Gnat Control

Never heard of the cinnimon method will remeber and try it.

A thin layer of Coffe Grounds on top of the soil works for me they do not like the acidity.

Originally Posted by personified

Never heard of the cinnimon method will remeber and try it.

A thin layer of Coffe Grounds on top of the soil works for me they do not like the acidity.

Coffee grounds are good for azaleas, blueberries, and other acid loving plants...not so great for cannabis. I ditched the idea in favor of cinnamon for this reason.

Originally Posted by del66666

the aspirin idea was first used on outdoor flowers, veg etc....all plants sprayed with and watered remained healthy and were more productive....i use neem a round 2-3 weeks into flowering so i dont get any attacks at the most important time......been using aspirin for a few months and things are looking good.

Clicks non-existent like button...ty again!

I have pulverized egg shell in my soil mix ( powdered in a blender ) works like DE. I also make an insectacidle soap that takes care of an outbreak. I'm oldschool like Jerry Baker lol.

2 T Garlic juice
1 T Habenaro juice
2 T Dawn dish soap
1 gallon water

Can be used as a spray on non flowering or a drench when in bloom

Captain Jacks Deadbug brew will get rid of Gnats, Spider mites, Thrips, Caterpillars and numerous other pests and it's organic. Stuff works wonders with one spray you can get rid of them all.

Originally Posted by Sunbiz1

TY for this and to the poster you quoted as well, that clears up a few myths.

Question for you/all.

What is the best top dressing to use for prevention?. Gnats LOVE the worm castings I've been using, I'm tempted to use coffee grounds and simply scrape them off when I bring them back in. Grounds are great 4/blueberries and azaleas, but most cannabis strains don't care for acid.

i use perlite to get effect use about a 1/2 inch on top of the soil stops the buggers getting down to lay there eggs, only thing is u have to water from the bottom to stop mold growing on the perlite, takes a little long but i dont mind

I had a gnat problem last grow, and I wasn't prepared for how fast gnats can go from a couple to seeing them flying everywhere. Even getting out of the grow room into the rest of your house which set off the alarm for me. I used neem oil with water to drench the soil. I was flowering, so I didn't spray the plant itself. I would've if I was still in veg stage. I also put a layer of fish tank rock over the dirt to keep the gnats that are flying around from being able to lay more eggs. I think sand is more ideal though, but the rock and neem oil worked for me. I also used mosquito dunks too.

The best way to prevent and get rid of gnats is with biological controls. Bti/Mosquito Dunks is a bio-control, and it does work fairly well for helping get rid of gnats but is better applied before you have any in the first place.

If you have a bad infestation you need to take multiple steps to eradicate them. Predator mites are the single best solution I have found. You can spray anything you want, drench your soil with neem oil, etc. and it will only work if you keep applying the stuff. You'll probably never completely eradicate them this way, and once you stop your gnats are just going to bounce back.

Predator mites like the Hypoaspis sp. are micro-arthropods about a millimeter or two large. They eat fungus gnat eggs, pupae and small larvae, as well as over a hundred other species of soil-dwelling pests. They play an important role in the soil food web essentially turning the gnats into fertilizer, shredding organic matter, shuttling and dispersing microbes. You can use them along with Bti and beneficial nematodes, although the mites may eat some of the nematodes.