Lets Talk About Rust Fungus & What You Need To Know.

AimAim · Mar 25, 2013

Randm said:
Have you used these products yourself? And what was the results? I do have a bottle of Chlorothalonil based fungacide made by Ortho but have not used it yet. It looks a little scary to me but I am getting desperate enough to try it.

I have used all 4 of these products and this is the order I try them: bordeaux (decades old copper salt) Maneb (Manganese salt) Zineb (Zinc salt) chlorothalonil. I've used them on trees, shrubs, veggies, flowers but admittedly never on something to be smoked. I'd feel pretty safe using the copper, zinc or manganese salts, not sure on chlorothalonil, although it is labeled for use on several human crop foods.

Randm · Mar 25, 2013

AimAim said:
I have used all 4 of these products and this is the order I try them: bordeaux (decades old copper salt) Maneb (Manganese salt) Zineb (Zinc salt) chlorothalonil. I've used them on trees, shrubs, veggies, flowers but admittedly never on something to be smoked. I'd feel pretty safe using the copper, zinc or manganese salts, not sure on chlorothalonil, although it is labeled for use on several human crop foods.

Thanks. As I previously mentioned I am currently using a copper based fungacide with limited results, and am desperately looking for a solution to this. I appreciate your input.

jessica d · Mar 25, 2013

Rancho Cucamonga said:
Cal deficiency and pH issues can be similar looking to this. If leaf is crispy or dry, which usually is the case with Cal def. or pH issue it's not rust fungus. I have a few leaves that look like this in most my grows and they tend to be near the bottom and it has never spread.

ya and spraying plants with alot of stuff. ph swings as well. r/o water has dramatic swings with no micros.

VX420 · Mar 26, 2013

Th op post says its a brown powder,, is it a brown powder on your plants, or dead brown leaf?

Monkeymonk840 · Apr 12, 2013

VX420 said:
Th op post says its a brown powder,, is it a brown powder on your plants, or dead brown leaf?

I believe it starts as brown spots and curled leaves. But eventually u notice brown dust on leaves and stems. I had it bad. It spreads like mad. I tried neem and some others but just burning sulphur has killed the spores and it seems the fungus totally. I then added benes and waited for dead leaves and stripped them off. I repotted and let grow out. I took new cuts and they all seem good. Even the originals look good now. I'm finding a dead spot here and there but I think from the water touching the sulphur treated plants is why. But I will soon see here in flower if I get any bud mold. That's another symptom. Sulphur changes the surface ph of leaves and plant matter to make it uninhabitable for the fungus. It's works very well for powdery mildew I've heard.

sophrie87 · Jun 3, 2013

Is this rust fungus? It's a white widow, in Organics Mechanics Seed Starting Blend. (in two stacked solo cups lol) under an iPower 600W HPS about 3 feet away. I feed it about a shot of distilled water every other day. Good drainage. I know my temps are high... around 90 mostly. I can get it as low as 84ish. Is this a huge problem? I have 3 other plants. 2 skunks #1 , and a white domina growing just fine next it. Although, I think I'm getting some stunted growth, one of my skunks is 3 weeks old and only about 5in tall. Acceptable? ~First time grower, any feedback is very appreciated.

Thanks!

jessica d · Aug 2, 2013

Monkeymonk840 said:
I believe it starts as brown spots and curled leaves. But eventually u notice brown dust on leaves and stems. I had it bad. It spreads like mad. I tried neem and some others but just burning sulphur has killed the spores and it seems the fungus totally. I then added benes and waited for dead leaves and stripped them off. I repotted and let grow out. I took new cuts and they all seem good. Even the originals look good now. I'm finding a dead spot here and there but I think from the water touching the sulphur treated plants is why. But I will soon see here in flower if I get any bud mold. That's another symptom. Sulphur changes the surface ph of leaves and plant matter to make it uninhabitable for the fungus. It's works very well for powdery mildew I've heard.

how often do you burn? did they flower out yet?

doniawon · Aug 2, 2013

Rust fungs is a brownish sticky pwder like powder mildew but gold or brown

The ops pic is necrosis from nutrient diffenciency

doniawon · Aug 2, 2013

Not one pic in this thread is rust fungus. I've had it once in 15 years. Kinda rare. That's why there aren't any threads about it.

jessica d · Aug 4, 2013

seems kinda rare and difficult to diagnose and treat. i got it atm and hard to deal with 70 5-8ft plants. i am short 70 plants for meds but dont want to mother it forever. sulphur burns are working best and spraying anything makes it worse. trees, grass are filled with it in my area. many growers have it and never know it but many confuse with calmag or micros + bugs.

jessica d · Aug 4, 2013

1 spot on one leaf from the air or rain slowly travels from bottom of plant up. then to plant beside it and gains speed especially with rain or wind and touching the plant with hands or clothes. i can show a transition in pics but they take forever to load em .

