.

But I agree I am concentrating too much on it. I will post more pics if needed, I appreciate your help.

I definitely think you are correct in saying its none of those things because! Outside have a native plant being absolutely swarmed by white flies and it has very similar brown spot damage/small yellowing from the flies.... which makes sense that only one of my girls has the small damage because they were mostly on her and not the other.

Again thanks for your input. By the way, first grow. That might explain a bit

Answer/Culprit: Minor white fly damage. For now.