Powdery mildew??? Please help identify!

Thank you all for taking the time to reply and share knowledge/experiences with me. All of it is greatly appreciated!

I will try the different methods to see if I can get the PM under control. I'll start with the home made organic/holistic recipes such as peroxide, milk, baking soda, garlic and such, then move up to the harsher chemicals if and only if necessary and as a last resort.

A good thing is that I'm still vegging the clones, and didn't plan on blooming till next month. I will not however used hash chemicals once I start blooming. I'm much to inexperienced with indoor and using chemicals so I'll avoid as much as I can.

Worse case I will just throw all 12 outside when the daylight 12+ hours come which is March 20th I believe.

Worse worst case I'll just toss them all and just start fresh, but this time with a finished and complete grow box set up with all I need to control humidity.

I do have one question, if the PM continues and I decide to throw clones outside, I may try to make S1's self polinate some of them, will the powdery mildew issue implant itself in the seeds or genes?

In other words, if I make seeds from pm contaminated clones will the PM show up when I germionate those seeds?

Another question, how fast does pm spread? The last pics I took it looks like the PM is only on the tips of the leaves, bit it seems it hasn't spread to any other area of leaves or any other leaves.

CannabisseurCultivar said:

I've heard of eagle 20, and even though I know it will work, my grow box is in a occupied room and therefore I don't want to spray since eagle can be pretty toxic. But as a last resort I may move my grow box outside to spot treat with the eagle. Hoping I can avoid it though since I was trying to keep it organic. Anyways, thank you very much for the info, very much appreciated brother.

Click to expand...

You're welcome. I suggested Eagle20 because it is one of the best fungicides on the market. The truth is no one knows what the side affects of this product is. There are very limited studies done on it. Eagle is approved for use in the US on fruits and veggies. Eagle is approved for use in other countries on Tobaco crops. Supposedly it can stay in the plant for a few weeks. I have read up to 25 days or something. And that was in tobacco. The difference between cannabis and Tobacco is you do not smoke cannabis leaf. The leaf is where you apply the eagle. Beyond that I don't have enough info to speak on side affects of eagle 20 so can't make a intelligent statement. Never directly spray your buds with any type of pesticide,fungicide, tea or water. First get your humidity under control or you will constantly battle PM issues.

My advice of using eagle in week 4 would be for drastic situations like spot treating PM. You would never douse your plant with any treatment once you are in week 4.

Please do some more research for yourself on this product. Don't take the lazy way out listening to people telling you the sky is falling by using this product. Especially since no one can say for sure what the side affects really are.

CannabisseurCultivar said:

Very good and thorough info thanks Jimdamick! I agree keeping rh low is tricky. Right now its not that bad since its at 55-60.

I have one fan inside box but only passive intake and exhaust. I will be adding inline fan, filter for exhaust and small computer fan (100+ CFM) for intake.

I also have to light seal/proof the box.(caulk the seams and line the door with weather strip)

Once all that is done I'm sure it will help control humidity. Is Daconil anything like Eagle 20? I'm trying to avoid the harsh chems as much as possible.

Thanks for your reply brother very much appreciated!

Click to expand...

Daconil is safe and effective, comes in a spray bottle. I reduce it to about 75%/25% water to even dilute it further. It works great, and 1/4 the cost of the Eagle shit.

CannabisseurCultivar said:

Another question, how fast does pm spread? The last pics I took it looks like the PM is only on the tips of the leaves, bit it seems it hasn't spread to any other area of leaves or any other leaves.

Click to expand...

Once it is in your area, it is already everywhere pretty much, as it is spread by spores, so with any air movement it gets everywhere, at least the spores do. You have to spray all your plants asap in order to contain it, the sooner the better. I got in my buds last grow and totally fucked me. If it is only on your leaves, count your blessings.
Use the Daconil (Amazon Prime/2 day delivery) along with diluted bleach in a spray bottle for your tent and your done.
(You MUST dilute the Daconil in order for a fine spray)

Jimdamick said:

Daconil is safe and effective, comes in a spray bottle. I reduce it to about 75%/25% water to even dilute it further. It works great, and 1/4 the cost of the Eagle shit.

