Battling against Gnats & Powdery Mildew 4th week of flower

I could use some advice from you guys.
I have fungus gnats and powdery mildew going on in my grow room and want some ideas on how to get rid of them.
Im in 4th week of flower so some of the neem oil and some other options are off the table i guess.
Regarding Mildew - I have used sulfur vaporizer 2 times in the past week and i think its helping.
Regarding Gnats - Got some sticky yellow traps around the clay pebbles and its catching some of them but need help on how to eradicate them.
I did a lot of research here on the forum and seems like the main go to are h2o2 or mosquito bits.
I am currently trying to run a sterile system by adding about 120ml of 35% h2o2 for about 65gallons of water on every water change( 7 days ) and adding 60ml every 3rd or 4th day until next water change.
Should i make some concentration and pour it over the base of the plants with h2o2 or go directly to the mosquito bits way?
Its very bushy and i didn't anticipate this big of a growth so my access is pretty limited between the row.

* Does anyone have experience with mosquito bits and if so how would i use it in RDWC system?
* Any suggestions on how to eliminate white powdery mildew?

System is 20 grow sites , DIY RDWC system
here are some pictures of them at this stage - taken today

Keep running your sulfur burner you need to get your vpd in check. Remember the environment is what causes the mildew and get as much air movement as you can. Throw some fans on the floor also and for the fungus gnats. I usually cover my buckets/rocks best you can duck tape or whatever and put tanglefoot around the stem so they can’t go in and out your root zone.

I thought using a sulfur burner was a no-no in flower?

Jdubb203 said:

Keep running your sulfur burner you need to get your vpd in check. Remember the environment is what causes the mildew and get as much air movement as you can. Throw some fans on the floor also and for the fungus gnats. I usually cover my buckets/rocks best you can duck tape or whatever and put tanglefoot around the stem so they can’t go in and out your root zone.

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Thanks for the input.
question about the sulfur burner, do u know how often i can run it? twice a week 3 times a week? also at what stages of flower is it ok to run the sulfur burner?
Also whats a VPD?

Darknes01 said:

Thanks for the input.
question about the sulfur burner, do u know how often i can run it? twice a week 3 times a week? also at what stages of flower is it ok to run the sulfur burner?
Also whats a VPD?

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I would run it as necessary you can run it 5 times in a week if the mildew trying take hold. After like 3 days I usually see the leaves that are infected get better. Vpd read up on it it’s the plants internal pressure vs the environment you can pull charts online. When plants aren’t in sink with their environment mildew and other things can come about. Sounds like need more air flow though.

Darknes01 said:

also at what stages of flower is it ok to run the sulfur burner?

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I would only run it during stretch unless you want buds that smell like cat farts when you burn them.

Make sure to turn off ALL fans, dehumidifiers and whatnot when you run the sulfur vape, and wait 30 minutes after lights out. Then don't apply any foliar stuff or the sulfur can create sulfuric acid on the plants. Also cover any CO2 sensors or sensitive stuff. LED lights react poorly to sulfur vapes too so if you have them pull them out of the room.

Gnatrol is the way to handle gnats. Mosquito dunks and Microbe Lift BMC also have the same ingredient. It's a bacteria and it's safe in flower, just mix with the water.

Renfro said:

I would only run it during stretch unless you want buds that smell like cat farts when you burn them.

Make sure to turn off ALL fans, dehumidifiers and whatnot when you run the sulfur vape, and wait 30 minutes after lights out. Then don't apply any foliar stuff or the sulfur can create sulfuric acid on the plants. Also cover any CO2 sensors or sensitive stuff. LED lights react poorly to sulfur vapes too so if you have them pull them out of the room.

Gnatrol is the way to handle gnats. Mosquito dunks and Microbe Lift BMC also have the same ingredient. It's a bacteria and it's safe in flower, just mix with the water.

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I think the catfarts part scared them off.

If you wanna put a stop to PM, regardless of flowering or not, an AirROS machine is the way to go. Stop it dead in it's tracks with zero negative effects on your plants or terpenes.

Renfro said:

If you wanna put a stop to PM, regardless of flowering or not, an AirROS machine is the way to go. Stop it dead in it's tracks with zero negative effects on your plants or terpenes.

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where could i buy one of that ? looks interesting but cant find where to buy it from.

Darknes01 said:

where could i buy one of that ? looks interesting but cant find where to buy it from.

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Renfro said:

Home - AirROS Agriculture

AirROS is an industrial surface and air purification system that kills mold, bacteria, viruses including e-coli, salmonella, norovirus, ethylene gas plus odor control.

www.airrosbysage.com

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thank u , ill give them a call tomorrow and see if i can get pricing. Hoping its not too expensive.
also regarding gnats, i ended up putting sticky tapes under each tree and got mosquito bits, just put some in the rez in a sock and hope this gets rid of them for good.

Darknes01 said:

thank u , ill give them a call tomorrow and see if i can get pricing. Hoping its not too expensive.
also regarding gnats, i ended up putting sticky tapes under each tree and got mosquito bits, just put some in the rez in a sock and hope this gets rid of them for good.

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Mike is a good guy and can help you size a unit for your room. Their smallest unit will run around $3200 - $3300 if I recall correctly and is good for 2000 cuft.

Have you heard of airoclean420?
I wonder if it's the same thing?
They have units starting from $999

It doesn't produce any hydrogen trioxide / trioxidane and therefore can only sterilize the air, but the surfaces the air touches. I doubt it would be as effective but you could always give it a try I suppose. Perhaps give them a call and then call Sage and see what you come up with.

The AirROS products are used in places like hospitals and pharmaceutical manufacturing facilities where sterilization of the surfaces is of the highest importance. I am confident in the effectiveness of the AirROS products.

Renfro said:

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It doesn't produce any hydrogen trioxide / trioxidane and therefore can only sterilize the air, but the surfaces the air touches. I doubt it would be as effective but you could always give it a try I suppose. Perhaps give them a call and then call Sage and see what you come up with.

The AirROS products are used in places like hospitals and pharmaceutical manufacturing facilities where sterilization of the surfaces is of the highest importance. I am confident in the effectiveness of the AirROS products.

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Ya I will call them for sure but just to let u know airoclean420 also has non of the things u mentioned, im pretty sure they use a uv light or something like that to sterilize the air ( just wanted to put that out there lol - i dont work for them or care for them )

Darknes01 said:

Regarding Gnats - Got some sticky yellow traps around the clay pebbles and its catching some of them but need help on how to eradicate them.

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You are using clay pebbles, in an ebb and flow? If the top of the pots stays dry, could you sprinkle "food grade" diatomaceous earth on top to kill adults entering the root zone or larva emerging?

Cabrone said:

You are using clay pebbles, in an ebb and flow? If the top of the pots stays dry, could you sprinkle "food grade" diatomaceous earth on top to kill adults entering the root zone or larva emerging?

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Oh my system is not ebb and flow it's RDWC

My understanding of a RDWC is limited. Don't the top 2-3 inches of pebbles stay dry?