Yellow Sticky Traps Fungus Gnats: 50x Sticky Fly Trap for Indoor Plant – Yellow Sticky Fly Traps – Fungus Gnat Killer – Fruit Fly Trap by OwnGrown

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It depends on 2 things, how bad the infestation is/was and what stage in the lifecycle the majority of the fungus gnat population is/was. This solution relies on controlling the adults and the larvae, if there were very large numbers of either one then a second go might be needed. Another reason would be lots of fungus gnat eggs, there isn’t a control for the eggs so you may need to treat again 2 weeks later to control these hatched eggs.

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For the liquid version to work in potted plants, the soil must be allowed to dry out enough so that the soil absorbs the imidacloprid solution without any water runoff. For the next 10 days, any watering should be minimal to prevent leaching or diluting the imidacloprid solution from the soil. This ensures that the soil maintains the right ratio or concentration of imidacloprid during the 10 day period the plant needs to fully uptake the insecticide. For the older, hardier, more established plants we have never really seen any damage caused by the gnats. But plants such as herbs, impatiens, hoyas, and vegetable seedlings seem to really suffer once the fungus gnat larvae take hold in the soil. Seedlings fail to thrive. Other plants drop leaves or succumb to fungal infections. Apparently the larvae are capable of carrying pathogens that can cause real damage to vulnerable plants. Please consider having ads that are related to gardens. You will get more people responding to them because 99% of us want to garden and need gardening products. The people that want to wear politically provocative tshirts are a much lower percentile here. They can go on the blogs that are political and find those ads there. You would make more money from gardening ads.This is the type of place where people from all stripes TALK with each other and we need more of that in this country. . The reasons to switch are good. Dreistadt, S. H. rev. 1986. Fungus Gnats and March Flies. Oakland: Univ. Calif. Div. Agric. Nat. Res. Publ. 7051.The theory is to water your plants from the bottom so that the soil’s surface is drier. This may help somewhat along with other measures, especially for larger planters (1 gallon size) where the soil depth is greater than 10 inches if you can control how much water the plants receive so that the surface soil stays fairly dry.

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We tried this on two plants, and presumably because we used composted soil our larvae had plenty of other organic matter to feed on and weren’t interested in the potato slices. Using potato slices wasn’t an option in potted plants were the plant growth completely covered all the soil’s surface (peppermint plants, dragonwing begonias, etc). Bottom Watering 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. Fungus gnats develop through four stages—egg, larva (with four larval stages or instars), pupa, and adult. The tiny eggs and oblong pupae occur in damp organic media where females lay eggs and larvae feed. At 75ºF, eggs hatch in about 3 days, the larvae take approximately 10 days to develop into pupae, and about 4 days later the adults emerge. A generation of fungus gnats (from female to female) can be produced in about 17 days depending upon temperature. The warmer it is, the faster they will develop and the more generations will be produced in a year. By allowing the top portion of your potting mix to dry out, you’re making it less hospitable for fungus gnat eggs and larvae, and this will result in less gnats that will reach adulthood and pester you and your plants! CAPTURE ADULT FUNGUS GNATS WITH TRAPS Lastly, fungus gnat larvae mostly hang out in the top 1-2 inches of your potting mix and they like moist conditions so if your potting mix never dries out, you are helping to proliferate the problem!There are some home remedies which I haven’t tried so I can’t speak to their effectiveness, but here are two very effective methods to kill fungus gnat larvae in your potting mix. One is a biological control, and the other is a systemic pesticide. BIOLOGICAL CONTROL The last step that you’ll need to take is to treat the potting mix to kill the larvae so that they don’t turn into flying, adult fungus gnats. Sunlight also breaks it down faster after it is activated. Once you’ve made a batch of the solution, keep it out of sunlight. A study reported that sunlight can reduce the effectiveness up to 60% within 24 hours. Mosquito Donuts Stapleton, J.J.; C.A. Wilen, and R.H. Molinar. Pest Notes: Soil Solarization. Oakland: Univ. Calif. Agric. Nat. Res. Publ. 7441. Lastly, cover the soil with a layer of coarse sand of fine gravel which will not only help to keep the soil dry but make it less palatable for the gnats to lay eggs. Be patient. It may take 3-4 weeks of reduced watering combined with amended surface soil to get a handle on fungus gnats. How to Control Adult Fungus Gnats

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This neem oil spray is also extremely effective against mosquitoes and will kill spiders, too. Nematodes for Fungus Gnats Adult fungus gnats do not eat; their only purpose is reproduction. Over the course of her short lifespan, a female fungus gnat can lay 100 to 200+ eggs. A female gnat will deposit up to 40 eggs at a time on the surface of moist soil, near decaying organic matter, or hidden closer to the stem of a plant. In the open garden fungus gnats are not a problem and part of a well balanced biodiverse garden ecosystem

Pesticide control The RHS believes that avoiding pests, diseases and weeds by good practice in cultivation methods, cultivar selection, garden hygiene and encouraging or introducing natural enemies, should be the first line of control. If chemical controls are used, they should be used only in a minimal and highly targeted manner. 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 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. Allow the surface of peat-based composts to dry out a little before watering the plant again. Remove dying leaves and dead flowers regularly, so that they do not begin to decay and so attract fungus gnats. Adults are less likely to lay eggs on dry surfaces with no decaying plant tissue for the newly hatched maggots to feed on. Covering the compost with grit or pebbles can help. Neem oil is an excellent gnat repellant with a bonus of also killing aphids. When gnats and fruit flies ingest a substance that contains neem oil, it works to disrupt their ability to lay eggs, as well as the development of gnat larvae.