FUNGUS GNATS and How To Identify, Prevent and Destroy them – Cannabis Growing

Another pest control guide, today on Lex’s World, this time about Fungus gnats. Spelling for the last 3 chemicals I mention: Vectobac, Gnatrol, Bactimos. There’s …


  1. I have alot of tiny lil flying fukkkkers hanging in the Lil slots of my led grow light. Where the recess of each individual led light is. They look smaller than fungus gnats. Any ideas?

  2. Can theses guys make the buds on plant put out a unpleasant smell kind of a damp smell can’t put my finger on it but I defo got them gnats and I’m halfway threw flowering and can’t get my hands on hydrogen peroxide or neem oil anybody no what I can do or know what can make my buds smell bad they used to smell great lemon haze great

  3. If you're having trouble telling the difference between Fungus Gnats and Root Aphids look at the difference in wing length and their flight behavior. Root Aphids have wings that are atleast 2x longer than their bodies and they normal dont actually fly around but glide. So if you see some buzzing around erratically it's most likely just a Fungus Gnat.

  4. I recently had a gnat problem on some plants, if you catch it early enough before they start to fly and use traps to catch any that are flying. What worked for me was digging out the first inch or two of dirt and whipping down the inside and outside of the pot with a wet paper towel and then with a dry one. I then replaced the dirt with fresh potting soil and finally I sprayed down the soil with a mixture of 16oz water, pinch of cayenne pepper, and 3 drops of dish soap. This method worked on plants in both veg and bud stage. There were probably thousands of them crawling around, the dirt and pot looked like it had a lice infestation to put it into perspective. 24 hours after using this technique there was not one left.

  5. Frogot about the cinnamon I just starting having a problem with over watering..put a top layer on those bad girls and man had babys and the adults wigging didnt take no time at all..

  6. Lex I've be watching ur videos the last couple weeks are very educated about horticulture thank u for sharing ur knowledge. I'm a veteran outdoor grower, and I recently started doing indoor. And you tips and advice have played a huge roll in my success of doing it rite the first time! Thank you

  7. In my experience FFOF comes with gnats in the soil to begin with. I suggest that you bake your soil before you put it into the pots. This kills any gnats or pests in the soil but does not kill the nutrient content of the medium. I know i had gnats because I used it earlier this year and as soon as I watered my plant I get a influx of gnats I went with DE but you can also put a layer of sand on top of the soil 1 inch thick this will let you water the plant but the gnats have no food source to get to. Since they do live and breed in the top layer of soil. H202 also works to kill the larva and as a bonus it also aerates the soil for you. Yes you do need a few applications but H202 breaks down to plain water in the soil so you will not hurt the plant. The Ratio that is Recommended is 1/3 cup of H202 2/3 Water then water the whole pot. is it 1:2 or 1:3 I dont write out ratio platforms very often

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