Weird leaf issue

I've already scoured google images, ilgm, thcfarmer and now I've decided to post here bc it's the best forum. I'm growing in a 2x4x5 tent outside. I have four plants in there in smart pots under LED lights. Grow medium is soil. Nutrients are dyna grow. They're on 12 and 12 right now. One issue that I'm aware of is that it gets really cold here at night. And I know that's why the leaves are dark colored. But I'm wondering what the yellow is on there. It doesn't seem to be uniform. It looks more random. And that's the thing that's more concerning to me is that it's not uniform. If it was more symmetrical I would think that it was something else. But because it looks so random that I think (and I'm hoping it's not) pests. I got a Jeweler's loop and I investigated this leaf thoroughly. I haven't seen any larvae, egg sacks, or bugs sitting on it. But I am not really sure what this is. And it's not on all the leaves on the plant it's only on a couple. But I'm about 9 weeks into flower. The strain is Bad Azz Og Cheese, photo from seedsman. If this is an issue then I want to nip it in the bud immediately so that it doesn't get to be something that's a serious problem.

The rusty speckled look on fan leaves is usually a sign of Calcium deficiency. When you say its cold, how cold?

Low Ca is mainly rust-coloured spots but a couple of bad leaves on a plant do not mean there's anything wrong. Any real deficiency will affect a whole class of leaves like low Mg will start causing a lot of old fan leaves to begin yellowing between the veins first then small brown spots will begin to appear and that will spread into newer but still oldish leaves and on up.

The mobile nutes, NPK, Mg, Zn and I think there's another can be relocated by the plant to where it's needed for growth causing problems with older leaves first. All the rest, mostly micro-nutrients, cause issues with newer growth and are often lacking due to pH issues mainly the pH has got too high locking them from being used by the plants.

An excess of one nute can lock out others so the solution is often complicated to figure out.

As you're 9 weeks into flowering I would not be concerned. With the low temps the best thing you can do to have a happy ending is to get some heat into that tent and don't throw more nutes at it.

Haoleninja86 said:

I'm growing in a 2x4x5 tent outside

Click to expand...

Do you mean you are growing in a tent out doors?