Rust spots on leaves

[Giddy420Guy]

I seem to have a couple fan leaves that have developed these spots. It is only on some of the older leaves and lower down on the plant. This is an autoflower that is just heading into flower but has not yet started to develope any hairs yet. She is growing in coco with a bit of worm castings and about 10% perlite. She is in amended soil using Giah Green grow and is being fed dechlorniated water at a PH of 6.7-6.8. She is one of 4 plants and is the only one that has developed these spots. Any suggestions or help on what this is or what has caused these couple leafs to turn funny would be greatly appreciated. Thank you.

 

[Bill284]

I seem to have a couple fan leaves that have developed these spots. It is only on some of the older leaves and lower down on the plant. This is an autoflower that is just heading into flower but has not yet started to develope any hairs yet. She is growing in coco with a bit of worm castings and about 10% perlite. She is in amended soil using Giah Green grow and is being fed dechlorniated water at a PH of 6.7-6.8. She is one of 4 plants and is the only one that has developed these spots. Any suggestions or help on what this is or what has caused these couple leafs to turn funny would be greatly appreciated. Thank you.

Hey giddy welcome to 420. If your growing in coco you should be trying to keep your ph as close to 5.8 as you can, she isn't eating properly imo. Let's see what others have to say.

 

[odinsmaster]

Definitely need to fix your ph. In coco I run at least 30% perlite in my mothers. You also have to add calmag when growing in coco.

 

[Giddy420Guy]

I completely agree with running a lower PH in coco, this is what I did while running General Organics. I am currently using Giah Green dry amendments at a rate of 3 Tbls per gallon of coco and then top dressing every four weeks. With this feeding I keep the PH at 6.8 and have absolutely fantastic results. Of all the plants I have going right now this is the only one that developed these spots, at that it was 3, maybe four leaves that look like this. I pulled the leaves off while I was cleaning her up before she went into flower and could not figure out what could have caused this to happen. Other than these couple leaves she is in perfect health. As stated before, with the Giah Green and a 6.8 PH I have pulled down the largest plants and best weights of my life and been able to produce top quality meds for both myself and my wife.

 

[Giddy420Guy]

Bump

 

[MochaBud]

@Giddy420Guy

As said ^^^^ you really need to lower the PH...back when I actually PHed my water/feed for soil it was @6.3 PH so it could rise through the levels and get proper uptake...even further back, when I grew in coco coir, I PHed @5.5, and fed small amounts of nutrients with cal-mag every day till runoff...

 

[NuttyProfessor]

Sometimes the lower leaves hang in the soil /coco when sleeping , then these marks appear and you say hmmm what happened here , even sometimes they touch the sides of FABRIC pots and gets strange marks , as long as its not spreading its old news
I would ph at 6.4 for change of menu