Powdery Mildew prevention help.

hey fellas,

I need a recommendation for a powdery mildew cure or prevention. I need something that is ok to use in the beginning stages of flowering, buds arent that big but they are there and i dont want to hurt them.

I bought some neem oil spray, but i just found someone on a forum saying that neem oil is not good to use on flowering plants. Is this really true, particularly for the early stage?

I'd really appreciate if someone can chime in with some experience. Need to figure this out asap! thanks y'all.

i had a powdery mildew problem once and i cured it buy after harvest i cleaned the room with bleach water. then my next plants that were going in were sprayed with serenade every 3 days for about 3 weeks until bigger budding had begun. then stopped using it. oh and made sure the next batch had more spacing for the plants and had added more fans (upper and lower) on the canopy.

For an organic fix you can try buttermilk. Just dilute it 50/50 with water.

i thought the only "cure" for PM was to produce seeds and start fresh.

Clones in norcal often come WITH pm. I plan on trying to make seeds for all of my strains.

I'd rather have 1 run that produces seed, than a lifetime of pm problems.
hopefully the high end dispensaries are minimalizing this...time will tell

Good luck!

2cup water
1 1/2 T baki ng soda
1T olive oil or grapeseed oil
1T insecticcidal soap = (1-2 teaspoon liquid soap with one quart of water). this is hand soap or dish soap. Dr. Bonners is probably the same.
1T vinegar


To the water add baking soda, oil, soap,.Lastly add the vinegar and enough water to make a gallon of liquid.
Do not use this solution when the temperature is going to be over 85. Try to pick a cool day. Put in a spray bottle and go nuts.

The big "T" is tablespoon. I use this on my tomatoes and on my mm during veg. never had to use it in flower. would not think that it would be an issue but I defer to the more experienced.

Quote:

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Originally Posted by isaacmstone

2cup water
1 1/2 T baki ng soda
1T olive oil or grapeseed oil
1T insecticcidal soap = (1-2 teaspoon liquid soap with one quart of water). this is hand soap or dish soap. Dr. Bonners is probably the same.
1T vinegar


To the water add baking soda, oil, soap,.Lastly add the vinegar and enough water to make a gallon of liquid.
Do not use this solution when the temperature is going to be over 85. Try to pick a cool day. Put in a spray bottle and go nuts.

The big "T" is tablespoon. I use this on my tomatoes and on my mm during veg. never had to use it in flower. would not think that it would be an issue but I defer to the more experienced.

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Sounds like a recipe for a toy volcano.:wtf:
Seriously, does it not get a wee bit fizzy when you add the vinegar to the baking soda?

Aloha,
Weezard

Yes it does, but it is not that big a deal.

It works. I will spray it on one day, wait a day, look at the leaves, probably spray again. Usually gets rid of the mildew in two or three applications.

Use it on roses, tomatoes. Got the recipe from my organic gardening club. There are other recipies as well. It may even work without the soap.

Quote:

---

Originally Posted by Weezard

Sounds like a recipe for a toy volcano.:wtf:
Seriously, does it not get a wee bit fizzy when you add the vinegar to the baking soda?

Aloha,
Weezard

---

Maybe you don't need the vinegar,

"An alternative nontoxic control for mildew is baking soda combined with a lightweight horticultural oil. Researchers at the University of Rhode Island have confirmed that a combination of 1 tablespoon baking soda plus 2.5 tablespoons oil in 1 gallon of water is effective against powdery mildew on roses. Use of this combination on other crops is still experimental."
from: WWWdotURI.edu/ce/factsheets/sheets/powderymildew.hTML

I had a mojor problem with Powdery Mildew last summer. I lost more than a pound of great bud to this problem. I went on a daily search for almost three months to find out how others have dealt with it.(both MMJ and tomato,rose and other normal gardeners)

First I found all of the recommendations that have showed up on this forum and others regarding Neem oil, Skim Milk, Serenade, Greencure and others. All of these solutions were applied after the fact once the grower discovered he had a problem. Of these the most effective seemed to be Fungaflor used by large scale indoor growers of all plant types.(based on my research not my actual use)

I am now convinced that the policy I will use from now on is to avoid the growroom conditions that make it easy for PM to take hold in the first place. Growroom humidity seems to be a major culprit here. Putting in more fans without addressing the overall humidty level will just give you more circulation of air that has too much humidity. Exchanging growroom air by intake of low humidity air while allowing the higher humidity air to exit the growspace will go a long way to preventing PM in the first place. There are other methods to deal with high humidity but this seems to be the most effective and introduces a new air supply with more co2 than the exiting air.

The most severe problems seem to occur with the "sealed room" methodology which tends to keep humidity levels high and also leads to some form of co2 suplement being needed. I am not contesting any of the methods others have suggested as they all seem to work at least in limiting or controlling the problem somewhat and many are highly effective but I feel it may be best to prevent the start of the problem. In some areas you may have to dehumidify the incomeing air before it gets to the growspace.