OMG!!! Tell me more! Your posts are definitely fascinating! I love them!! You are seriously my mildew guru right now.
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Guess I never thought of it that way…I suppose when I think of IPM it’s inextricably linked to spraying shit every few days.
It was a dispo cutting I didn’t treat beforehand, exacerbated by poor environment (had an extraction fan plugged into a operating timer outlet I forgot to switch off, rather than running constantly, leaving my area stagnant and humid for 12 hours a night). Do I 100% know if that particular time it was the chicken or the egg? No, can’t say I do.
I have, however, gotten it in winter with no outside cuttings or plants in the garden, but improperly thinned plants, too close, leaves touching it, etc. It would have had to have arrived on spores. On rare occasions I get lazy it can show back up, few spots here and there in a dense neglected part of the canopy, but I haven’t seen any in a long time.
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For the love of God, don’t spray iso on your plants.
Hydrogen peroxide, spray on the plants and especially on the mold. Then remove the contaminated bud.
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I didnt spray my plants because it hadnt seen anymore mildew. I binned the plants that had it and moved everything else to a quarantine tent 5 weeks ago.
Well i moved the plants from the quarantine tent after not seeing PM for a month 3 days ago and i check today and see some on a leaf. Its been 75F and less than 50% RH the whole 3 days. Spaced out. Circulating fans.
I dont get it. Was the quarantine tent just perfect conditions for it to not grow and it just lay dormant?
Im feeling very discouraged about this issue.
Feeling like it cant be beat.
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just apply a sulfur spray, it’ll be toast.
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Once it infects a plant, it is almost impossible to get rid of without fungicides. Even if you drop the humidity to near zero, it will still spread once it has a toehold in the plant. Humidity out west can be in the low teens and the mildew still spreads. Once the hyphae extend into the outer layer of plant tissue, humidity ceases to be the issue. You can kill the surface “powdery” part but it’s hard to kill the hyphae without a systemic fungicide. Copper and sulfur are more of a discouragement. It’ll come back and keep coming back until you either kill the plants and restart or apply a fungicide.
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But these plants never showed an infection
The powdery part is just the fruiting stage, conidium wanna say? Like any fungus, the “mushroom” aka what you can see is only part of the organism. The infection was there prior from the other plants. It must have passed to the other plants before you got rid of the obviously infected ones. If your environment is on point and there’s no infected plants around, it is hard to get.
So how do I know if my plants have gotten it? And theres no way of removing?
assume all plant material is infested and spray all plants with sulfur, it will exterminate it forever. Visually you will not see the mildew until the infestation is everywhere.
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He’s right. You have to assume everything is infected. I disagree about sulfur being a surefire curative, but either way you’re gonna have to do something proactive if you wanna kill it permanently.
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Ill try the sulfur. These plants are going outside so thats perfect breeding grounds…
I told myself to leave all these plants at my house and not to bring them over to the new spot where I had new clones sent. Now I feel like the new clones have gotten spores now too.
I have 90% what dilution in powder form should I aim for?
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make sure you nuke the mildew colony before moving it outside. Don’t want to risk spreading the pathogens. Probably 10ml per liter will brew up a good batch of sulfur juice. Test it on an unimportant area first and dilute it if it burns a hole in the leaf with acid. Careful getting any in soil it’ll leech the calcium.
spray once in veg and again 2 weeks later. My old weed dealer taught me that.
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This is powder from not liquid
Any PPE I should use?
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Use less than what they say on the package and spray a test area like joe said. I sprayed sulfur weekly or more for a couple months without issue then fried the shit out of my plants with it. I don’t know if I mixed it stronger or something, but keep in mind that it can definitely burn them.
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I never wore any but if you are concerned you can wear gloves and goggles. I’d recommend goggles for any project though. I didn’t get any burn on mine from the sulfur but some people have reported it can eat small holes in the leaves. @beacher 's story is definitely true, he lived it, and survived mildew free.
Edit: forgot I meant 10ml powder. A teaspoon would probably work too.
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here’s an article about mixing up the sulfur. They say 4 tablespoons per gallon.
https://homeguides.sfgate.com/make-sulfur-spray-pesticide-26954.html
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Will spray tomorrow. Hope it works.
Ive closed my operation down at my house while I do home renovations. So this came at a good time.
I brought what I had here to my outdoor location and waiting there until weather improves.
Also going to be growing at my dads while hes away for the summer. These will be from seed though cause id feel like a dick if I introduced PM to his room.
Should i be worried about grow equipment? I had planned on bringing a grow light.
If I bring the plants outside and spray. Will they smell still when brought inside?
sulfur stinks and it’ll stink for a bit mostly when the water is evaporating. Anything you are worried about you can wipe the surfaces down with some disinfectant. The mildew can’t survive on surfaces that aren’t the host plant, though. Like if I go and spray my plants down, there’s no mildew waiting on the ceiling to re-infest them. I soak the plants good, can’t leave an area where they could replicate.
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I too am waging a battle with PM. I took in infected clones. First time taking in clones and not ironically first time dealing with PM in my tents. I deal with it outside a lot (lemon balm, zinnias, lilac, lots of plants get it), but never had it in my tents. The clones were in a quarantine tent on a different floor from my flower tent. I didn’t realize it was in the quarantine tent until the first leaf spot showed up. I didn’t notice it was spreading within the first two weeks and moved the infected plant into my main rooms downstairs.
But the info in this thread and others is invaluable. I treated the quarantine tent with sulfur spray, twice now, and it appears to have stopped it completely. I did the same in my veg tent even though it was not obviously there. Unfortunately my flower tent was about 3 weeks in, so I didn’t want to spray sulfur.
Here is the one thing that has changed the battle for me, and I’ve not seen it mentioned anywhere. This little UV flashlight works wonders. The PM will fluoresce under this light and become easily visible. I used it to help tell the difference between PM and sulfur dust after the application in quarantine. The sulfur will not fluoresce. I then took the light into the flower tent for the first time. Even though I had not seen any PM on the leaves down there, once I shined the light in the dark I could easily see it creeping up stems, hiding on the underside of leaves, etc. Just like in the horror movie when they reveal blood streaks all over the clean walls.
https://www.amazon.com/gp/product/B00RV8PREI/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Getting that early insight has helped me in my battle in the flower tent, but I’m still 4 weeks out and not sure I have the fortitude to do this every night. I might just can the whole thing and start over. But so far treating the glowing bits with alternating H202 and LABS seems to be keeping it at bay. There’s always some to find, every day. But still has not shown up on the top of any leaf. Looking in from above you’d never know it was there, slowly infesting everything. One plant had to be culled because it was worse off than the others. And some plants seem to not have it at all…yet. Will I make it the final weeks? Probably not, but the light at least gives me a better sense of security than waiting to see it on top of a leaf.
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