Click to expand...

Sir, Danconil is made for use on golf courses and front yards. Danconil is not even in the same category as Eagle20. Applying any type of over the counter Home Depot product to your crop is a joke and bush league at best. Myclobutanil-based fungicides, including Eagle 20, are applied to a wide range of edible agricultural products (grapes, apples, spinach, etc). Though eagle 20 is not approved for Tobacco use in America it is approved in other countries around the world. Read a book. Sorry to the OP for my rants.

I've had pm problems twice once outdoor I used baking soda during veg and the pm went away.. Then I had indoor pm and that was not going away I'm sure the pm was still in the room somewhere

GuyLeDuche said:

Wow, I never like to bash others, but please don't use eagle20 in flower. I know many commercial growers would let someone smoke poison to make a buck, but don't do that to yourself. That shit is a systemic poison, that's why it works on a systemic infection (PM). This means the poison is in the plants in significant amounts for long periods, not just on the outside like neem oil or something. The real bitch about PM is the fact that it is systemic and can't be cured externally, you can only treat the symptoms. Just because you don't see spots doesn't mean it's gone. I've used many products, Daconil included, but until I got a dehumidifier the symptoms would always come back. Even with the dehu a sick plant will still have issues if conditions allow.

Click to expand...

Are you speaking from a background of science? Or because your signia says well known member?You can just spout out baseless information that people will accept as fact? The fact is you do no know what you are talking about. You have no idea how long Eagle20 remains in a cannabis plant. You are essentially fear mongering and spreading more disinformation on this forum.

CommercialGrow said:

Are you speaking from a background of science? Or because your signia says well known member?You can just spout out baseless information that people will accept as fact? The fact is you do no know what you are talking about. You have no idea how long Eagle20 remains in a cannabis plant. You are essentially fear mongering and spreading more disinformation on this forum.

Click to expand...

Tell us how long eagle stays with the cannabis plant. Your a sick puppy dude spraying that shit in week 4. And your a Commercial Grower? With patients? And quit jabbing at people about "well known member" like your some master at weed and shit. You didn't even know the correct npk over on the other thread. And now your telling members to eagle in flower. This thread should be wiped out and deleted. No disrespect to the OP, but this guys shit shouldn't be a part of this community. Not on this subject at least. And tell your Hydro store guy its not 28 days Be safer then that for fuck sake before the wrong patient smokes your shit and dies.

Mongo, no disrespect. I am a master grower by trade. Cannabis is my business. Within the first day of becoming a member here I saw you post enough bad information to make my head spin. You need to do less talking and more reading. I do not know how long you have been at this game but your skills are in their infancy. I get the vibe that some we'll know members speak from emotion as the final word. Little to do with experience or science. And if your experience entails a small closet grow then let some of the more experienced guys chime in. These forums can be a wealth of information when used properly. Unfortunatly these forums become a place where weekend warriors claim to know it all and spread horrible advice.

P.S

Sorry I didn't copy the correct NPK numbers from my bottles. I was alerted to the mistake and corrected it instantly. You are as only stupid as you act. Good luck with your grow.

CommercialGrow said:

Mongo, no disrespect. I am a master grower by trade. Cannabis is my business. Within the first day of becoming a member here I saw you post enough bad information to make my head spin. You need to do less talking and more reading. I do not know how long you have been at this game but your skills are in their infancy. I get the vibe that some we'll know members speak from emotion as the final word. Little to do with experience or science. And if your experience entails a small closet grow then let some of the more experienced guys chime in. These forums can be a wealth of information when used properly. Unfortunatly these forums become a place where weekend warriors claim to know it all and spread horrible advice.

P.S

Sorry I didn't copy the correct NPK numbers from my bottles. I was alerted to the mistake and corrected it instantly. You are as only stupid as you act. Good luck with your grow.

Click to expand...

Bro cannabis is all our business, wake up a little will ya? The truth of the matter is you have shit weed filled with eagle 20. Your in this business no more then the next guy. Stop acting like a hot shot. And stop poisoning your flowers.

