I think I have about 4 weeks left of flower before harvest starts, I’m noticing little spots of what I’m thinking is powdery mildew starting, can I please get your opinion and best methods to solve said issue, thanks.
Temp is usually right around 25c with lights on and 47 rh.
The white spots on the leaves rubs off so far I’ve only noticed it on the top of the leaves. Thanks for your help in this issue.
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It does look like powdery mildew but I’m not sure about the brown spots.
How long till harvest? That will dictate your course of action.
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I’ve been fighting it this last grow and have had good luck doing sulphur burns followed up with baking soda water sprays .Get some air movement and watch your humidity also thinning some of the fan leaves will help .
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Can a sulphur burn be done inside in a tent? I did it in my mini fridge but that was outside
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I would think so might stink up the place for a bit but doing a short 2 hr burn does wonders on mildew .
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Can they still be sprayed with safers mold spray?
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If you were 2 weeks out I’d say live with it and remove any and every leaf that shows signs. This will slow it down but not stop it.
At 4 weeks I think you’d be best using some sort of topical agent. I’ve had success with baking soda/water but start at a very weak concentration. I’ve heard of commercial products and hydrogen peroxide but have no experience with them.
The real question though is what is the cause. Does your humidity skyrocket at night?
I can’t say about the Enders mold spray.
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Good tip with the baking soda. I’ve got a bit of pm in my veg room and have been using diluted apple cider vinegar (read about it online), and it doesn’t seem very effective.
@ShiskaberrySavior what does the process of a sulfur burn entail? I’d love to nuke this stuff out permanently.
@5stonedgnomes as Foreigner said take off any leaf that has it even in if you’re not quite sure. This will help slow it down and open things up for more air flow and light. If you have any spare fans get them in there blasting 24/7, especially low down between the canopy and soil where this stuff thrives.
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Here’s my set up simple and effective
I’m fortunate enough my son hauls sulphur so he brought me a large ziplock home from work
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You DO NOT want to spray sulfur on any flowering plants
Zeratol can be sprayed on flowering plants every other day to keep pm at bay
Pm spores are everywhere. Shitty grow environments( no air flow, humidity spikes) help pm develop.
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I was under the understanding as long as you’ve got 3/4 weeks of bud left as long as you spray with water after a burn that you’d be ok ?
Is this wrong information ? @grief
Yes that’s wrong. If you make concentrates the sulfur makes it taste horrible (if sprayed anywhere in flower).
You need to treat with sulfur in veg then wait two weeks to put into flower. Then if you get problems in flower you need to use something else depending on the situation
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If you get Eagle 20 now, you can cure the PM in a day. Just give it a month before you harvest it and you’ll be fine.
Crunchy types hate it, but it actually works as long as you use a little common sense, it’s totally safe.
Adjust your parameters, get more airflow next time. Happens to the best of us, I had a few spots this last harvest where the plants were crowded together.
PM is the plague, treat everything in your stable with Eagle 20 as a prophylactic measure.
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I agree it’s maligned, and has its place, but think hard about using Eagle 20 for more than a one-off treatment. If you have to keep mothers from plants infected by PM, then Eagle 20 is the only way (I know) to kill off the systemic aspects of PM.
Please do not use Eagle 20 as a prophylactic.
Why not?
The PM that survives Eagle 20 application(s) becomes more resistant, and harder to kill, for everyone.
I’m not suggesting spraying randomly or intermittently every cycle, just when you have a flare up of PM, it is reasonably safe to assume everything is contaminated, Those spores are everywhere. So even if your other plants are asymptomatic, it is best applied as a prophylactic measure, if you have an active infestation anywhere in your grow space.
I do agree, though, it is a powerful and effective tool best used judiciously.
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Haha eagle 20 stays in plant tissue for YEARS. Do not use that poison on your medicine. Don’t even have a bottle of that stuff anywhere near your home.
PM is an obligate parasite. It is not systemic
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What do you use for pm?
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Learn something new every day. It certainly seems like a systemic, but it’s easy to see how bias informs that perspective rather than scientific analysis.
A little search kicked this up:
And, in the absence of evidence to the contrary, I’m inclined to believe it.
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Sulfur burner, though I haven’t used one in years.
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