FUNGUS GNATS

my 3 step ways to get rids of fungus gnats .... 1st sticky traps will take care of the reproductive flying one 2 nd put cinamon stick in your pot, and/or add few drop of cinamon essencial oil in your feeding water, will work as a natural repealant, ( it will reduce the population, but not get rid of them) also it smell good 3rd the final step required some mosquito bits witch is BTI (Bacillus thuringiensis israelensis) essencialy a microbial insecticide that will kill the larve. make some tea with it... using this proportion granular form 1tbs by litre of warm water lets infused for 12 hour donnut form 1/4 of the donnut for 4L warm water , lets infused for 12 hour

Get some Pot Popper Nematodes and follow directions. Put a fan blowing on the surface of the soil , and get some yellow stickies. You dont need to replace soil.

Nematodes and a layer of quartz sand worked wonders for me

No need to throw away just let it bone dry somewhere nothing survives without moisture.

You can also water with neem oil or mustard seed extract to kill the larvae immediately, but be careful its potent stuff, you can only use it on the soil surface as it will kill most of the living microorganism it touches, also the good ones and ive heard people say using too much of neem/too late in flower can make you buds taste like neem oil Hypoaspis aculeifer is another predatorial mite that works against fungus gnats but i think the other one is better. Freezing soil will also work nicely to prevent having larvae to begin with. Good luck!

Agree with what the others said, add sticky traps and use bti/nematodes. Cover the Soil with a thick mulch, sand or coco mats are good. Also you could get some predatorial mites, you can buy them online for some pocket money and they will stay for months, reproduce if they find food and have a preventive effect on fungus gnats and thripse! You want to get the species "Hypoaspis miles"

Don't replace the soil, treat the soil. Re potting will affect the plant in a negative way BTi or Nematodes work great. I've used both before and I prefer nematodes but lots swear by BTi DE is not effective when wet and needs reapplication its also a powder and clogs filters, not great to inhale. Yellow/Blue sticky traps are only effective at capturing adults but does not prevent or stop the breeding cycle. they can still mate and lay eggs then get caught. not solving anything. better for monitoring the room if any pests are getting in. then use BTi or nematodes to kill the life cycle in the soil level. Good Luck!

When I had a really bad problem with gnats, I found it was related to my watering habits. I kept the soil wet and they were multiplying like crazy. All I did was change my watering habits to let it dry out more between watering/feeding. Also I put a small bowl full of water in the tent with a drop of dish soap on top. The gnats will drink themselves to death and the soap keeps them from flying away. Just another option and worked for me. Only have occasional gnats here and there ever since. Best of luck! Happy Growing!

Fly traps and usw hover to clean the tent of em each time you open, few weeks of this and they are gone. Next time use vetter soil manu or freeze soil before use.

I've rinsed soil from a root system then re-planted. High chance you shock the plant, but it should recover. However, with an autoflower it may not be a good option. You'd have to hope it delays flower or it'll pretty much ruin your outcome with a very small yield relative to time invested (already a risk if you have a bunch of larva chomping on the roots). Bti is an option, along with some stiky traps. Bti will kill the larva. It'll take 2-3 weeks to control a dumpster fire of gnats. Bti can also be used pre-emptively. Gnats usually come in with the soil you buy, unless this is outside. Obviously outside, is different in this regard, but it's really hard to get gnats indoors without them traveling in with the soil that is used. Anyway, mosquito bits and dunks (for reservoirs) are great to use from the start of a grow to eliminate the concern of gants and anything else that lays larva in the substrate. brand may be different in other regions of the world, but it is always "Bti". It's a microbe. It's been used on our food crops for over 100 years, if notmistaken. it is safe. Now, it is an autoflower, so it's possible the stress causes it to flower faster. It's also possible this stress delays flower too... cross your fingers for the latter to be true. extra info - adults (the ones flying around) don't damage the plants. they are just annoying and reproducing. so, sticky traps kill from other end of life cycle, so there's definitely a benefit from doing both together. however, traps are not effective on their own. Bti can be effective on its own by comparison.

diatomaceous earth and yellow sticky traps. I don't recommend changing the soil of your auto.

Covering the surface of your soil with something that drys out quick would be a good solution. The gnats breed in the first few centimeters of growingmedia/soil, they need high moisture/humidity to do so. You can cover the soil with perlite, or sand and they can’t multiply anymore. In your local hydroshop/Growstore they might even have some special Silicat sand, the gnats hate this topping the most because of the sharp edges from sand particles. There are also beneficial Insekts like nematodes that can be used, they eat the fungus larvae. Yellow cards might be also a good idea to monitor and kill the ones that come out of the growing media. You can replace your soil if you want to she’s still in veg and can deal with the stress, but without the precautions above, the fungus gnats will come back.