Yellow spots on leafs.

**Jake hammer** · 25-01-23, 10:17 PM

I'm growing 5 autos.
3 zkittlez and 2 xxl critical bcn.
On the 3 zkittlez on the lower leafs I'm seeing yellow spots.
I've pruned them off and attached pics.
I can't see any bugs at all on the top or bottom of the leafs.
And it dosent seem like mold either. The spots don't rub off in your fingers.
It's only currently on the skittlez and not affected the other 2 at all.
The plants are just over 3 weeks old in coco and I'm feeding nano 0.9 nutes under hps lights 24/7.

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Any ideas please?.

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**Jake hammer** · 25-01-23, 10:35 PM

My ec out the tap is 0.7 and pH around 7.4.
Im currently feeding at 1.3 ec and pH to around 5.7 to 6.1.

**Bud Lightyear** · 25-01-23, 10:39 PM

You have Nano coco base nutes A & B right ? What pH and Ec are you feeding and how often, what size pots ?

Regards BL

**Jake hammer** · 25-01-23, 11:35 PM

Originally Posted by Bud Lightyear

You have Nano coco base nutes A & B right ? What pH and Ec are you feeding and how often, what size pots ?

Regards BL

Nano a and b and root. PH 5.7 to 6.1 and Ec 1.3. Pot size 12l I think.

**Bud Lightyear** · 25-01-23, 11:44 PM

Originally Posted by Jake hammer

Nano a and b and root. PH 5.7 to 6.1 and Ec 1.3. Pot size 12l I think.

How often you feed/water ? What volume Litres per pot ?

Regards BL

**Jake hammer** · 26-01-23, 12:48 AM

Originally Posted by Bud Lightyear

How often you feed/water ? What volume Litres per pot ?

Regards BL

I water everyday till a slight run off.
I've checked the ec of the runoff it's not got a high buildup.

**Bud Lightyear** · 26-01-23, 01:00 AM

Originally Posted by Jake hammer

I water everyday till a slight run off.
I've checked the ec of the runoff it's not got a high buildup.

I always water/feed in coco with 15 to 20% runoff this helps to flush any stagnant unused elements in the medium preventing salts build up whilst passing fresh oxygenated nutrients through root system...Best thing to do now is flush the pots with 3 x the pot size volume with plain water, this will reset the medium...Once the pots have stopped dripping you can administer a fresh feed...Equal amounts of A & B to an Ec of 1.4 and adjust the pH to 5.8..2 litres per pot..

Regards BL

**mpsj** · 26-01-23, 03:28 AM

Originally Posted by Jake hammer

I'm growing 5 autos.
3 zkittlez and 2 xxl critical bcn.
On the 3 zkittlez on the lower leafs I'm seeing yellow spots.
I've pruned them off and attached pics.
I can't see any bugs at all on the top or bottom of the leafs.
And it dosent seem like mold either. The spots don't rub off in your fingers.
It's only currently on the skittlez and not affected the other 2 at all.
The plants are just over 3 weeks old in coco and I'm feeding nano 0.9 nutes under hps lights 24/7.

Any ideas please?.

Just as an observation, the top pics look like a P def and the spotted one perhaps a Ca def. Those are just my ideas.

**Jake hammer** · 26-01-23, 03:33 AM

Originally Posted by mpsj

Just as an observation, the top pics look like a P def and the spotted one perhaps a Ca def. Those are just my ideas.

I been looking online and was thinking that.
With the nutes I use you don't add calmag.
So was thinking start adding small amounts maybe.?

**mpsj** · 26-01-23, 04:26 AM

Originally Posted by Jake hammer

I been looking online and was thinking that.
With the nutes I use you don't add calmag.
So was thinking start adding small amounts maybe.?

I'm not familiar with the nutes you are using, so perhaps someone else could offer advice on how to add supplements. I add a small amount of CalMag with every feed...but that's just the way I have my nutes delivered.