Powdery Mildew Cures

Im not sure how in my 10 years of growing i ended up with it. Havent really changed anything.

I took in some clones from someone. Noticed PM on one of the strains(had multiples and all had it). I quickly moved the rest to a separate room upstairs and into a quarantine tent. And binned the strain that had PM.

It could have been my own doing since when i got the clones I harvested the same day and turned my basement heat off so i could get 60F temps. But ive done this the harvest before around Christmas without issue. Though RH was much lower being winter and this go around was early spring.

This was 3 weeks ago.

Nothing new has appeared in the quarantine tent and nothing was appearing in the veg area. Well I switched the veg to flower a few days ago and noticed some on my strain ive ran for almost a year without issue.

I binned them all and kept one that was still in the veg room.

My plan is to do a sulfur spray on the one still in veg and bleach all the surfaces in my veg and flower room. Then 2 weeks later do another sulfur spray and cut clones and bin the plant.

I needed to close down my OP anyways to do home repairs. I was looking forward to getting another harvest in bUT oh well.

Im doing outdoors with this strain and want to make sure the clones get their best chance of survival.

Anything else I should do?

TL;DR Got PM. Threw all bUT one plant out. Plan on bleaching the roOm and curing the plant with sulfur sprays and making clones and then trashing it. Worried the PM will carry over to clones whose fate is outdoors

Man...no one?

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Hey.

I took in some clones as well, first time I had PM.

I did a sulfur vaporizer as my first counter attack against powdery mildew. After that tried a hydrogen peroxide wash post harvest to clean up the buds. No reduction in PM.

I next shelled out $5,200 CAD for a hydrogen trioxide generator to scour the air in my tent with PM killers. By itself it did not stop the PM. I was still running clones at this time.

Next I shelled out $300 for Regalia, a very expensive boost to the plant's immune system. At week 4 of flower and all the plants look healthy with no signs of PM - I did notice the PM late in flower in past grows.

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My advice - get rid of the clones. PM may not be systemic but I've found that the clone chain carries pm.

Of the above I'd recommend a sulfur burner and Regalia, the jury is still out on the AIRos system and it's expensive.

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Hobbes said:

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Hey.

I took in some clones as well, first time I had PM.

I did a sulfur vaporizer as my first counter attack against powdery mildew. After that tried a hydrogen peroxide wash post harvest to clean up the buds. No reduction in PM.

I next shelled out $5,200 CAD for a hydrogen trioxide generator to scour the air in my tent with PM killers. By itself it did not stop the PM. I was still running clones at this time.

Next I shelled out $300 for Regalia, a very expensive boost to the plant's immune system. At week 4 of flower and all the plants look healthy with no signs of PM - I did notice the PM late in flower in past grows.

.

My advice - get rid of the clones. PM may not be systemic but I've found that the clone chain carries pm.

Of the above I'd recommend a sulfur burner and Regalia, the jury is still out on the AIRos system and it's expensive.

.

Click to expand...

Yeah i read threads of your troubles.

Sucks to lose a solid strain while tryjng ro acquire new strains

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One other product that works wonders is Dr Zyme's Eliminator - fermented fruit juices that digest the pm and spores. Fairly inexpensive by the gallon. It can be used as a post harvest wash as well.

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Last thing I can think of is to foliar spray to change the Ph of the leaf surface - PM cannot live on some Phs.

Another last thing is to heat up your tent - PM stops growing around 90 F and dies at just over 100 F.

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From here on out just create an IPM plan that includes products that attack PM through a variety of different ways. Regalia is a top choice for prevention. I would spray the plants weekly with something alternating between regalia, neem/silica, a biofungicide (Southern Ag Garden Friendly Fungicide is good), potassium bicarbonate, aspirin, kelp extract, and chitosan. Some of these can be combined-for example, I frequently combine aspirin, kelp, and chitosan. Using these different products will create a healthy plant with a very inhospitable leaf surface for PM. Also, air circulation is of paramount importance, make sure there is air blowing through every nook and cranny both above and below (and through) the canopy.

There is no real cure once you have it on your plants. Well there might be but cannabis plants would not survive the treatments and if you're in flower the product would be unsmokable.

As @Rurumo said get a prevention plan down and stick with it. I spray in veg weekly switching between a potassium silica spray and a sesame oil based concoction I've been working on for pests. So far it's been working. I've never had any PM indoors and haven't had any bugs for years but the big test came last summer when my potassium silicate sprays essentially eliminated any PM outbreaks outdoors in my garden. That stuff had been ravaging some of my plants for years but a weekly spray of potassium silicate and I didn't have any PM last year.

