Is this the start of PM

FlowerPower88

FlowerPower88

Well-Known Member
I have my Vpd dialed in, temp 79f RH 59%, if anything humidity dips just a fraction below veg Vpd guidelines, I have plenty of circulation around the plant. Any thoughts, tips, diagnostics…please
 

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FlowerPower88

FlowerPower88

Well-Known Member
What do you think could be the cause in those conditions, I thought it was stagnant humid air? If I go less humid the Vpd will be off…I have mammoth cann control so I’m going to do a good dollar spray just before lights off tonight. Anything else I should be thinking about?
 
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Astral22

Well-Known Member
Good luck with sorting it out. You can use the cann control.
Is it just that leaf? Careful not to shake the leaf around too much.

I suggest get few hygrometers and thermometers, place them strategically to cover all spots.
Not only 1 meter could be inaccurate, but also there might be wetspots and hotspots.
Right now i have 3 hygrometers in my tent, and i'll be adding a 4th one just because i have an extra lying around :D

Post a pic of the vents around the plant, you might need more if it's too crowded.
 
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waterproof808

Well-Known Member
Following a VPD chart wont magically solve all issues but your VPD is right on the threshold between low and healthy transpiration, depending on the chart you look at. They seem to all be slightly different.

how much does your RH/temp swing between lights on vs off?
 
FlowerPower88

FlowerPower88

Well-Known Member
waterproof808 said:
Following a VPD chart wont magically solve all issues but your VPD is right on the threshold between low and healthy transpiration, depending on the chart you look at. They seem to all be slightly different.

how much does your RH/temp swing between lights on vs off?
Click to expand...
I have been trying to keep it on the dry side of the threshold between veg and early flower.
RH probably goes up 3-5% and temp I try to keep consistant, no more than 2 degrees F
 
xtsho

xtsho

Well-Known Member
The cause is spores finding conditions where they can colonize and multiply. At this point your best option is going to be using some kind of spray. Lowering your humidity is not going to get rid of it and can actually cause more spores to be released into the air.

I don't grow by any VPD chart and I've never had PM indoors in decades of growing. It seems like many newer growers are just focused on charts and measurements. A simple preventative spray of neem in veg would likely have prevented it. But that's just too simple.
 
FlowerPower88

FlowerPower88

Well-Known Member
Astral22 said:
Good luck with sorting it out. You can use the cann control.
Is it just that leaf? Careful not to shake the leaf around too much.

I suggest get few hygrometers and thermometers, place them strategically to cover all spots.
Not only 1 meter could be inaccurate, but also there might be wetspots and hotspots.
Right now i have 3 hygrometers in my tent, and i'll be adding a 4th one just because i have an extra lying around :D

Post a pic of the vents around the plant, you might need more if it's too crowded.
Click to expand...
Thankfully this is the only plant in this tent atm, there is a floor vent next to the plant with a fan pulling air out and there is a top vent open with air coming in
 
FlowerPower88

FlowerPower88

Well-Known Member
PopAndSonGrows said:
Are these clones? They could've carried it already.

Do you have any PM-prone plants trees or grass outside? Do you go into your tent after being in your yard?

Are you just generally a filthy person? :lol: lol jk, trying to help "deduce"
Click to expand...
I don’t have any pm prone plants in the house for sure and none that I know of in the yard, I have been in my yard a bit the last few days and then in the garden and probably could have been more careful about going in the tent

it is a clone as well, I’ve had it for a little over a month though
 
FlowerPower88

FlowerPower88

Well-Known Member
xtsho said:
The cause is spores finding conditions where they can colonize and multiply. At this point your best option is going to be using some kind of spray. Lowering your humidity is not going to get rid of it and can actually cause more spores to be released into the air.

I don't grow by any VPD chart and I've never had PM indoors in decades of growing. It seems like many newer growers are just focused on charts and measurements. A simple preventative spray of neem in veg would likely have prevented it. But that's just too simple.
Click to expand...
I have the spray but thought maybe best not to use it until needed, I guess that’s an everytime kind of thing
 
FlowerPower88

FlowerPower88

Well-Known Member
I have a warm mist humidifier close, not on top of it but within 18”, should I change it to the cool mist setting? :confused:
 
FlowerPower88

FlowerPower88

Well-Known Member
Herb & Suds said:
I would turn it off and increase airflow
Click to expand...
Yes. I was thinking of turning the fan up…it is only on 2 leaves that I can see and very little, at least as of a few hours ago, idk how fast this can spread, what I’m getting at is, is the plant at risk of dying just because it has it, or treated early on is this a manageable problem…I need like one of those %’s that dr.s give before they operate lol
 
thumper60

thumper60

Well-Known Member
FlowerPower88 said:
What do you think could be the cause in those conditions, I thought it was stagnant humid air? If I go less humid the Vpd will be off…I have mammoth cann control so I’m going to do a good dollar spray just before lights off tonight. Anything else I should be thinking about?
Click to expand...
What you spraying?
 
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