Gnats near harvest/washing buds

Hey all. Been hit with a bout of fungus gnats again. Had a small infestation about a month ago, knocked them down to next to nothing, but they're coming back with a vengeance as I'm heading into the last 2-3weeks of flower and this time my IPM is not having as much effect in them.

Actions taken: I've been doing soil drenches every few days the past week with neem oil and sulfur dust. dusting the surface with diatomaceous earth and very carefully, to avoid the buds, misting the medium surface with neem and insecticidal soap mixture. Yellow sticky cards around and in every pot for the adults. Also tried applying Pot Popper predatory nematodes a week ago. Still can't get rid of them and seems as bad now as a week ago.
I'm growing in coco so I need to water at least once a day, hence the medium stays damp, which obviously is part of issue breaking the cycle. I want to be giving them a frequent fertigation schedule and have tried to let the medium dry as much as I feel safe to do. The top 2-3" of coco/perlite is bone dry after 24hrs, but the gnats are still surving in the drainage holes. If I let it dry out more it will surely harm the root system.

What to do?

I'm getting desperate at this point. I've heard mixed opinions on using hydrogen peroxide. Also heard mosquito dunks can work, anyone tried this in coco?

Another issue is I'm in Canada and do not have access to gnatrol or Hydroguard it seems, which would have been my first choices.

Thoughts? TIA

P.s. after this I'm thinking i want to wash my buds after haverst, not a water cure but just give them a rinse to try to remove any gnats and bug shit or whatever before hanging to dry. Anyone else do this? Is this where using a little hydrogen peroxide might be an idea?

Instead of the neem oil try using mosquito dunks. They work like a charm. And keep the yellow traps up. If you can see gnats on the buds with the naked eye maybe wash them... but if you think of it this way when you grow outdoors you'll always have small bugs in your buds that you dont even see or realise and they get smoked. So unless its really that bad.. id leave it

Mosquito dunks will also work as prevention and is natural and harmless to your plants and yes theyll work in coco. Theyll work in any medium id steer clear of peroxide on buds.

OrganicBudz said:

Instead of the neem oil try using mosquito dunks. They work like a charm. And keep the yellow traps up. If you can see gnats on the buds with the naked eye maybe wash them... but if you think of it this way when you grow outdoors you'll always have small bugs in your buds that you dont even see or realise and they get smoked. So unless its really that bad.. id leave it

Mosquito dunks will also work as prevention and is natural and harmless to your plants and yes theyll work in coco. Theyll work in any medium id steer clear of peroxide on buds.

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Ya I've heard the dunks work well, thanks. going to order those asap. Heard a lot of mixed opinions on the peroxide, still tempted to try, just want to go nuclear on the little fuckers lol. Would a flushing agent maybe be a safer bet? Those mainly wash out salts right, so not sure if it would wash away larvae/eggs...but I'll start with dunks...

WintersBones said:

Ya I've heard the dunks work well, thanks. going to order those asap. Heard a lot of mixed opinions on the peroxide, still tempted to try, just want to go nuclear on the little fuckers lol. Would a flushing agent maybe be a safer bet? Those mainly wash out salts right, so not sure if it would wash away larvae/eggs...but I'll start with dunks...

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The dunks will kill all the larvae within minutes after watering. Just make sure they soak in the water for a good while first

God damn it. so I finally got those gnats under control and now I find what i think are thripes on a bud leaf! Ackk!

Cut the leaf out, only one affected that I can find, but there's surely going to more right? I have an insecticide that's supposed to be safe on fruits and edible foods, would that be ok to spray on the buds? I hate the idea of spraying the buds with chemicals but I don't want to be chasing another infestation as my plants near to ripening.