Powdery Mildew! Please help me save my crop! Help!

Just now I noticed an infestation of powdery mildew in my grow tent today. I believe it must of come from some vegging plants in the closet nearby, which I thought I had eradicated.

Here's a picture of the underbud that I found with the infection:

This is a really severe example, but its the one I noticed. I don't think there are any other leaves that look that bad, but it seems it has spread nearby. I have REALLY good air circulation, but when I put my hand where this bud was, it did seem like there wasn't enough for that specific spot. The most humid it ever gets (even under the canopy) is 43%. With lights on its 29% humidity at the top of the canopy.

None of the other buds show any sign of PM, but I don't want to wait for them to get infected. I am 5 days into a hydroponic flush, and the leaves are just starting to really yellow off and die.

What should I do?

Should I go through and take out every fan leaf thats close enough? Thin it out? Add more fans, and hope for the best? Or should I crop now? I was really hoping to get a 2-week flush in, not just 5 days.

hit it with some 3% peroxide.....retreat as needed...spray during morning light so the bud can dry

dude you have mites

look under the leaves if you see black dots or little white bugs you have mites.

if its pm mix up milk and water and wipe down the leaves with a sponge. also if you make a habit of burning sulfure in your rooms your plants will stay healthy. you can buy a sulfure burner at the hydro store for 100 bucks

MrStickyScissors said:

dude you have mites

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what makes you say that?

bottletoke said:

what makes you say that?

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no doubt there is powder milder. but some of the white spots look like mite damage. could be wrong but iv been doing this for a long time. and just from wat iv seen it looks like theres some mite damage

most people wont even know they have mites tell there are webs

and then on top of that alot of people wont even see the webs tell all there plants are webed

i blew that up on my computer ..dont see mite or marks on the leaves...but your pm is spreading

I just harvested the entire crop: I didn't want to let it spread!

I was pretty sure that it wasn't there for the past few days that I had been looking at them so not sure how long it'd take for them to really take hold. Harvest wasn't very bad, that leaf was the worst I've seen yet, and about 99% of the leaves don't have it on it, and if they do, its not too bad.

None of the buds visibly had anything on them, but the buds were so crystally I couldn't tell anyway.
They are drying now in a closet with a LARGE HEPA filter running, along with a smaller one. I'm hoping that'll prevent the spores from taking hold, and that I'll be able to cure them without any PM. They all seem fine right now.

Went ahead and harvested them.

The spider mites notion is definitely not true. But I'm still very worried about the PM. It was only that bad on THAT leaf, otherwise, the whole crop is pretty healthy looking. There are no buds that visibly have any PM on them, and I even broke open some buds to find out, and there's no fungus of any kind that I can see. I'm thinking the PM wouldn't have spread to the rest of the plant, cause for the most part it was isolated to parts of the canopy that didn't have a whole lot of airflow despite the rest of the canopy being more than adequate.

So with the buds carefully checked for PM, and all are now hanging, trimmed, in a closet with 2 HEPA filters, and a carbon filter running, will I still run into issues with this Powdery Mildew?

Here's a pic of a bud I just trimmed:

next time use 1 part milk to 9 parts water.
this is the method the big agricultural growers
use all the way up to harvest. completely
safe and works perfect.

yeah i use the milk to water. but i dont measure it. some milk and water

i wasnt saying you had spider mites for sure. just seen something that looked like mte damage or the start of it. just trying to help you out. if you want to get rid of your pm get a solfur burner.. simple

rookies these days.. and he trimed it wet

yeah don't see any mite damage and I cleaned out someone's garden who had a mite infestation so I know what those nasty little fuckers can. Also once you have one mite you'll have 10,000 plus the next day just because of how fast they reproduce.

also I've never had issues with PM really, so what is this sulfur burner you talk about? sounds interesting.

Confucious said:

also I've never had issues with PM really, so what is this sulfur burner you talk about? sounds interesting.

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hahahaha.... if you love the smell of rotten eggs /sulfur farts...... get a 40 watt desk light.... place a can over top the bulb..... sulfur on the can.... there u go

MrStickyScissors said:

rookies these days.. and he trimed it wet

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Who allowed you to be a moderator? Go troll somewhere else... and learn to spell.