CommercialGrow said:

Are you speaking from a background of science? Or because your signia says well known member?You can just spout out baseless information that people will accept as fact? The fact is you do no know what you are talking about. You have no idea how long Eagle20 remains in a cannabis plant. You are essentially fear mongering and spreading more disinformation on this forum.

Click to expand...

Lol, the " Well Known Member " means I've been here a few months or posted 100 times or some bullshit, it's meaningless. I didn't put it there

I'm no scientist but I did a ton of research when I had PM issues and found plenty to support my position, and nothing to support yours, so...

I would never call out someone's personal grow, but that shit is medicine dude. I live in WA where poison like that is sold to people as meds every day and it makes me sick tbh. I'm just glad I don't need to buy this junk off poison-peddlers anymore...

CommercialGrow said:

Sir, Danconil is made for use on golf courses and front yards. Danconil is not even in the same category as Eagle20. Applying any type of over the counter Home Depot product to your crop is a joke and bush league at best. Myclobutanil-based fungicides, including Eagle 20, are applied to a wide range of edible agricultural products (grapes, apples, spinach, etc). Though eagle 20 is not approved for Tobacco use in America it is approved in other countries around the world. Read a book. Sorry to the OP for my rants.

Click to expand...

Ok you seem to know very little about Daconil, so let me enlighten you. It is a fungicide that is perfectly safe for use on vegetables and fruit trees.

Daconil Fungicide Concentrate controls, stops, and prevents over 80 diseases on flowers, vegetables, shrubs, fruit and shade trees. Mix with water as directed and apply with a sprayer to control leaf spots, rust, blights, fruit rot, mildew and many other diseases.

• Controls, stops, and prevents over 80 diseases
• Controls leaf spots, rust blights, fruit rot, mildew and other diseases
• Use on flowers, vegetables, shrubs, fruit, and shade trees
• Concentrated formula is ready to mix with water
• A simple squeeze of the bottle measures the perfect amount for use
• Concentrated formula can make up to 64 Gal. fungicide

You really shouldn't be so full of yourself, because all it does is make you sound like a big mouthed idiot

CannabisseurCultivar said:

You were blessed to get rid of it! I've heard it's pretty tough to eliminate once it's in the grow room. I'll have to look up diamond shield. Thanks mate!

Click to expand...

Thanks alot mate,

It didnt look this hard to be honest!!

Like I sayed my plants was literly covered in white.

I removed all what I can, then sprayed them good even the main stem and branches.

Adjusted dehumidifier on 40% and increased airflow

After they have dried I can see small spores on leafs for couple of days.

Then everything dissappeard!

Now if am worried in any way about humidity in veg i spray with diamond shield and if am in flower i water with diamond shield!

Everything looks good so far!!

CommercialGrow said:

Serious in the sense of experienced. Some do not have the luxury to scrap an entire run over PM issues. Eagle 20 is viable option for treatment of PM.

Click to expand...

Your an experienced commercial grower with medical patients and advocate spraying Eagle 20 on budding plants?
I would love to see you smoke your shit, with a clear conscience, knowing you are giving ill people that crap you grow commercially. One other thing, for someone to show up on a pot site,and within 24 hours call a respected member (mongo frog) essentially stupid and a know nothing, really shows what a dick you are, and you basically made yourself out to be one arrogant asshole, that definitely won't be appreciated on this site. Calm down boyo, or you will be ostracized at every chance, and you won't like that. I can guarantee it

The best way to get rid of powder mildew is to purchase some Uncle Braggs Apple cider vinegar and with the ratio of 1:1 spray your ladies and watch the mildew disappear. Guarantee it will not win. However, you need to fix the real problem. In most cases powdery mildew comes from poor circulation. So check all of fans and spray them as well, the spores are everywhere. Good Luck...

CannabisseurCultivar said:

One more question, what could I use to disinfect, sterilize and kill 100% the mildew in my grow box? It's made of 1/2" plywood.

Click to expand...

Apple Cider Vinegar. Organic is best, although not detrimental.