Monkeymonk840 · Aug 11, 2013

This is the first sign of a rust fungus. Note the leaf curl, and u will see a brown dust on leaves when it gets airborne, and from there will kill ur tops and the whole plant. Jessica I'd say ur not getting enough light in spots and need to clean that up a bit and pull off dead material. And give em some molasses I'd try. If u notice leaf curl and such u have two options. Kill everything, or spray with eagle 20 in veg, or burn sulphur in flower. I'd burn sulphur for 3 hour bursts weekly or bi weekly to kill it then monthly as a preventative. But if ur running old cuts like some I have like the exodus psychosis, it's immune system is getting tired in its age a bit and I had to use eagle 20 to kill it. It's really really bad.

Monkeymonk840 · Feb 3, 2014

Ps found out awhile back that it is actually a living creature, that resembles a fungus aka the worst garden pest, the rust mite aka the russet mite. Avid at 5ml per gallon with azamax at 60ml per gallon will wipe them out in a few sprayings. Just spray everything well, use up all the liquid and clean, clean, clean. They can lay dormant for awhile, even live on bud I've heard or carpets for months. So be regimental for 6 months, once a month after spraying for three days in a row the first two weeks after diagnosing. Good luck, I got rid of mine. So they are possible to eliminate with this recipe.

Greensea · Feb 3, 2014

Think my last grow was infested by this...??

calisoil · Aug 25, 2014

Think i have the same problem atm but is killing the buds that dont get direct light. Slowly killing its way up the plant. Thought it was a root issue, like pithium at first due too thrips, but am starting to think otherwise. Brown dust on the top hairs have died and no growth. Stems weaken also. Ill upload some pics once im home.

DazDanky · Apr 29, 2015

I'm pretty sure I have rust fungus can anyone confirm

Dr. Who · Apr 30, 2015

doniawon said:
Rust fungs is a brownish sticky pwder like powder mildew but gold or brown

The ops pic is necrosis from nutrient diffenciency

doniawon said:
Not one pic in this thread is rust fungus. I've had it once in 15 years. Kinda rare. That's why there aren't any threads about it.

READ the above again!

Rust Fungus,,,,,,shit, now we're going to have a mass infection of novice growers by hypochondriac internet contact association syndrome.

Same damn thing happens every time someone brings up Sunn/Hemp or Tobacco mosaic virus!!!

tip - o - the hat to doniawon! (Where's that damned + rep when you really want it.....LOL)

Doc

chickenthr33 · May 11, 2015

I have the same issue, and the thing that makes me think it may be a fungus is that the part of the leaf that dies has little specks on it that look like spores to me, I'll try and get a close up pic but I dunno if my camera will pick it up. However, if it's really a rust that is supposed to rub off on your fingers when rubbed, I haven't seen that at all, they are dead spots not anything like a powdery mildew that you can rub off.

Mistress420 · Jul 30, 2015

doniawon said:
Not one pic in this thread is rust fungus. I've had it once in 15 years. Kinda rare. That's why there aren't any threads about it.

thank you for your input i have the issue in the first pic, thought it was nutrient lockout. I received my plants earlier than expected and still need to pic some things up like ph stuff; the pic had me worried this was my prob i was about to hack the leaves off even though my room is well vented and proper temp simply because the pic was exactly like mine
thank you =) you we're a big help

FragglenMogo · Sep 22, 2016

Hi guys just came across this thread in a search to find out what my plants have i thought it was a mould of some thought im a first time grower plants are 2 weeks from being ready and 2 days ago i could smell wet grass upon entering grow room will upload few pics if anyone can help me out id appreciate it

Lets Talk About Rust Fungus & What You Need To Know.

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