powder mildew? help from smart growers?

[organicmedicine]

Hi guys,

new here - I have some clones that I just received that have a bluish-gray staining on some of their leaves. is this powder mildew? or is it potentially some type of treatment that the cloner sprayed on there early on?

any help with this would help - pics below

organicmedicine Reviewed by organicmedicine on 06-24-2010. powder mildew? help from smart growers? Hi guys, new here - I have some clones that I just received that have a bluish-gray staining on some of their leaves. is this powder mildew? or is it potentially some type of treatment that the cloner sprayed on there early on? any help with this would help - pics below Rating: 5

[Weezard]

Powdery mildew is systemic, so once it's visible the whole plant has it.. IMHO not even worth trying to salvage these plants unless they're irreplaceable..:rastasmoke:

Sad to say, I agree.
Most of it went into the bubblehash bag.
You can wash off the PM bloom, but the actual infection goes allaway to the bone.
There are systemic poisons that will kill PM, but I'm not keen to smoke them either.
At least the hash extraction removes most of water soluable component.

Thanks for the input, guys.

Aloh,
Weeze

[Weezard]

ideal growing conditions for pm are temps below 70 and rh above 60. Big temp drops from day to night will cause dew and promote PM growth.

BUT, once you have it, those thresholds are out the window. Taking RH down to <40 and having temps >80F help allot. You'll want to be pushing some CO2 if you are going up to that level with the temps (tops at 85F w/1500ppm)

Weezard - is it a strain (different seeds, distinctly different grows),

Different strains..

or cuts from the same plant? If cuts off the same plant, you may be spreading a latent infection from the mother plant - use some eagle 20 and break the chain if you need to save genetics. Certain strains are more prone to PM than others - strains with tons of foliage like blueberry are more susceptible.

Oddly enough the G13-Blueberry has no PM problems.
The lemon-skunks were ravaged, and I only managed to save some tops from HI Homie-III by harvesting early.

If this is the case, and you are having big temp drops or nighttime temps of below 70, it's important that you prune a bunch and/or shake the plants daily to release water trapped between leaves.

Runs between 82F. by day and 68F. by night this time of year and we seldom hit our dew point.
And they really are not that dense. Fairly open, and I have them roofed so the don't even see rain.

Try it. Go out and grab your tree by the stalk and shake. Does water fall when the plant otherwise appears dry? If so, you need to prune.

Nope, but it does annoy the whitefly.
It's their "nectar" that supplies a landing spot for drifting spores.


PM is a mutha.

Indeed! It's rampant on da islands.
I've read reams from all sources and they all agree that once infected, the outlook is grim.
('druther risk smokin' some PM than some of the stuff used to kill it.)
It looks like my only option is to breed my own PM resistant strain here.
I've got ahold of some Gainsville Green seeds that survived in Florida and want to cross them with the blueberry that grows so well here.
Any suggestions on breeding stock?

Aloha, and Mahalo
Weezard

[copobo]

if you are gonna smoke it, you can certainly wash it before drying/curing. PM does wash off.

it is a mutha!

I would go with what works for you in your area. the sativas seems to be more resistant to me. if the bb-g13's hold up. do more of that and drop out the ones prone to mold.

[khyberkitsune]

I don't know that to be a fact, sir.

Got a strain here that gets PM when da buds swell up.
More correctly, they get PM whenever, and it "blooms" when they swell.
Got more light and ventilation than you can shake a stick at here, (Kona Coast).
Night time temps are high 60s, but the humidity can be fierce at times.
Got another strain, growing in the same cage that never shows PM.

Jus' a few more facts to mull.
Draw your own conclusions.

Aloha,
Weezard

Noted. I've personally seen PM attack many of my landscaping clients out here in the high desert, even at sub-20 RH.

[khyberkitsune]

if you are gonna smoke it, you can certainly wash it before drying/curing. PM does wash off.

it is a mutha!

I would go with what works for you in your area. the sativas seems to be more resistant to me. if the bb-g13's hold up. do more of that and drop out the ones prone to mold.

PM permeates the entire plant, from leaf to stem, at least in the decorative flowering plants I planted last year over in southern Los Angeles for a hair salon.

Took about a week and PM all over the place.

[funkfingers]

Powdery mildew is systemic, so once it's visible the whole plant has it.. IMHO not even worth trying to salvage these plants unless they're irreplaceable..:rastasmoke:

[SoCoMMJ]

Also consider a product called Oxidate for PM during flower or simply use water adjusted to a pH of 10 using common pH UP and spray daily until it's gone.


it works.

Or if you wanted to use a commercial product that raises the PH and includes a nice sticker spreader...
GreenCure

Potassium Bicarbonate. I used it at 1/2 strength and it works fine.
hit everything in the room.

There is a PM thread somewhere on here that talks about it

[funkfingers]

I wouldn't mess with clones that came with pm pitch them..The idea is to never introduce pests/diseases into your grow..It will make your life easier in the long run.

[HarvestHouse]

Also consider a product called Oxidate for PM during flower or simply use water adjusted to a pH of 10 using common pH UP and spray daily until it's gone.


it works.