GuyLeDuche said:

Wow, I never like to bash others, but please don't use eagle20 in flower. I know many commercial growers would let someone smoke poison to make a buck, but don't do that to yourself. That shit is a systemic poison, that's why it works on a systemic infection (PM). This means the poison is in the plants in significant amounts for long periods, not just on the outside like neem oil or something. The real bitch about PM is the fact that it is systemic and can't be cured externally, you can only treat the symptoms. Just because you don't see spots doesn't mean it's gone. I've used many products, Daconil included, but until I got a dehumidifier the symptoms would always come back. Even with the dehu a sick plant will still have issues if conditions allow.

Click to expand...

Yeah, no kidding. It doesn't matter if you only treat certain parts of the plant. Eagle is systemic and will contaminate the entire plant. If you use that stuff anywhere near flowering you're not doing it right. Using it during flowering is straight up diabolical.

The only time I ever use Eagle is if I bring in an outside clone, which I rarely do because of the risk of contamination. I dip the clone once in a 1.5ml/gal solution while it's small and more than 90 days from being finished. I just dip the plant, not the growing medium. I also take care not to touch the plant without gloves for several weeks after I dip it. I don't recommend spraying Eagle on and indoor grow because it's messy and you need a full hazmat suit. Not only that, but the residue remains and I wouldn't touch anything without gloves on for a long time. Make a solution in a bucket and dip them. Wear gloves and sleeves. Do it outside if possible and stay upwind, or in a well ventilated area with a fan blowing the fumes away from you. To keep the PM away in general I use a sulfur burner once when I switch to 12/12 and again 3 weeks later. That takes care of the surface area of the room itself as well as the plants. I also use a dehumidifier for all but the summer months. Doing all of these things together keeps my room free of PM. If you stick with a routine and are cautious, overly cautious in my case, you can keep PM away without having to use anything but sulfur or any other effective organic treatment. A dehumidifier is also key.

CommercialGrow said:

You're welcome. I suggested Eagle20 because it is one of the best fungicides on the market. The truth is no one knows what the side affects of this product is. There are very limited studies done on it. Eagle is approved for use in the US on fruits and veggies. Eagle is approved for use in other countries on Tobaco crops. Supposedly it can stay in the plant for a few weeks. I have read up to 25 days or something. And that was in tobacco. The difference between cannabis and Tobacco is you do not smoke cannabis leaf. The leaf is where you apply the eagle. Beyond that I don't have enough info to speak on side affects of eagle 20 so can't make a intelligent statement. Never directly spray your buds with any type of pesticide,fungicide, tea or water. First get your humidity under control or you will constantly battle PM issues.

My advice of using eagle in week 4 would be for drastic situations like spot treating PM. You would never douse your plant with any treatment once you are in week 4.

Please do some more research for yourself on this product. Don't take the lazy way out listening to people telling you the sky is falling by using this product. Especially since no one can say for sure what the side affects really are.

Click to expand...

Have you ever wondered why you named your self commercial grow ?

To be honest you’re lame and dumb as shit you should not be giving anybody advice Period

Eagle 2020 stays in a plant cell walls for up to 120 days you stupid shit bag

This chemical is actually well-documented to cause cancer because when heated the leftovers on the plant and within the plants cell walls vaporize and when that chemical vapor rises it breaks down into another chemical which is a highly toxic heavy carcinogen you stupid uneducated piece of human garbage selling weed and you don’t even know how to fucking grow it

AAA420Report said:

Have you ever wondered why you named your self commercial grow ?

To be honest you’re lame and dumb as shit you should not be giving anybody advice Period

Eagle 2020 stays in a plant cell walls for up to 120 days you stupid shit bag

This chemical is actually well-documented to cause cancer because when heated the leftovers on the plant and within the plants cell walls vaporize and when that chemical vapor rises it breaks down into another chemical which is a highly toxic heavy carcinogen you stupid uneducated piece of human garbage selling weed and you don’t even know how to fucking grow it

Click to expand...

You’re just a lazy uneducated shit bag that doesn’t know how to grow weed that’s why you use eagle 2020