Rust?

[Guest]

That's what it appears to be but still doing research. I can't find anything on ic and general internet research has not been helpful.

Any help would be greatly appreciated.

 

[five0addict]

is your soil magnetic?
lol idk

 

[pieceofmyheart]

Ya know what my man Tom petty says, "if you don't run you'll rust"

j/k too heehee

 

[Core]

rust on your doorknob.....?....cmon man explain a little more...how you expect we can help you if we dont even know what you talking about

 

[Blunt Trauma]

The first thing that needs to be said here is..... rust is pretty uncommon. Do you have the ability to show pics?

My crop got rust before. Not as funny as is sounds either. If, in fact, you do have rust, you need to: 1: REMOVE ALL AFFECTED LEAVES, 2: increase your air flow and drop the relative humidity, dehumidifier. 3. Treat regularly with a sulfa based anti fungal every three days for two weeks or until rust is gone.

Rust causes massive leaf drop and rust like spots on the leaves that turn dry and brittle, and it spreads like wildfire. If you have plants that are unaffected, watch them closely.... treat them anyway ...

When I treated my rust problem I lost almost everything. It may have been a better decision to scrap that grow and start over since it was early in the cycle. You have to make your own call on that. Whatever you do, be SURE you're treating the right ailment before you treat. Some products can rape your plants.

 

[sproutco]

Responsible for many of our worst crop diseases, Rust is caused by one of three microorganisms. Aecidium cannabis, Uredo kriegeriana, and Uromyces inconspicuous are the fungi in question, and they have been described as coming from a single spore state. Each represents a different stage of the Rust life cycle (aecia, uredia, and telia), so they could be different spore states of the same organism.

Characterized by spots on the underside of lower leaves, yellow, ochre, or orange in color, true Rust should not be confused with "white rust," which is related to Downy Mildew. To control Rust, careful pruning might be sufficient. Sulfur helps, if one carefully dusts the underside of leaves. (maybe liquid would be easier)

Rust is most common on mature plants in the fall. This fungus prefers a cooler temperature and higher than normal humidity. It is spread by the wind-outdoors, or by people and implements-indoors.

http://forum.cannabis-seeds.cc/index.php?showtopic=1100

.

 

[Blunt Trauma]

yeah...what he said.

 

[Guest]

rust on your doorknob.....?....cmon man explain a little more...how you expect we can help you if we dont even know what you talking about

Ooooops...guess I was just a wee bit vague...eh? Sorry man but my camera needs replacement and it's low on my priority list. Figured if someone dealt with it before they could hep out. It was late and I was tired when posting. Anyway...My friend who lost a crop to rust last year and FAST, said it was super nasty like you described Blunt. She was the one who said 'rust!' so I just assumed.

I did some basic online research after the diagnosis and was not happy with what I found...nasty stuff for sure. Seems like only treatment is removing leaves and sulphur so thanx for the confirmation Blunt. All apparently affected leaves were trimmed at the start of the light cycle. There was no progression at the end of the cycle. I checked humidity (under 40% max), airflow (exchange approx every 1 minute) and it's been freezing cold outside for a few weeks. I was a little baffled.

I checked res pH, it was just changed, and it was like 5+...ouch...the city's water seems to have always been rock solid for the last few years so I only do infrequent testing now. Got my nute program nailed so know what the pH is without testing and do regular res changes. Seems like the water pH dropped substantially recently. Problem showed up on two plants (rockwool slab system) and seemed to be some of the weaker ones in the room. I made adjustments and will see tonight when I open things up.

Call me Chicken Little...'The sky is falling!'. Sorry y'all but seems like a false alarm but thanx for the responses. If it's rust I'm screwed cause I'm 3 weeks into flower and no way to treat with sulphur.

Thanx Sproutco for that info...seems like not much info on the net about it in regards to cannabis.

 

[MTF-Sandman]

Sounds like it may just be a little lockout from the PH issues to me...

 

[Core]

Ooooops...guess I was just a wee bit vague...eh?

just a tad .....lol..just like 2 know what it is...always ready 2 learn ...and be prepared...

 

[Guest]

Sounds like it may just be a little lockout from the PH issues to me...

After doing some research and taking some measurements that's what it seems, and I'm hoping, to be. Another thing was the inline filter, which was just cleaned along with the res change, was plugged pretty badly from rockwool detritus and nutrient solution flow was pretty weak.

 

[Guest]

Shit...pH stuff...wish I could tell you why the city's water pH has dropped about .5 in the space of a week or so after being rock solid at about 7 for the last few years, from what I've now learned, but you could then pin me on a map. Even though I'm med I ain't gonna wave a flag.

 

[Pops]

Every time I masterbate, i blow rust. Do you think it's PH lockout, old age or my nutrients? Come on ,sproutco, give me a hint. (j/k)

You are lucky, the ph of my water runs around 8.5.

 

[Guest]

I really didnt want to hear that MJ "Rust" Being in the Grass Seed Capitol of the World, Rust is flying rampant through the air in the spring.

Before you prune. Spray down the affected area. Wouldnt want to go spreading the spores on the wind and making your problem worse.

 

[sproutco]

"Rust" = probably metals in the leaf. Check that ph has not gotten too low.

 

[Guest]

Sproutco...rust seems to be a real thing with cannabis but is encountered very, very rarely. There's info on the background of this stuation I wish was postable but...the legal enviro prohibits this. I'm really beginning to wonder if the orginator of the 'rust' scare in the area was kind of clueless. Interesting thing is peeps growing the same strain experienced the same thing at the same time in the general geographic area. This grower, over 20 years, who ran in Europe and the US said RUST, bought a sulphur burner to 'clear' the room after the loss which occurred over a few days. Prollem is they, all the peeps, were running the same strain from clone over an extended period soooo...I don't think what everyone saw was rust but a clone that degraded and everyone expereinced some weakness at the same time. Don't know if that makes sense but like your input. Seems like when you post stuff peeps rip you apart...thanx for your help bro . Keep an open mind man :wink:.

 

[sproutco]

If you got rust, you should be able to rub the rust spores off the plant with your finger. Not just rust looking spots. Rust fungus interestingly may have 2 hosts. 1 stage or more of the fungus lives on another plant and then another stage depends on another plant to live. See hawthorn rust for an example. Google that. Oak trees also serve as a host to one stage of a rust fungus. The price of coffee in the grocery store is high because of rust.

i have a high degree of fungus knowledge.

http://www.extension.iastate.edu/Pages/plantpath/hawrust.html

 

[Verite]

i have a high degree of fungus knowledge.

So how much of that is related to growing marijuana?

 

[Guest]

Thanx again Sproutco. I did more research and found pics of non cannabis plants affected with rust and you can easily see pustules. What I saw a few days was not rust. pH correction immediately took care of the problem. Seems like rust has been an intersting topic of conversation though.

 

[Guest]

Quite interesting to me. Glad to hear that it wasnt rust. I know what rust can do to other crops. Couldnt imagine what unchecked rust would do to a MJ crop