Mg deficiency or Rust fungi!!

[Agoblue97]

Alright lets start by saying i started noticing this on one of my plants about 2 weeks ago. At the time i was give a full dose of FF Grow Big and Big Bloom. I water with R/O water and everything is always buffered to 6.5-6.8 pH. Runoff is 6.2-6.5 pH. Last weekend I up potted everything to 3 gal pots using FFOF with 20% perlite added. Tuesday i noticed that it had moved from just the one plant now to almost all. At first i thought it was a Mg def. so I added Cal-Mag 3 days ago, but now after thinking about it and researching I think i might be rust fungi. My room gets down to about 62-65 F at night and up to about 75-80 during the day. Any info would be helpful, and if it is Mg def. how long after adding Cal-Mag should i start seeing some turn around. By the way it was a 10mL/gal dose.


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Agoblue97 Reviewed by Agoblue97 on 01-06-2011. Mg deficiency or Rust fungi!! Alright lets start by saying i started noticing this on one of my plants about 2 weeks ago. At the time i was give a full dose of FF Grow Big and Big Bloom. I water with R/O water and everything is always buffered to 6.5-6.8 pH. Runoff is 6.2-6.5 pH. Last weekend I up potted everything to 3 gal pots using FFOF with 20% perlite added. Tuesday i noticed that it had moved from just the one plant now to almost all. At first i thought it was a Mg def. so I added Cal-Mag 3 days ago, but now Rating: 5

[WashougalWonder]

This one is kinda tough. I know that RO water will cause a deficiency of all micronutrients not in the potting mix. Once it shows, it is too late. I frequently had that problem when using RO and even though I bolstered with cal/mag the damage was never reversible. IT only seems to get the big leaves and the tips of new growth.

BUT....Rust fungus sounds terrible and I am not positive what it looks like, though similar to what you show. Again, by stopping RO water, just using tap water that set for 24 hours, has eliminated the problem and my temps are lower and humidity higher than most folks this time of year.

For better information, fill out the troubleshooting form.

[Agoblue97]

What is your experience level? Novice outdoors, beginner indoors

Your Equipment:
.1) Type and wattage of lights. 400w Hortilux Blue MH
.2) Distance from tops? 12-18 inches
.3) Reflector type? Enclosed Reflector (YieldMaster II Supreme)
.4) Is there a consistent fresh air supply? Yes
.5) Do you have an exhaust fan and a circulation fan? Yes
.6) What are the bulb wattages, kelvin ratings, and schedule? 400w Hortilux Blue MH, on 18/6

Your medium:
.7) Specific brand and type of soil, and anything you've added to it. Fox Farm Ocean Forest mixed with 20% perlite
.8) Size of container. 3 gal
.9) Did you use peat pucks (or similar) to root clones or germinate seedlings? No

Your nutrients and water:
10) Source of water? R/O What's it's ph before adjusting? around 6.2-6.5 pH
11) Method of checking water ph. Liquid test kit
12) Method of adjusting water ph. pH down and up
13) Specific brand and N-P-K ratio for each bottle. List dosages (quantity per gallon) and current feeding schedule. FF Grow Big 15mL/gal and Big Bloom 20mL/gal, last time was 2 weeks ago, transplanted into 3 gal pots last weekend
14) How often are you watering between feedings, and how much per watering? I water twice between feedings about 2-3 cups each time
15) Any additives or tea's? Cal-Mag 3 days ago incase this is a Mg deficiency
16) Are your ph levels stable, or do they fluctuate? stable
17) What is your ingoing water's ph? ...your runoff ph? ingoing is 6.5-6.8, runoff is 6.2-6.5
18) Do you foliar feed? If so, with what, how often, and at what time do you spray? No

Your growroom:
19) Indoors or outdoors? Indoors
20) What size of closet, room or hut? 4'X4'X7.5'
21) What are the temps and humidity levels while lights are on? ...With lights off? 75-80 F on, 60-65 F off
22) Have you seen signs of insects in the growroom? No

Your strain:
23) What strain are you growing? (Indica dominate or Sativa dom?) White Widow(Sativa), and Himalayan Kush(Indica)
24) From seeds or clones? seeds
25) Is this an autoflower strain? No



That should about cover it, along with the post that started the thread. Any advice or help would be greatly appreciated.
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[Agoblue97]

Here's a couple more pics of leave not as severely affected yet. Hope this helps someone identify the problem.


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[polishpollack]

Have you googled this rust thing? I don't think it's mg def because that usually begins as golden yellow spotting in between the leaf veins. I'm wondering if you've given too much of a fert, but since it's been two weeks since the last dose, it's really hard to tell what's going on here. The damage appears random and brown, like heat damage from lights that are too close, but at 400w at 12-18 inches, I don't think that's it either. It's a tough one. I just did a web search and it looks like fungus can cause brown spotting with leaf curl, which is what you have going on there.

[WashougalWonder]

Ya, I think Mg and OTHER micronutrients are missing. Use some tap water that has offgassed the chloramines and properlly PH'd.

It is not JUST Mg, those micronutrients work together as a team. That is why tap water....not distilled, not RO, tap water.

[Agoblue97]

Alright my course of action will be switching to tap water with Cal-Mag added for about 2 weeks(already bought it might as well use some.), however i do believe my problem to be rust fungi. So have bought some sulfur and plan to build a vaporizer for it in the next day or so. Man that sulfur can really be a pain in the rear end to find. Then I'll run my vaporizer for a couple hours every 4 days or so until I don't see anymore signs of it, then I'll hit it every couple of weeks or so. Forgot to mention I'll be pruning any signs of it from my plants the day after I run the vaporizer for the first time. If anyone has any suggestions or advice I would love to hear it, if not, I'll let everyone know how this goes in about a week or so.:thumbsup::thumbsup:

[canniwhatsis]

Have you seen any signs of growths on the underside of the leaves?


After searching Rust Fungi, you should be seeing something on the bottom of your leaves.

Your effected leaves look similar to what happens to my WW in vege when I over feed..... My blueberry mom did that just a little too when I double dosed her with vege nutes by mistake!

[Agoblue97]

If it was over fert wouldn't I be seeing something on the leaf tips? Man I stay to medicated, lol, but I swear it was on the first plant before I even added the fert. Also I ferted like a week and a half before it showed signs on most plants, but I did transplant a week after. You raise an interesting arguement Canni. You really think 15 mL/gal of Grow Big would've done this after transplanting into FFOF?

[Agoblue97]

Oh and the lights are off right now, but I'm pretty sure it's on the bottoms of the leaves also. If you look up through the bottoms of the leaves you can see it affected in the same spots as the tops. I'll look at it again in the morning when the real lights come on so I can get a better look.