PM need help please

curious2garden

curious2garden

Well-Known Mod
Staff member
Thegermling said:
Ive heard that stuff can kill PM. Ive never used it though, too expensive. I used Procidic2 (ask for a free sample, its huge for small growers) on a plant that had PM and its gone. I saw one leaf starting to have white powder and made a solution and dapped affected leaves with a qtip and the pm hasnt come back. It can also be used as a root drench and I did and I never saw pm again. It can be used for bud rot but nah I never spray flowers.
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It allowed me to reach harvest with a Bodhi Lucky Charms jackpot pheno that had systemic powdery mildew. It would be cheap at twice the price for it's performance.

My humidity runs 10% and this strain showed mildew. Nothing else touched it and I was at 5 weeks flower. I killed the clones of the strain off after finishing (I cried it was so good). But at least I didn't lose a table and I brought her to harvest safely.
 
Thegermling

Thegermling

Well-Known Member
curious2garden said:
It allowed me to reach harvest with a Bodhi Lucky Charms jackpot pheno that had systemic powdery mildew. It would be cheap at twice the price for it's performance.

My humidity runs 10% and this strain showed mildew. Nothing else touched it and I was at 5 weeks flower. I killed the clones of the strain off after finishing (I cried it was so good). But at least I didn't lose a table and I brought her to harvest safely.
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Adding UV lighting can help with PM and pests too. I added a HLG UVA strip to my grow and I’m going to try to get a plant to produce PM so I can see if it does the job of killing it. Plus you get more trichomes and more smell. I was waiting for LED versions of UV because fluorescents are too damn bulky.
 
curious2garden

curious2garden

Well-Known Mod
Staff member
Thegermling said:
Adding UV lighting can help with PM and pests too. I added a HLG UVA strip to my grow and I’m going to try to get a plant to produce PM so I can see if it does the job of killing it. Plus you get more trichomes and more smell. I was waiting for LED versions of UV because fluorescents are too damn bulky.
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On systemic powdery mildew eh? I'd love to see the science behind that.
 
BarnBuster

BarnBuster

Virtually Unknown Member
curious2garden said:
It allowed me to reach harvest with a Bodhi Lucky Charms jackpot pheno that had systemic powdery mildew. It would be cheap at twice the price for it's performance.

My humidity runs 10% and this strain showed mildew. Nothing else touched it and I was at 5 weeks flower. I killed the clones of the strain off after finishing (I cried it was so good). But at least I didn't lose a table and I brought her to harvest safely.
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Is there a shelf life listed on this?
 
Aussieaceae

Aussieaceae

Well-Known Member
curious2garden said:
On systemic powdery mildew eh? I'd love to see the science behind that.
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Could you direct me to some scientific information regarding systemic powdery mildew? Only ever hear, or read about it from cannabis growers. I've looked far and wide online for any biological, or horticultural studies regarding it.

I can't find any scientific studies, or evidence to support any Erysiphales being a systemic infection. From what i gather, it's an exterior infection, in which mycelium draw nutrition from the host cells.

Not trying to contradict what you're saying. Would really like to see a scientific study regarding it. It's an interesting topic, and i haven't been able to find any reliable science in the past. If there's any you can link me to, it'd be much appreciated.

Thank-you. :peace:
 
curious2garden

curious2garden

Well-Known Mod
Staff member
Aussieaceae said:
Could you direct me to some scientific information regarding systemic powdery mildew? Only ever hear, or read about it from cannabis growers. I've looked far and wide online for any biological, or horticultural studies regarding it.

I can't find any scientific studies, or evidence to support any Erysiphales being a systemic infection. From what i gather, it's an exterior infection, in which mycelium draw nutrition from the host cells.

Not trying to contradict what you're saying. Would really like to see a scientific study regarding it. It's an interesting topic, and i haven't been able to find any reliable science in the past. If there's any you can link me to, it'd be much appreciated.

Thank-you. :peace:
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It all hinges on the definition of systemic. This is an interesting article:
https://www.medicinalgenomics.com/powdery-mildew-systemic/

Definitely not peer reviewed, primary research, science but interesting none the less.

I grow in the Mojave Desert. I don't run air conditioning and my grow is indoor hydro. During the summers my humidity never tops 10% so why did I have PM showing up in that Bodhi clone each generation and worsening? I flowered it sitting right next to many other strains who were never touched by PM.

Although it is easily debatable it is not technically a systemic illness it was only treatable by a systemic. All the environmental and topical therapies failed. This leads me back to my experience in medicine with topical fungal infections, for example distal subungal onchomycoses is commonly caused by a dermatophyte. It is still a topical illness however it requires a different form of treatment (systemic), than simple ringworm or athlete's foot once it has burrowed under keratinized protein. Simple topicals were not effective.

So the taxonomy isn't as important to me as the functional treatment and that experience has been borne out on these grow forums. The semantics vary from the classroom definitions. I gave up and now pretty much go with the colloquialisms, hope that helps.
 
