Its over-fed, but can anyone get specific?

I have 2 black widow plants that are considerably smaller than the rest in the tent since they got seeded 2 weeks later then got behind on top of it.
I know they are over fed, but im hoping to learn something here from it and maybe figure out what its getting too much or not enough of.
Im not really in a position to change anything to make them happier (RDWC with 5 different strains), just here for the learning experience so I know specifically what this issue is if I see it again.
Most of the growth on top has these little yellow/orange spots. Its been like this for a while but still seems to be growing fairly strong.

Have you checked for spider mites?

That is exactly what my leaves looked like when I had them.

shawnery said:

Have you checked for spider mites?

That is exactly what my leaves looked like when I had them.

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Yeah I havent seen any pests anywhere.
Its just the 2 black widow plants and theyve looked about the same for maybe 2 months? Theyve still been growing and even getting some nice looking buds in now.
New growth comes in fine and then they get like that. It seems to be more so the top leaves that show it the most.

My only thought is that its just that strain wanting a lot of calcium and its been showing a deficiency the whole time. 4 other strains in there and none of them have any issues.
Only using RO water + Megacrop not adding any calmag. I did read in the MC thread about some ppl having to use some calmag still for certain strains.

Im not overly concerned about those 2 plants at this point, they pushed out some beautiful buds in the last 2 weeks. Just trying to learn something today.

Could be mag def?

I was thinking you had both but if you've really checked for bugs then you're good to go. It's just those little tiny dots I've had multiple times, big spider mite population here, and each time I found mites.

I bet calcium deficiency. Top growth small yellow spots that turn to rust looking spots.

goatlicker said:

Could be mag def?

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Would make sense for the same reason as above.

stoned-monkey said:

I bet calcium deficiency. Top growth small yellow spots that turn to rust looking spots.

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Yes, I would say that is the best explanation that I would be able to give for what theyre doing.
So pretty much just have to run some calmag if I want to grow this strain again.

shawnery said:

Have you checked for spider mites?

That is exactly what my leaves looked like when I had them.

Click to expand...

stoned-monkey said:

I bet calcium deficiency. Top growth small yellow spots that turn to rust looking spots.

Click to expand...

^ both

I hate to beat a dead horse, but check for mites...again and again. Your leaves are indicative of an infestation. Look carefully.

Your leaves are very green and as you've alluded to, perhaps they have been a little over fed. Sometimes too much N will lock out other nutrients, which could be why they look a little short on Ca and Mg. If you're using RO water and adding nothing for additional Ca or Mg, you may want to add something to make up for this if your nutrients aren't enough.

CannaCountry said:

Your leaves are indicative of an infestation. Look carefully.

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Spider mites are the easiest insect to spot on a pot plant, because once they are established you won't need a scope to spot them, their webs will be everywhere.
I'm betting on a magnesium/calcium def.
If he wasn't using a supplement, he should have, especially at a month into bloom.

I agree; an "established" colony of spider mites will have webbing everywhere. However, waiting until you see the webbing is waiting way too long. The small dots all over the leaves will be the first signs they are present.

All you have to do is hold the leaf up to the light and see if you have light shinning through.

Yeah I've kept a pretty good eye on pests, and as i said in one of my long winded replies, they've looked like this for months already and haven't gotten any worse or spread to any other plants.

The yellow mottling actually looks a bit too thick to be spider mite damage & its usually tiny white specks, it could be some type of other pest,nutrient or disease oriented.

Here are pics of the two plants and close ups of 2 of the worst looking leaves. One of them has been touching 2 other plants for weeks and the other two show no issues.
These are near teh door of my tent and have a few dog hairs in the last 2 pics lol.