Powdery Mildew... Which route to take next?

[lg42]

I've been dealing with PM in my garden for the past month.. I've sprayed with a hydrogen peroxide/water solution multiple time and the PM is still persistent. I have around 20 plants all in veg, half of which are getting large; was going to flower a week ago but am waiting to remedy this problem. My main worry is my mother plants and some clones that are now effected that were going to be a part of my larger scale co-op medical outdoor/greenhouse grow this season. I absolutely cannot introduce infected plants into that environment. I've gotten some advice elsewhere a couple weeks ago and a few told me to cut everything down, clean everything, and basically re do my grow room and get new plants. A couple others I have spoken to seem to think I can get rid of it. I am now leaning towards cutting everything down and starting fresh and getting stuff ready for my outdoor, but that would pretty much screw me financially and not to mention hurt my stash quite a bit. I am basically giving myself a 10 day window to see drastic improvement or they are going.. Is there anything else I can and should be doing to get rid of the PM, and can I actually indeed get rid of it for good without the risk of it reappearing on clones, etc? Or should i just re start and clean the hell out of everything. Oh.. And I should add RH was around 35-50 when PM broke out, has since been no higher than mid 30's.

Thank you!

 

[ismokealotofpot]

Try just hydrogen peroxide don't dilute it.what you really need is 35% food grade hydrogen peroxide. then you need to dilute that to 7% and you have to use distilled water IMO.

 

[ismokealotofpot]

WARNING: 35% hydrogen peroxide is a strong oxidiser. Use rubber gloves whenever handling full strength H2O2 and, as with all medicines and chemicals, keep out of reach of children.

 

[ismokealotofpot]

I'm seeing one part hydrogen peroxide three parts water, try a more concentrated mix

 

[roidrage152]

If what u r trying to do is squash the pm these contact remedies are not going to help u. H202. Milk, peppers, high ph, sulfur, neem, are all just surface remedy that knock it down for a couple days. I tried Everything that wasn't a chemical first with no luck. I got PM from clones when I was first starting. Everyone around me had mites so PM was the lesser of 2 evils to deal with. My room was pretty new so was easy to clean if there were spores lurking about. Eagle20 is a popular chemical systemic for PM. Its pricey so I found a product at Lowes withe same active ingredient. immunox is the name, I got the concentrate was about $15. Make sure u don't get immunox plus, that has an added insecticide and I believe is not safe for consumables. I used the dosage in the instructions recccomended for tomatoes. It actually was one of the higher dosages. I sprayed every inch of leaves on my big plants, and dipped every plant that was small enough to dip down to the edge of the stem. Clones in aero I dipped root and all. Everything bounced back beautifully and now months later, no pm. This systemic is only supposed to last 18 to 30 days so I had every expectation of having to do it again, but I have not. People say once u get pm it lives in the plant forever are incorrect. Though if u have a lot of spores around they can lie dormant anywhere. Scrub as well as you can in the room, but honestly u are just as likely to bring a spore in from outside , so maintaining a good environment after u knock out the infection is the best u can do.

I won't go so far as to say this is the only way, but u definitely need to use a "systemic" rather than a "contact" remedy. pM does live inside the plant. What you see on the surface is just the reproductive spores. I have seen organic systemics if u want to mess with them, but I know what I did works, so I would jump to that step if it's an option for u.

 

[DST]

If it's a long term operation you got with co-ops etc in mind. Tear it down and start again. You are not even in flower yet and it will just get worse. If you are a caregiver and passing these meds out they are not really going to be classed as high level if there is mildew on the bud.
Once a plant has PM, you cannot kill it. It is a disease in the plant and will continue regardless. If the right conditions are there, it will raise it's powdery head. If you takes clones from a plant that has PM, the clone will likely be susceptible to it as well. I think in the long run starting again is a good idea. Sorry to say that. I wish you luck with it.
DST

 

[ismokealotofpot]

You cant just spay once and call it good. keep doing it every few days. you want to spray until it drips off, or go with some other stuff.

 

[Icannabis]

this is one of those environment issues...I always sprayed my grow area down with an anti fungicide and an insecticide walls and ceiling everywhere I can think of...if I find a infected plant I would remove them but to date I haven't...well because I grow from seed and if I do keep a mother I discard them after 6 months anyhow...seed can carry disease too though...best to remove and start fresh with any of these kinds of problems...it's not your fault because you inherited the problem...this is why I don't buy clones from dispensaries well I have but it was an out door plant that did great I remember taking clones from but no diseases ok off subject...anyway man sorry and good growing

 

[lg42]

Thanks for the replies.. I have been spraying with food grade H2O2 at a 1:4 ratio with water over the past 3-4 weeks, pretty sure they are just going to come down. I'm a medical grower and have a pretty heavy outdoor grow this season riding on me being able to veg out healthy clones in the upcoming months. I guess it's about time to start cleaning.

 

[jonnyquest]

1 part milk to 9 parts water sprayed on every.couple of days for.a week will.clear you mildew then take care of the cause which in my case was high humidity and overcrowding

 

[BeaverHuntr]

If it's a long term operation you got with co-ops etc in mind. Tear it down and start again. You are not even in flower yet and it will just get worse. If you are a caregiver and passing these meds out they are not really going to be classed as high level if there is mildew on the bud.
Once a plant has PM, you cannot kill it. It is a disease in the plant and will continue regardless. If the right conditions are there, it will raise it's powdery head. If you takes clones from a plant that has PM, the clone will likely be susceptible to it as well. I think in the long run starting again is a good idea. Sorry to say that. I wish you luck with it.
DST

Is this 100% true?
I been using Zero Tolerance Fungicide by Ed Rosenthal and it seems to have taken care of the mildew on leaves.. Now you harshed my mellow..

 

[ismokealotofpot]

Pm is is really that much of an issue? shit I had it once and just wiped it off with my finger and got dehumidifier and that was that. I think it was the treating yourself magazine a guy uses food grade peroxide dilutes it to 7% and sprays all the time with a pump sprayer.

 

[BeaverHuntr]

Pm is is really that much of an issue? shit I had it once and just wiped it off with my finger and got dehumidifier and that was that. I think it was the treating yourself magazine a guy uses food grade peroxide dilutes it to 7% and sprays all the time with a pump sprayer.

It can be if you dont get rid of it before bloom, moldy buds would suck.