Light green spots near stems brown in centre

[Camer41]

Hello all
Here is a picture of a young plant that I have growing in coco. I’ve been ph ing since the very beginning with a good quality light source. Temps are around 77 and 40-50% RH. This plant is about 2.5 weeks old. I just started feeding her at a very low 1/4 strength. Water run off is at 6.2ph. I noticed this issue when the plant was really young and the first set of small true leaves came. It seems to be concentrated near the stems as you can see then less as the leafs grow out. Any help would be amazing. Thank you everyone ! Oh I also see no signs of mites or bugs looking through the jewellers scope. You can also see dust and or coco dust on the leaves this is just because I recently transplanted the issues were there before the transplant

 

[The Phantom]

I’m trying to see if the little brown/black specks on the leaves could be spider mites, just some dust from the coco you’re growing in, or a combination of the two. Take a look at this Cannabis Plant and Pest Problem Solver - Pictorial, scroll about halfway down to the pest section and look at the enlarged photo of the spider mites to verify if that’s what you see on your leaves.

 

[Camer41]

I’m trying to see if the little brown/black specks on the leaves could be spider mites, just some dust from the coco you’re growing in, or a combination of the two. Take a look at this Cannabis Plant and Pest Problem Solver - Pictorial, scroll about halfway down to the pest section and look at the enlarged photo of the spider mites to verify if that’s what you see on your leaves.

I had a very close look using my dissecting microscope and all I could find is dust. Have a look do you see anything I missed? Photos are okay not perfect

 

[The Phantom]

Nice photos and very helpful, I’m glad to not see any mites hanging around.

I’m not a coco grower and my knowledge is pretty limited on it but I do know a little. You’ve just started feeding, have you also been using a cal/mag supplement as well?

 

[Camer41]

Nice photos and very helpful, I’m glad to not see any mites hanging around.

I’m not a coco grower and my knowledge is pretty limited on it but I do know a little. You’ve just started feeding, have you also been using a cal/mag supplement as well?

I have just started using medi 1 which has cal and mag in it among other things. Do you think a shot of cal mag on top of the regular feeding would help?

 

[The Phantom]

I do know coco is pretty demanding for cal/mag. Did you buffer your coco with cal/mag before planting?

 

[Camer41]

I do know coco is pretty demanding for cal/mag. Did you buffer your coco with cal/mag before planting?

Hmmmm I did not. I’m only using liquid nutrients. Do you mean run some cal mag solution through the medium before planting ?

 

[Camer41]

Hmmmm I did not. I’m only using liquid nutrients. Do you mean run some cal mag solution through the medium before planting ?

It is prebuffered.

 

[The Phantom]

Yes, check out this thread on it: Buffering Up: Adjusting the Cation Exchange Capacity in Coco Growing Media

Hopefully someone a little more knowledgeable on the subject swings by in the am to help you out.

 

[The Phantom]

It is prebuffered.

That’s good news.

Edit:
So to help out those with better expertise than myself that come by to offer help I would post what you’ve been using for nutrients and how much. My guess is you’ll get comments on only using 1/4 strength nutrients and needing a cal/mag supplement if your current nutrients don’t contain enough.

I’ll check in tomorrow morning and see if you’ve received and help or not and at least bump the thread back up to the top of the pile for you. If you decide to start a journal make sure to tag me so I can follow along.

Also I just saw in your original post that you did say it was coco dust, sorry for not catching that sooner.

 

[The Phantom]

@Camer41 could you share a little info on the nutrients you’re using and the dosage?

Thanks

 

[Camer41]

@Camer41 could you share a little info on the nutrients you’re using and the dosage?

Thanks

Hello I’m using green planet - the medi one kit. It has one base nute and 4 other additives. Hope this helps

 

[The Phantom]

It sure does help. I’m going to stick with my thought of not having enough cal/mag for being in coco. I see that Green Planet carries a Pro Cal supplement you could use with a low nitrogen content. There are some other cal/mag supplements other members use with low nitrogen content but I can’t recall any names. I made the mistake and bought a cal/mag supplement that has a lot of nitrogen in it, so I have to be really careful using it.

 

[Camer41]

It sure does help. I’m going to stick with my thought of not having enough cal/mag for being in coco. I see that Green Planet carries a Pro Cal supplement you could use with a low nitrogen content. There are some other cal/mag supplements other members use with low nitrogen content but I can’t recall any names. I made the mistake and bought a cal/mag supplement that has a lot of nitrogen in it, so I have to be really careful using it.

Hey there thanks. I just picked up some cal mag with a 1-0-0 fert profile. Going to add it and I’ll send an update. Thanks for the info greatly appreciated

 

[Camer41]

Update. After adding cal mag at 25% strength then 100% strength over 5 days the new growth is no longer showing any signs of deficiency or issues in general. I realized I should of started fertilizing the seedlings sooner I waited too long. Here is a pic of the new healthy (slightly N deficient) growth. They should darken up a bit in a few days after the full round of 1 part medi one nutes grabs hold.