help please.... yellow spots on fan leaves while flowering

[lunarman]

I can't tell what this is. Anyone have any idea on what it could be?

Coco with Remo Nutes incl their calmag, regular optic foliar spray, silica
Last res feed filling was witih PH'd 6 water that is 50/50 tap and RO. Root PH is around 6.2
COB LED lights with some HPS as well. I have a lot of light on this plant so maybe this is light burn.

 

[shalirey]

I can't tell what this is. Anyone have any idea on what it could be?

Coco with Remo Nutes incl their calmag, regular optic foliar spray, silica
Last res feed filling was witih PH'd 6 water that is 50/50 tap and RO. Root PH is around 6.2
COB LED lights with some HPS as well. I have a lot of light on this plant so maybe this is light burn.

Could it be due to lack of ventilation?

 

[namvet25]

How many watts are your lights rated at and what is your distance from the canopy?

 

[lunarman]

How many watts are your lights rated at and what is your distance from the canopy?

Part of a 600 watt HPS. Call it 300 watts HPS. And two 50 watt autocobs as well, so 100 watts of white LED on top of the HPS. All are 24 inches from top of canopy.

I just pulled off one of the autocobs an hour ago because I have another plant ready for a cob. But I've had the 300 watts of HPS and 100 watts of COB on this plant for at least two weeks.

 

[namvet25]

Part of a 600 watt HPS. Call it 300 watts HPS. And two 50 watt autocobs as well, so 100 watts of white LED on top of the HPS. All are 24 inches from top of canopy.

I just pulled off one of the autocobs an hour ago because I have another plant ready for a cob. But I've had the 300 watts of HPS and 100 watts of COB on this plant for at least two weeks.

If your running pure coco the ph should be closer to 5.8.What dosages are you giving of Remo and also dosage of calmag?

 

[Cringer]

Why is the distance to the canopy important? It looks same as mine! Lower the plant it is most green but on top yellow with brown spots. I think you have a Magness deficiency but I am not an expert you in Coco and the Ph is great on soil you need a lower pH first?

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[puggle6]

Imo, looks like a bit of lock out perhaps keeping some of your added calmag from doing it's thing.

Light stress also comes to mind..


f6

 

[Arthur]

Why is the distance to the canopy important? It looks same as mine! Lower the plant it is most green but on top yellow with brown spots. I think you have a Magness deficiency but I am not an expert you in Coco and the Ph is great on soil you need a lower pH first?

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Closer the lights to the canopy (plant canopy) more intense.

SoIL pH is run higher Than coco, or pure hydro, they seem to perform best at around 5.8 soil closer to 6.5.

 

[Heavily Medicated]

I think it's a combination of the foliar spray and the lights. The wet spray on the plants act kind of like a magnifying glass and can give splotchy burns. Make sure your girls are dried off good before hitting them with strong light.