Coloradogrower710

Coloradogrower710

Well-Known Member
z3rgling said:
Let us know how well the Actinovate works. If that fails, garden safe fungicide 3 works well. It is organic and available at most big box stores.
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Seems like it worked haven’t seen more PM checking everyday now I got RH down also these two in tandem I’m hoping the pm won’t be back
 
Thegermling

Thegermling

Well-Known Member
curious2garden said:
It all hinges on the definition of systemic. This is an interesting article:
https://www.medicinalgenomics.com/powdery-mildew-systemic/

Definitely not peer reviewed, primary research, science but interesting none the less.

I grow in the Mojave Desert. I don't run air conditioning and my grow is indoor hydro. During the summers my humidity never tops 10% so why did I have PM showing up in that Bodhi clone each generation and worsening? I flowered it sitting right next to many other strains who were never touched by PM.

Although it is easily debatable it is not technically a systemic illness it was only treatable by a systemic. All the environmental and topical therapies failed. This leads me back to my experience in medicine with topical fungal infections, for example distal subungal onchomycoses is commonly caused by a dermatophyte. It is still a topical illness however it requires a different form of treatment (systemic), than simple ringworm or athlete's foot once it has burrowed under keratinized protein. Simple topicals were not effective.

So the taxonomy isn't as important to me as the functional treatment and that experience has been borne out on these grow forums. The semantics vary from the classroom definitions. I gave up and now pretty much go with the colloquialisms, hope that helps.
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From what ive been told PM is an obligate parasite (that it lives only on the surface) that penetrates a few layers of cells on the plant. Either way using something like UV will keep molds and pests away on the surface plus it enhances trichomes, smell,etc. So, theres really no point not to add UV. For those that think its systemic use regalia , procidic2, etc. Im glad I got both bases covered either way.
 
curious2garden

curious2garden

Well-Known Mod
Staff member
Thegermling said:
From what ive been told PM is an obligate parasite (that it lives only on the surface) that penetrates a few layers of cells on the plant. Either way using something like UV will keep molds and pests away on the surface plus it enhances trichomes, smell,etc. So, theres really no point not to add UV. For those that think its systemic use regalia , procidic2, etc. Im glad I got both bases covered either way.
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You didn't bother to read that link, did you? Suffice to say PM is not one homogenous fungal disease.
 
Thegermling

Thegermling

Well-Known Member
curious2garden said:
You didn't bother to read that link, did you? Suffice to say PM is not one homogenous fungal disease.
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I did read that link. They arent even sure its systemic is what I got from that read. An example of a systemic mold is bud rot. PM needs its host alive to steal its nutrients and such. Thats why PM is an obligate parasite.
 
Aussieaceae

Aussieaceae

Well-Known Member
Not sure any fungi are systemic in the way they find / infect a host. Am i missing something here?
Systemic fungicide will be an effective treatment because It's systemic.

For a fungi to be systemic infection in a plant, wouldn't it have the ability to exist in a water soluble form, to move around within the plant itself? It would also need the capability to infect from the inside out.

Taking a tissue sample and finding fungi DNA on an obviously already infected plant doesn't prove anything. Nor does it contradict existing information on how it may have become infected in the first place. If it was a sample of the plants sap on the other hand....though it wasn't. Why not?
If the DNA was present in the sap, all leaf samples would have tested positive. They would have to.

As far as i'm aware, the only documented systemic plant infections are viral ones?

Happy to be proven wrong.
 
Thegermling

Thegermling

Well-Known Member
Aussieaceae said:
Not sure any fungi are systemic in the way they find / infect a host. Am i missing something here?
Systemic fungicide will be an effective treatment because It's systemic.

For a fungi to be systemic infection in a plant, wouldn't it have the ability to exist in a water soluble form, to move around within the plant itself? It would also need the capability to infect from the inside out.

Taking a tissue sample and finding fungi DNA on an obviously already infected plant doesn't prove anything. Nor does it contradict existing information on how it may have become infected in the first place. If it was a sample of the plants sap on the other hand....though it wasn't. Why not?
If the DNA was present in the sap, all leaf samples would have tested positive. They would have to.

As far as i'm aware, the only documented systemic plant infections are viral ones?

Happy to be proven wrong.
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Now youre getting deep haha. Im not sure bro but some molds are different than others. Im no expert there. I only remember another grower on here telling me that pm is not systemic when I thought it was. I did a little digging around and found out he was right.
 
Coloradogrower710

Coloradogrower710

Well-Known Member
Ok guys what I used didn’t work. Had more of the same. Light pm on fan leafs. Pondering what to try next thinking maybe baking soda since I have it. Or maybe milk? What are your thoughts?
 
Cali.Grown>408

Cali.Grown>408

Well-Known Member
PH your water to 11.0-11.5 and foliar spray. Thank me later. Or mix water with 1/4 hydrogen peroxide and foliar or rub in with q-tips. You can also thank me later for that one lol
 
Coloradogrower710

Coloradogrower710

Well-Known Member
Hey guys. I did the baking soda spray it seems to have worked it left a slight residue on my fan leafs. But they are still looking green and healthy. I did notice some browning of the hairs on my buds but that will happen when you spray.
 
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