I’ve had problems that look just like this recently too and Instead of using calmag I used epsom salt at 1 tsp per gallon and put the ph lower to 5.5 to 5.6 instead of 5.8. I’m growing in coco so it could be a little different. My new leaves haven’t had any new brown spots.
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Whatch the new growth whatever leaves that had any damage at all will likely look worse as it’s the damage is already done if it is cal-mag and you added some it will take a few days but all new growth should look good and I would take off the badly damaged leaves once healthy I remove any damaged leaves as plenty more will replace them… @cmichphoto
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I found this hope it helps
So last night we threw in a sulfur burner and set the ventilation and fans to turn off while the sulfur burned for 4 hours during the night cycle. We’re going to repeat this step one more time tonight, just to make sure that we covered every centimeter of our room.
Then tomorrow we’re going to flush all of our reservoirs and start with fresh nutes.
Once we get everything flushed, we’ll be adding a batch of 10 healthy teens into our third system.
We bought Safer Brand 3-in-1 spray, that has sulfur inside of it, to keep the PH of the leaves at unlivable levels for fungus. We’ll be maintain things with that spray. Then maybe about once per week, we’ll be doing a sulfur burn.
We’ll also be installing a new filter on our intake, one that will better filter out fungi and other bacteria.
After that… all we can really do is sit with our fingers crossed.
never had that kinda thing all over my stuff either, i hope what your doing works, and if it does let us know, incase i get this in the future, it would be nice to know what to do 
Sux your like the pioneer ;X
i aint never had that problem before.i hope what your doing works.let us know.
We’re starting to see some improvements. We also added some new plants to the room a few days ago… and these ones dont seem to be catching the fungus. Sulfur burner seems to be working.
Is all of the leaves. From the bottom to the top. My ppm’s werent over 1000. Not way it could have been nute burn.
Yup… the sulfur burner is working. We’ve ran it two times and are running it again tonight. We also increased our PPM in our reservoirs. The old PPM was too low for such big plants. Its only been a few days and already we’re seeing a ton of new and healthy growth.
We actually changed out all of our reservoirs and increased the amount of nutes. Our PPM was under 1,000. Now we’re up around 1,300 - 1,400 ppm. The nutes had nothing to do with it. We’ve ran a sulfur burner 2 times and our plants are already showing healthy new growth. It was an airborne fungus. I’ve been growing for much to long to burn my plants with nutes. I do appreciate your help though.
Im running hydro. Thats what the buckets with those little rocks in them are. I would never run for 7 days with no nutes during veg. It only takes a few hours to flush hydro with a flushing agent.
It was Rust Fungus. We actually increased our PPM and the plants are already showing a ton of new growth. The sulfur burner is what fixed this issue, by killing the airborne spores and changing the ph of the leaves, to make them unlivable for fungus.
Well… that looked to be the problem. Rust Fungus… if you want to get rid of it… buy or make your own sulfur burner. We tried about 4-5 different Fungicide sprays and all they did was seem to make it worse because it added moisture to something that thrives on moisture. Sulfur burners surround your plants with a dry smokey vapor of sulfur that kills and prevent fungus, while also eliminating most bugs. Get rid of all of those sprays and get a sulfur
Appreciate the update on your issue mmrcgrower, even after little to no help from other members. And worst of all, their attempts at misinformation. I’ve been reading dozens of posts and I’m tired of seeing self proclaimed experts automatically say “oh! It’s a mg def! Oh it’s a cal def! Oh it’s nute burn!” get your facts straight ppl and stop encouraging ppl to buy products and waste their time off of a whim you had. So annoying.
Anyway, do u have any links on how to make your own sulfer burner? Are they expensive and where to purchase them? Thank u for sharing your results with the rest of us. Much appreciated.
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Here is another pic and I found more on it hope it helps
Will
What Is Rust Fungus?
Rusts are plant diseases caused by pathogenic fungi of the order Pucciniales(previously also known as Uredinales). About 7800 species are known. Rusts can affect a variety of plants; leaves, stems, fruits and seeds. Rust is most commonly seen as coloured powder, composed off tiny aeciospores which land on vegetation producing pustules, or uredia, that form on the lower surfaces.
How Does It Spread Infection?
The main cause for Rust is night time temperatures being too cold with a high humidity.
