This is often impossible to see with the naked eye – which in turn will invite fungus gnats … Top dressing potted plants with a 1-2 inches of coarse sand or small pebbles actually seems like a great way to deter adult fungus gnats from laying eggs. Nothing makes fungus gnats happier than decomposed organic matter, and plant debris is no different. It takes a hatched egg approximately 18 days until it pupates and emerges as an adult. Potted plants can host fungus gnats at any stage – egg, larvae, pupae, and adults. But when treating an existing potted plant it’s soil will be moist, rendering the DE ineffective. What Do Gnats Eat? So we tried letting the soil soak overnight (10 hours). This study concluded that Bounce dryer sheets were effective in repelling up to 69% of adult fungus gnats. Using this ratio, a 3% strength which is already 97% water would be severely diluted and less effective, and a 35% strength would likely be too strong and could damage the plant’s roots. These pests have a Y-shaped pattern on their transparent wings which can be easily seen when they are at rest. There has actually been a study conducted to evaluate whether dryer sheets are effective in repelling fungus gnats. This is why it becomes important to manage and control them. To small crawling insects, it feels and acts like giant shards of glass. Repot The Plant To Deter Fungus Gnats. If fungus gnats start to emerge after you’ve brought your houseplants inside, you will need to use one method to kill the larvae and one method to catch flying adult fungus gnats. Fungus gnats are attracted to your valuable plants in the first place by wet soil and decaying organic matter. Another thing to keep in mind is that the same action that might kill the smaller larvae is also killing beneficial bacteria in your soil. For fungus gnats: Fungus gnats live and breed in the soil of your potted indoor plants. If you suspect mold or fungus, replace the pot liner, the soil, or both. We didn’t observe any difference in adult gnat activity from the soil of plants with cinnamon sprinkled on top of the soil to gnat activity on the soil plants without cinnamon on the surface. It is a perennial plant that is also … This method can either temporarily protect an uninfested plant from infestation (while affected plants are being treated) or isolate a plant during treatment for an infestation. The Stratiolaelaps scimitus seeks out fungus gnat larvae and other … At rest, drain flies fold their wings over their bodies and they may grow up to 5 mm long. If you use granules, you would mix them into the top 3 inches of soil and water as you normally would. These products are quite expensive, but you would need to buy them if you don’t want any damage further. Make small holes on the top of the jar so that the gnats can get inside easily. The common flies that are usually referred to as gnats are phorid flies, sand flies, and the ever annoying fruit flies. Neem oil is also an effective soil drench to combat fungus gnat larvae. The pupae are generally whitish which turns darker as soon as they emerge into adults. However, most of our plants are in smaller 6 to 8 inch pots and we use capillary mats and watering spikes which consistently keeps the soil evenly moist. But typically, you should expect it to remain effective for several days to two weeks. The granules are actually bits of corn cob, which will eventually decay and get moldy. Although Fungus gnats are often confused with mosquitoes and shore flies, it’s quite easy to identify them. As for adult fungus gnats who are flying around, their bodies would have to come into direct contact with dry DE in order to cause any real damage. Appearance: Adult fungus gnats are a grayish-black color and have gray or see-through wings. The cinnamon didn’t really seem to deter the adults from laying eggs. There are suggestions that submerging the pot of a potted plant in a bucket of water for a few hours will drown the fungus gnat larvae. … Drying out the top half of a plant’s soil will most likely kill quite a few larvae, but it could also likely kill your plant because you would have to do this several times to completely get rid of the larvae that burrowed a little deeper into the soil. You might kill a few larvae, but you will definitely kill your plant. Granted, the plant would likely compensate but it would be time consuming (given how many plant we have), messy, and likely expensive to buy enough pebbles for all our plants. Apparently the larvae are capable of carrying pathogens that can cause real damage to vulnerable plants. A couple of days later, the adult flies emerge and start buzzing around. 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