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Can I spray my buds for powdery mildew?

Discussion in 'Marijuana Plant Problems' started by Buggins, Dec 4, 2011.


    Buggins Active Member

    I'm currently 5 weeks into flowering and I've been fighting a powdery mildew problem off an on for the past few weeks.

    I started with neem oil, but now it's too far long into flowering to use neem, in my opinion. So now I've got that Green Cure potassium bicarbonate powder to use.

    I haven't tried it before, but before I go spraying willy nilly, I wanted to get some feedback on whether or not spraying my buds with potassium bicarbonate will kill the pistils and stunt the bud growth.

    My last small grow I had a major mildew problem, and I was able to finally beat it by spraying every other day with a milk solution. However, it seemed to make all of my pistils turn brown within a couple days, and then the buds just completey stalled out, and never really did re-gain any of their density.

    That was just a little test grow, but this one is my main source of meds for the next few months, so I want to make sure it makes it to harvest healthy, and without a diminished yield.

    So can I go ahead and spray down my plants with potassium bicarbonate at the recommended dosage, and not worry about it stunting my plant's flowering progress?

    darkliight Member

    I found a thread that could be of some help to you.


    I have read that potassium bicarbonate can be unhealthy for the plants, and may cause some issues. However, I have also read the exact opposite. I hope the thread will help you though before anymore damage is done to your girls. Sorry to hear about that last grow.


    Cannabis Culture: Powdery Mildew

    California Integrated State Management Program

    tyke1973 Well-Known Member

    I would not spray the buds with anything,get a sulpher burner.....................tyke


    been through all this, if you have at least 3 weeks before harvest, get some eagle 20 and you will NEVER see p.m again.
    don't use if your pulling in less than 3 weeks.
    everything else is just temporary solutions. Eagle 20 cures the plant systemically.
    if you have to use something in the last 3 weeks, get pm wash. it's perfect for using on actual buds.
    a mongo frog

    a mongo frog Well-Known Member

    this guy knows what hes talkin about. get some fast. eagle 20 that is.
    then the next run u do. spray them last week of veg or second week of flower. and yes never see pm again.

    dart420 New Member

    Just do a little research on "eagle 20" before you spray it.
    a mongo frog

    a mongo frog Well-Known Member

    yea ok, dont spray it then. let the whole grow go to shit. thanks dude.


    I've done the research, Guess what? The shit works.
    I give a small amount to customers who have pm problems, EVERYONE of them has reported back with the results I expected.
    They don't have a pm problem anymore.

    Buggins Active Member

    I grow organic so the eagle 20 is out. Sorry, should have mentioned this first.

    dart420 New Member

    And instead of curing the reason they have it, usually inadequate ventilation. Your curing the symptoms and in turn giving them a toxic cure that causes cancer??? Do you also tell them it take 60 days in lab tests with grapes??? I could care less to argue with you, all I wanted to do www make the op aware of what he's using on a plant he intends to consume. Good day to you.

    darkliight Member

    One powdery mildew organic remedy is to use dilute solutions of hydrogen peroxide. Spray it on the plants thoroughly about once a week. Organic removal of powdery mildew is always preferable to using harsh chemicals on your plants. As ways remember, man the best way to take care of powdery mildew is by prevention. What strain are you working with, if you don't mind me asking?

    darkliight Member

    Also, garlic is known for its fungicidal properties. You could make a garlic fungicide spray as well.
    I got a good link on organic plant disease remedies.


    Also has other remedies that use elder leaves.

    unohu69 Well-Known Member



    I found this to be useful, I have a big bottle here but have yet to use it.

    Product Description

    Thousands of commercial growers use SerenadeĀ® Garden Disease Control to control foliar diseases, because it's so safe you can spray and harvest the same day. OMRI (Organic Materials Review Institute) listed, SerenadeĀ® Garden Disease Control contains Bacillus subtilis, a soil-dwelling bacterium that controls leaf blight, black mold, powdery mildew and many other diseases.


    none of that shit gets rid of the problem. I sprayed eagle 20 once, over a year ago and have never seen pm since.
    SO< I'll smoke a little chemical ONCE, Instead of smoking fungus spores over and over and over and over.

    unohu69 Well-Known Member



    • Convenient, liquid formulation
    • Prevents/treats dollar spot, anthracnose, summer patch, brown patch, powdery mildew, rust and scab
    • Available in two convenient sizes &#8212; one-gallon jugs and one-pint containers
    • Systemic protectant
    • For use on golf course fairways, roughs, tees and greens, commercial and residential stone fruit trees, apple trees and grapes, and other landscape ornamentals
    • For use on ornamentals such as chrysanthemums, daylilies, poinsettias and roses in nurseries, landscapes and greenhouses
    • Best control of labeled diseases is achieved when EagleĀ® 20EW is applied on a seven- to 10-day application schedule

    So many recommendations and no links or information.....

    Check it out, decide for yourself. anything is worth trying at least once....
    a mongo frog

    a mongo frog Well-Known Member

    this fucking post makes a whole lot of sence!!! A little chemical or smoke fucking Mold.
    i think id rather smoke some bud that has been eagle 20 last week of veg, than Mold.

    Buggins Active Member

    Multiple strains at the moment, Afghan Kush, Hindu Kush, Super Silver Haze, Skunk #1, Real Killer Skunk, Pineapple Express, Moby Dick. All of em have it equally as bad.

    I've used hydrogen peroxide already, but it seemed to burn my pistils and stopped the buds from maturing. Maybe I was using too high of a concentration?

    What dilution would you recommend using the 3% hydrogen peroxide?

    bkbbudz New Member


    cannabineer Ursus marijanus

    I have read of milk being used as a PM stopper. Some older threads should appear with milk as the search term ... cn

    Buggins Active Member

    Powdery mildew is only an irritant to the respiratory system, not a carcinogen like some ingredients in the eagle 20.

    I would choose to smoke the former if I had to, but would prefer neither. Honestly, if I can't solve the problem before harvest, then I will salvage what I can by giving the buds a soak in hydrogen peroxide to neutralize the powdery mildew, or just making hash.

    However, with basically 50% of flowering left to go, I am hoping to take care of this now and still manage a decent harvest.

    I've done what I can to make the environment hostile to powdery mildew, but it's just that time of year where it gets really hard to maintain, with it being so cold a damp all the time.

    So it seems that what it comes down to for organic solutions are high ph water, hydrogen peroxide, green cure, and milk solution.

    Now, back to my main concern, I need to know which of these I can spray directly into growing buds, without damaging them.

    I just finished weighing out my last harvest that got hit hard with powdery mildew, I averaged only half an ounce on a four foot tall plant in a 3 gallon pot. Pretty terrible. It seemed to me, that around week 5 they got the pm pretty bad. Upon discovering this I treated right away with a solution of hydrogen peroxide (2 tbsp to 1 L of water) which didn't slow it down much at all. I then sprayed the plants with a 10% milk solution, and this seemed to put the brakes on the PM. The spores that were there didn't seem to disappear, but it didn't spread either.

    At this point, it seemed that the buds just stopped getting bigger. They matured, and the pistils went orange, and checking the trichomes before harvest revealed them to be right on schedule (about 20% amber at 9 weeks) but they just didn't swell like they should have, thus my extremely small yield.

    Now, I'm not sure if this was caused by the powdery mildew, or by one of the treatments I applied, but I am a little worried to spray my buds with anything until I can be certain it's not going to burn the pistils and stop the bud growth.

    So it there anything I can spray on the entire plant, buds and all, to control powdery mildew, but not risk slowing or stopping the flowering process?

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