Hello; need some advice on how to treat this fungus or mildew so close to harvest.
This is one of the 5 outdoor grow Blueberry Fem plants. We, as many in Mid-west US ,have been through a long high humidity summer.
Only one plant has this issue and it’s the plant closest to harvest.
Please advise: which fungicide, if any, at this point to treat. And possibly prevent the same on the other 4 plants.
Conditions are much more dry since the end of August and expected to remain dry for the next ~1 week.
Dilute hydrogen peroxide and water is the easiest and a safe option (as opposed to using a fungicide.)
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@MidwestGuy thanks brother! You’ve obviously dealt with this before - same conditions up the HWY from you.
Please recommend a ratio H2O/Peroxide.
In addition to the peroxide You can also defol some of the biggest leaves to help with some more air flow as well.
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I would do 50/50 as a spray to treat existing mold and then 25/75% (peroxide/water) going forward as a preventative.
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Damn 50/50? Okay - I’ll make it happen.
Thanks man!
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You could probably do a little less, but it’s hard to hurt a plant with peroxide unless you are putting it in your soil. Putting peroxide in soil is not recommended, as it will kill off the microbes in your soil.
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If/when you remove any of those leaves spray them down first it will help to keep it from becoming airborne.
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Should I spray liberally - leaves and flowers?
I intend to cover the soil before spraying.
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Yes. It’s not necessary to completely soak them. It may take a couple of applications to rid of the mold.
Be sure to spray just before lights out so you won’t have to deal with water droplets creating light burn of your leaves. Water droplets can act like little magnifying glasses.
Droplets burn even mature plants - well how about that!!!
It’s teaching-Tuesday!
Thanks MG
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Any plant. The reason you don’t hear about it much among mature plants is that most people tend to shy from spraying mature plants with anything (unless they are in your situation.)
We see quite a few mold problems growers are having this time of year when humidity is naturally higher, especially in the south and the midwest.
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No they don’t.
I’ve seen this article before. I stand by my statement.
Even though it’s demonstrably wrong? That makes no sense.
I mist my indoor plants twice a day. Usually about 10 am and 3 pm.
No burns on these.
Maybe it’s because I start them young.
It’s just not true and I wish people would stop saying it. At best it is fearmongering and we have enough to be worried about…
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That’s quite a statement to call it fearmongering. There are a lot of cautionary statements that all of us give freely many times each day and it’s the first time I have heard a suggestion of fearmongering.
The article’s author seems to be making an argument about whether or not water beads and less on whether or not such beads can cause burning. I base my statement off of the number of growers we see here who have indeed induced such burning by spraying. We don’t see it often, but it does happen.
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@oldmarine and @MidwestGuy; I too have heard both sides of this discussion but more related to general Lawn care etc…
Could it be that where City “tap water” is used, which typically has a high concentration of Chlorine, one would face the potential of a chemical burn as opposed to sun magnification burn?
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I’m aware that people sit out their tap water to gas off chlorine, but I’m not smart on what problems chlorine can cause. I suppose it’s possible.
Never. That’s how often it happens
From the article:
“The accepted wisdom has been that a water droplet sitting on a leaf would act like a tiny magnifying lens, and by focusing that sunlight would produce scorch marks and burns on the innocent leaf.”
Also from the article:
“Burning a leaf with a water droplet does not happen on a smooth leaf, and is just barely possible on a hairy leaf.”
To be clear, you are afraid to mist your plants because of a lie.
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Men, I’m still experiencing Powdery mildew on these. Hydrogen Peroxide/H2O 60/40 ratio not taking care of the problem.
I’ve been removing significantly affected fan leaves.
It’s been reasonably dry with only daily AM dew.
Not sure what to do about killing this stuff.
Separate question: Are 3-leaf leaves, as opposed to big 5/7leaf growth leaves, also considered “fan leaves”?
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