Rust fungus produce asexual spores which are spread like wildfire by water, wind or bugs. Pathogenic fungi are biotrophs meaning they take the nutrients they need directly from the plants cell tissue. Once the spores settle on a plant hydrophobic interactions are formed on the plants cell surface through a process that isn’t fully understood yet the Rust fungus produces a sticky like substances which attaches the spore to the plant. Once attached to a host plant the Rust fungus spores germinate by growing a “germ tube” eventually reaching a stoma, once inside the hyphae tips flatten out to lock into cell walls. A “peg” then grows into the plants mesophyll cells its creates specialised tips “Haustorium”, they spread around cells without affecting the membranes. The plants membranes invaginate around the haustorial forming a open space. Iron & phosphrous rich neck bands connect the plant and fungi known as apoplast which prevent nutrients from reaching the plants cells, its grows until its produces new spores which is repeated every 10-14 days.
Prevention.
Currently there are 2 or 3 types of Pathogenic fungi which are resistant to sterilization. (Bleach washes, Sulphur Candles, Soapy washes etc.). One of the best preventions you can take in your grow room is to have proper temperature, ventilation and always disinfect your room after every grow. Spraying plants 1 or 2 a week with some kind of fungicide (I prefer Sulphur based) is also great since it reduces the changes of spore germination.
Cure
Its extremely hard to get rid of once you got it most fungicides with help slow it down but not kill it completely. At this time the only way to cure a plant once Rust fungi has gotten hold is with Systemic fungicide which runs through the plants cells killing any fungi it comes into contact with, which also can be bad since it will kill helpful fungi as well. Any infected plant material should be burnt or put in a garbage bin outside of the home as composting and leaving it a normal garbage will just spread the infection more.
If you think you noticed Rust fungi act right away because the more time it has to establish the harder it is to get rid of!
Thanks for reading!
I recently decided to write this after I was hit a Rust fungi attack in my last grow. At first I thought it was a Mag/Cal as I experienced the same symptoms yellowing drooping leaves, browning at tips and edges etc. So I do what I normally do hit them with some Epsom salts/Egg shells which usually works like a charm to my surprise 2 days later they looked even worse so I gave them some Epsom again and samething. So I headed on over to Google and RIU of course trying to figure out what it was threads/links I could find suggested that it was just a Cal/Mag deficiency but I thought other-wise, so after browsing the net for 2 days I actually come across a forum about Rust fungi and boom thats what I had there was next to no information about. So I wrote this hoping it would provide easy/more information about the Rust fungi & Marijuana and open some more eyes, as I’ve seen self proclaimed experts mislead people saying its Cal/Mag deficiency, when its really Rust fungi.
If you rub this fungus will it come off on your fingers? Some of your pics look somewhat similar to the problem I’m having but not exact.
If you rub this fungus will it come off on your fingers? Some of your pics look somewhat similar to the problem I’m having but not exact.
From what i’ve noticed no it doesn’t rub off on your hands, but the spores could be to small to feel so it could quite be rubbing off just im not realizing it.
I have something that looks like the pictures posted above. Of 4 plants, 2 have a severe case, one not so bad and the forth (a different strain,) not at all. They share a tent and overlap and contact each other. I can not get rid of it, but the flower production looks ok. Once infected, the leaves live for awhile, but eventually start to get crisp and die. I am starting to cut the bad leaves when they start curling. The other symptom that is also distressing is that the plants are stunted. I am trying to nurse them along till harvest. 7 weeks of veg and 4 weeks of flower is too much to give up on. The good news is that the 4th plant looks like it should be on the cover of a magazine.
wow ive had this problem before also and mistaked it for cal-mag. thanks
same here man i thought mine was a cal mag too
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Thanks so much for the tips from your experience. Never had any issues with a second floor grow in the Spring, but a Winter grow in the cellar in Massachusetts, well it is truly a wonder to behold.(pun intended).
Still fighting fungus gnats after two months and multiple techniques. I am using this forum as a guideline, and so far the only bad info that almost took out my five Purple Haze was the Cinnamon oil and ground cinnamon on the soil. That just about did them in, and I always thought the brown streaks and spots were from that treatment. Just pulled the last of the brown spotted/streaked leaves and then dusted with 99% sulfur. Did a heavy coat, and then shook them enough to spread it around. Will leave them alone till next watering. Thank you all for your input, and experiences. Hoping I can get these gals into fruiting mode by March. The growth has been stunted from the damn gnats. Has been the most costly batch so far. Hope it ROCKS!
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Just wanted to thank you…it was indeed rust fungus. I found a product from Safer, Garden Fungicide w/sulfur that took care of the problem very easily. The girls are now looking healthy and growing like a weed. 
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