Hobbes said:

.

One other product that works wonders is Dr Zyme's Eliminator - fermented fruit juices that digest the pm and spores. Fairly inexpensive by the gallon. It can be used as a post harvest wash as well.

.

Last thing I can think of is to foliar spray to change the Ph of the leaf surface - PM cannot live on some Phs.

Another last thing is to heat up your tent - PM stops growing around 90 F and dies at just over 100 F.

.

Click to expand...

Potassium silicate works by raising the pH on the surface of the leaf to a level where PM cannot live.

xtsho said:

There is no real cure once you have it on your plants. Well there might be but cannabis plants would not survive the treatments and if you're in flower the product would be unsmokable.

As @Rurumo said get a prevention plan down and stick with it. I spray in veg weekly switching between a potassium silica spray and a sesame oil based concoction I've been working on for pests. So far it's been working. I've never had any PM indoors and haven't had any bugs for years but the big test came last summer when my potassium silicate sprays essentially eliminated any PM outbreaks outdoors in my garden. That stuff had been ravaging some of my plants for years but a weekly spray of potassium silicate and I didn't have any PM last year.

Click to expand...

Oonly problem is u cant spray in flower.

Seems to be two camps. One side says its systemic and cant be beat unless u myclobutanil and the other side who claims its easy.

Wish i could turn back rime and not take in clones

firsttimeARE said:

Oonly problem is u cant spray in flower.

Seems to be two camps. One side says its systemic and cant be beat unless u myclobutanil and the other side who claims its easy.

Wish i could turn back rime and not take in clones

Click to expand...

I worded my post poorly. I should have said there is no easy 100% cure once you get it.

If you do kill it on your plants the spores are still going to be present wherever the plants are so you'll have to eradicate it from your grow environment because a few spores can start it all over again even if you previously were able to get rid of it completely. That could mean a lot of cleaning. Not to mention the fact that wherever you go outside and then back inside you can be carrying it with you. It's in the air. The best thing you can do is prevent it by creating an environment that it can't grow. That can include spraying and controlling the climate to make it unfavorable.

Unfortunately you're in flower so your options are limited.

Clones are definitely an infection risk. There are only a couple people I would accept clones from. A couple years back someone showed me their grow. As soon as they opened the door to where their grow was I backed up. I could immediately see the obvious signs of mites, a bunch of sickly plants, filth with dirt on the floor, garbage lying around, etc... They were critical of me for refusing to go into their grow but I didn't care. When I got home I stripped down to my boxers at the washing machine and threw my clothes in before going into the main part of the house.

That's why I make seeds. I don't trust plants from other growers after seeing what I've seen over the years.

xtsho said:

I worded my post poorly. I should have said there is no easy 100% cure once you get it.

If you do kill it on your plants the spores are still going to be present wherever the plants are so you'll have to eradicate it from your grow environment because a few spores can start it all over again even if you previously were able to get rid of it completely. That could mean a lot of cleaning. Not to mention the fact that wherever you go outside and then back inside you can be carrying it with you. It's in the air. The best thing you can do is prevent it by creating an environment that it can't grow. That can include spraying and controlling the climate to make it unfavorable.

Unfortunately you're in flower so your options are limited.

Clones are definitely an infection risk. There are only a couple people I would accept clones from. A couple years back someone showed me their grow. As soon as they opened the door to where their grow was I backed up. I could immediately see the obvious signs of mites, a bunch of sickly plants, filth with dirt on the floor, garbage lying around, etc... They were critical of me for refusing to go into their grow but I didn't care. When I got home I stripped down to my boxers at the washing machine and threw my clothes in before going into the main part of the house.

That's why I make seeds. I don't trust plants from other growers after seeing what I've seen over the years.

Click to expand...

Not in flower. I flowered Sunday. Found PM yesterday so i tossed them all and everything in veg but one plant. Plan is to clean that one up make clones from it and clean the room. and then clean the clones weekly. Going to leave one merristem and remove everything else so there is less space for it to hide. Spray everythjng down with a 10:1 bleach to water mix

Ive never had PM so I dont think its outside. I never see it on anythjng

Believe the source of infection was the clone i took in.

Once clones are ready to go outside out they go and im closing down shop for a few months while I do home renovations. This was the plan all along. Just wanted to get one more harvest in. Hell the GF will be happier since it means the renovations will be done 3 months earlier.

For PM I burned sulfur on a hot plate in my grow room. Seemed to work

lots of treatment and IPM info here