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Tip: people often confuse fungus gnats with fruit flies. However, the two are easy to distinguish as fruit flies need fruits or vegetables as a food source and therefore do not stay in or around houseplants. How to get rid of fungus gnats

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It’s been suggested that by drenching the soil with a hydrogen peroxide mix will kill fungus gnat larvae. It’s important to keep in mind that if your soil is fairly compact, hydrogen peroxide will only penetrate the top few inches of the soil. As soon as the hydrogen peroxide interacts with organic material (when you see fizzing) it begins to break down into water and oxygen. Depending on how much organic material is in your soil, even if your soil is loose the hydrogen peroxide will likely break down before getting deeper into the soil. Place the bagged soil on a slightly elevated surface, such as a pallet in a sunny location, for about 4 to 6 weeks.This really should fall in the “killing two birds with one stone” category. 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. When it comes to watering your plants, it is crucial that you make sure not to overwater your potted plants and allow the soil to dry a little between waterings. This is also one of the best ways to treat soil mites and mealybugs, too. Too much water can cause a lot of problems. Mosquito Bits are made up of granules containing a biological larvacide Bacillus thuringiensis israelensis (BTI for short). It contains a natural bacteria that is specifically targeted to kill certain larvae, and is considered to have a low toxicity for non-target species of insects. Within 4 to 6 days, the eggs will hatch and begin feeding. For 14 days, the larvae will feed on any organic matter on or in the soil. They primarily focus on eating the soil’s organic matter, but in the case of severe infestation, they will also begin feed on the finer root hairs of a plant, the plant’s roots, and possibly the crown, stem and any leaves of the plant that are located near the surface of the soil. Larvae are usually located in the top 2-3 inches of soil, but we have observed larvae as deep as 6 inches in potted soil as well as around a pot’s drainage holes.

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Hydrogen peroxide is an excellent and inexpensive method for killing and adult fungus gnat infestations in the house and garden. Not only is hydrogen peroxide for fungus gnats a natural remedy, but it’s safe to use around your family, pets, and garden plants. Plan on using the solution within 24 hours for maximum effectiveness. How Long Is BTI effective In The Soil? Fungus gnats may be confused with fruit flies. The difference between the two is evident upon close inspection. Fruit flies have bodies that are perfect miniatures of the house fly, while fungus gnats have long legs dangling from an elongated body, much like a mosquito. Another option is biological control using Bacillus thuringiensis subsp. israelensis (Bti). Treatment using Bti doesn’t affect eggs, pupae or adult gnats. Instead Bti filters through the soil to reach larvae. Bti should be applied several times every 5-7 days to control newly hatched larvae. Cloyd, R. A. 2010. Fungus gnat management in greenhouses and nurseries (PDF). Kansas State University Agricultural Experiment Station and Cooperative Extension Service. Publication MF-2937:With some other pests, I often use Bonide Systemic Houseplant Insecticide in combination with sprays to add a little more “oomph” and it works very well. FUNGUS GNAT TREATMENT SUMMARY After 14 days the larvae will stop eating and begin their pupal stage to emerge as adults in 4 to 6 days. A female can mate shortly after emerging from her pupal case, and the cycle begins again. Fungus Gnat Control Methods Apple Cider Vinegar Because the BTI is activated by alkaline environments, it breaks down faster when used in acidic soils. But typically, you should expect it to remain effective for several days to two weeks. One study reported that it remained effective underneath the soil’s surface for four to twelve months. If fungus gnats emerge 2 weeks after treatment, you’ll need to reapply the solution. Before adding the nematodes to the soil, make sure you soak the area because, like the fungus gnat, they prefer dark, moist environments. Once you’ve added the nematodes to the soil of your houseplants, they will get to work feeding on any gnat larvae that they find. Soil Drench to Kill Fungus Gnats Essential oils have long been used to repeal all kinds of insects, including fungus gnats effectively. At the first sign of a gnat infestation, you can add one of the essential oils that has proven to be effective against fungus gnats to your diffuser.

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Keep in mind that if you are treating the soil of a plant already in distress or already experiencing root issues, exposing it to even more moisture or depriving the soil (and plant roots) of oxygen too long might also kill your plant. Bounce Fabric Dryer Sheets Adults are about 2.5 mm in length. Larvae are tiny when hatched and can grow to 5.5 mm in length Lifespan

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Symptoms and Effects: Fungus gnats are usually noticed indoors when adults fly around light sources (e.g., windows, lamps), or when they fly around or walk across and rest on the soil of potted plants. Adult fungus gnats do not feed on or damage plants but are a cosmetic nuisance. Fungus gnat larvae typically feed on decaying organic matter and fungi in the soil. However, if larval numbers are high, they may damage roots by feeding on root hairs or tunneling into the roots themselves. This sort of damage is rare in home settings. I love my houseplants (duh, hello, welcome) but I don’t love every aspect of having plants inside the house.

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Finally, there are some home remedies that may help control fungus gnat populations. You may have heard of or tried vinegar or wine traps but unfortunately, they only work for fruit flies. Insecticides are rarely warranted to control these flies in and around homes. However, if you do apply an insecticide for fungus gnats, consider using Bti or Steinernema feltiae nematodes to control the larvae; see the section Biological Control for more information. Other likely targets are cucumbers and cultivated mushrooms. When conditions are favourable – in houses or warm greenhouses – breeding can take place all year round.

There has actually been a study conducted to evaluate whether dryer sheets are effective in repelling fungus gnats. The sheets contain ingredients that are know to repel insects; linalool, benzyl acetate, and beta-citronellol. This study concluded that Bounce dryer sheets were effective in repelling up to 69% of adult fungus gnats. Bees, ladybirds and other beneficial insects rarely stray into our house or greenhouses, so the risk of accidentally catching them is relatively low. That said, you should think twice before using traps outdoors, as there is no way of ensuring that no beneficial insects or small birds will fly into them.