DWC Rusting on top leaves - need help!

Fhawila · Tuesday at 6:22 AM

Hi guys ,

I’m running Mills nutrients - plants are particularly big as needed them to stabilise before flipping.
1.7-2 EC
PH 5.8-6
600 uMol Quantum Led
66 F Water temp
73 F Ambient Temp
50% RH
1200 PPM CO2

Some plant leaves are showing these rust spots on them, I supplemented low dose Athena Calmag but hasn’t solved 100% - any thoughts are very welcome!

Mr. Mohaskey · Wednesday at 6:50 PM

Raise your ambient "light on" temp to at least 82f, with co2 I'd say 84-86 would be good. 73f for lights off is good. Lower your EC to about 1.2-1.4 for a little while. RH should be raised to about 60% under the conditions I just specified.

Edit: you using Epsom salts? What nutes are you using?

Mr. Mohaskey · 2025-05-15T07:53:18-0600

Mr. Mohaskey said:
Raise your ambient "light on" temp to at least 82f, with co2 I'd say 84-86 would be good. 73f for lights off is good. Lower your EC to about 1.2-1.4 for a little while. RH should be raised to about 60% under the conditions I just specified.

Edit: you using Epsom salts? What nutes are you using?

Just reread the post and saw Mills nutes. I am not familiar with them so cannot comment on that.

Fhawila · 2025-05-15T07:56:24-0600

Mr. Mohaskey said:
Just reread the post and saw Mills nutes. I am not familiar with them so cannot comment on that.

thanks for your help .
i will raise the day temp (has been on my mind)
EC is currently at 2.2 will lower for a bit but doesn’t look like nutrient burn so much looks like calmag deficiency. i’m trying to grow 5 different strains so that’s not helping…

RH i’m worried about raising to 60% due to mildew mold which i’ve had before (am in costa rica)

DWC Rusting on top leaves - need help!

Fhawila

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