Rust spots on leaves

[buzzer]

I have a handfull of leaves lower and top of plant starting to get some rust spots.

 

Looks like it could be a manganese deficiency. Anyone had this before? how did you fix it?

 

I'm aware of the slight nute burn on the tips. EC has been dropped and the plants look very healthy in general.

 

Cheers

 

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[OldManDallas]

Looks like your leafs are wet too, more air flow and don't water the foliage any more will help

[buzzer]

yeah that photo was taken right after I folair sprayed and the lights went off.

 

been thinking I should stop cause I'm about 4 weeks into flower

 

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[buzzer]

Looks like the best way to correct it is feed at a lower pH.

 

My res has been around 6.2 and the upper threshold for manganese uptake is 6.0

 

Anybody else corrected this problem by dropping PH under 6?

 

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[OldManDallas]

Yer I wouldn't foliage spray this long into flower as it can lead to bud rot also, maybe cut a few big fan leaves off to help air flow as well.

[buzzer]

Cheers [emoji106]

 

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[buzzo]

I can see why you would think its a Micro Problem. I think it's more likely low on Potassium.

The reason I think it's potassium is because the of the Tips. I don't think that's Nutrient Burn at all, judging by the overall color of the Leaf

What medium are you using?

[buzzer]

Thanks for the reply Buzzo

 

I'm using Coco. That yellowing is only on a few of the top leaves that are closest to the light. I just raised up the light because I thought it might be light burn. The tip browning is pretty much over all across both plants. I dropped my feed pH to 5.6 last night to try and correct the possible manganese lockout.

 

I'm watering at 1.6 EC and 6.2ph before last night adjustment. I'm using biodiesel Green Diamond base nutes with the biodiesel flower stim.

 

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should I add a little potash?

 

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[buzzer]

The tip burn showed up about a week before the rust spots

 

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[buzzer]

I've got the Rhino K which is the biodiesel potassium booster. Going by the feed chart it says to add it during the last 3 weeks of flower.

 

These are autos. At about week 7-8 from seed. Do you think I should be bringing in the K earlier than suggested by their feed chart?

 

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