Dealing with Fungus Gnats in a Hemp Grow



A quick guide on how to control fungus gnats in your hemp grows. Like the content? Then check out The Absolute Beginner’s …

39 Comments

  1. Sorry to bother im struggling to keep pest away i was told perlite but saw others said perlite is bad for my plant everywhere says different things but i dont want it to be harmful ive seen neem oil, essential oils, cinnamon and insect pesticides, pyrethrum and DE all bad with side affects. Whats okay and as long as its in vegatative stage i can apply these? Or non at all .Thank you All help is greatle appreciated.

  2. there are holes all over soil bags, the gnats (probly at the nursery)go in these holes and lay eggs. ALL of the products to kill them are a feeble attempt at getting rid of them! I have dealt with them twice now and I bought ALL of the products but did not 100% get rid of them until I removed ALL soil from my basement where I grow weed. I poured 1/2 gallon of bleach water around the floor drain (they love those) and all soil has been gone for 2 months and no gnats for weeks now. I decided to buy promix dry soil that has NO HOLES in the bag and add my own nutes. I think that will work.

  3. Mosquito bits. Make a tea with the granules dont sprinkle it over the soil. I put the granules directly into a gallon of water and let it sit for 24-48 hours. Strain out the granules and ph the water. By the third watering you should notice thereā€™s very few or none left.

  4. The flying gnats are detrimental they can spread disease from leaf to leaf I know the larvae is what attacks the roots but the flys themselves can and will spread disease from plant to plant etc.

  5. I use womens tights around the top and bottom of my conservatory pots, cut a hole in the top for the plants stem and place a loose tie around the stem as to not interfere with future growth, they cannot get into the soil at all and you can water and drain as normal. My conservatory door is open most days in the summer and I have never had a fungus gnat problem since doing this I am guessing it would work for this kind of plant as well.

  6. Peace, I used a whole bottle peroxide n there are more šŸ˜‘ I feel so bad for my girl and its affecting my other younger plant, I fxcking hate them . Nasty bugs str8 up

  7. Careful with the neem!!!! Tried that first. If it touches fan leaves at all itā€™ll burn them. But it did slow the gnats down a lot, Iā€™m trying the hydrogen peroxide drench tomorrow

  8. The flying gnats exist only to breed. It's their larvae worms in the soil that can damage. As soon as you see flying gnats, kill them. Use Fly Paper. Keep a vacuum handy and vacuum them away. Keep them from breeding and making more.

  9. stop recommending hydrogen peroxide to people. It does nothing to the larva and will wreck your microbial life if your doing living soil. It's completely ineffective in the grow room and it just goes to show how you don't do your research. There are videos where people soak larva in hydrogen peroxide and it nothing happens to them. You've probably damaged people's grows now cause of this.

    edit: how to actually get rid of gnats –
    get some "mosquito bits" organic and completely safe. after a week your infestation will just be just a couple gnats. Use with sticky traps and water with the mosquito bits once a week and you'll have no issues. Covering the top with really fine perlite works great too

  10. Hey man could really use your advice on my plant could we chat sometime itā€™s either really sick or something happened but itā€™s so close to being done and I donā€™t want to lose it

  11. I had the best results with nematodes, that are the natural enemy of the fungus gnats larvae. There are 2 companies in my area that sell them as live worm eggs, one with a cold pack the other without, so they don't hatch in the packet in warm weather. The best thing about this is, that if you grow organically it still is organically, because you use no poison. Of course waiting for the natural enemy to appear on their own after some time would be even more permaculture-ish <3, but it is nearly impossible in such unnatural conditions as an indoor grow.

  12. I've tried all this shit and can say the best method is PREVENTION. Don't bring new plants into your space from outside unless you quarantine them first. And the top layer mulch is the best thing to quell their high reproduction numbers.

  13. LOOK HOW GOD WORKS! Stared seeing these little bastards a few days ago buzzing around my plants thinking they were regular gnats flying in smelling this sweet sweet flower. And BOOM! This video drops?! Thank you dearly for this information and all of the other very useful information that this channel provides ā¤ļøšŸ¤˜šŸ½šŸ™ŒšŸ½

  14. Hey bro. I've checked out a couple of your vids. Good stuff. But ya never mentioned nematodes. They are like little round worms that feast on fungs gnats larvae. You drop them in your rez and feed them. That's how you wipe out the cycle āœŒ

  15. If I may share my solution:

    Dealt with fungus gnats one time and had them forever and couldnā€™t figure out how to get rid of them. I recommend:
    First, check your soil before planting. Ensure itā€™s dry and free of gnats. You can spread it out on a tarp and it will dry faster but make sure bugs arenā€™t going to get into it.
    Second, have well draining cup and good air circulation. Overwatering, especially early on, can help the gnats thrive.

    Solution: mix powdered or crushed diatomaceous earth with a very coarse sand. I would add a thick layer with 10% DE and 90% sand to the top of your soil. The DE goes a long way. Be careful as it is very powdery, you will want to do this carefully, and maybe wear a face covering so you donā€™t inhale, but if itā€™s tiny amounts or just for one plant you may be ok. Donā€™t mix it into the soil. Cover your dirt with it. The DE will kill the gnats that try to enter and the sand acts as a very difficult obstacle course that may ultimately cut up the gnats and prevent them from flying. You can use small rocks as well but I wouldnā€™t recommend anything too large as the gnats could easily pass through them. On the other hand you donā€™t want to add too much sand to the top of your pot to the point where your soil will never dry out on top. After I did this the gnats just instantly disappeared and I had them for many many weeks before. Didnā€™t ever use a sticky trap. And I donā€™t recommend using H2O2 because imagine if you drank it. Plants donā€™t want it either.

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