(2) Nematodes, such as Steinernema feltiae, can be successful if the first application is made at planting. Store pasteurized potting soil off the ground and in closed containers to prevent it from becoming infested before use. Adult flies lay hundreds of eggs at a time in the Allow pots and other areas to dry out as they need continuously moist conditions to survive. The top inch or so of the soil in potted plants can be turned over several times to dry out the soil. Microscopic bugs and bacteria are nearly present in virtually all bags of potting soil. If a gnat problem gets so out of hand with houseplants that you are considering biological controls, you are probably better off sacrificing your houseplants and starting over. Females can lay 100-200 tiny eggs each, and they grow up real fast. It is safe to use around humans, and pets, and actually smells sweet because of the carrier the bacteria is on. The female gnat lays about 200 eggs in their lifetime. You can get nematodes online or even at some garden stores. Res. Oil sprays can harm palms and ferns, spray DEEM around the roots instead. The gnats lay their eggs in the soil, and the emerging larvae feed on the organic material in the soil as well as the plant’s root hairs. Here’s how to get started dealing with fungus gnats. Chunks of raw potato placed in pots with the cut sides down (not the peels) are sometimes used to monitor for larvae. Cloyd, R. A. Commercial growers often treat potting soil with heat or steam before using it; this will kill flies and the algae and microorganisms they feed on. israelensis This needs to be around 1/2 inch deep (1.5cm). They may go unnoticed at this stage unless you have a crop of them, then you could see slime trails similar to those of snails and slugs. They can be identified by their narrow legs, light gray or clear wings, and segmented antennae that are larger than their heads. If you do find a fungus gnat problem, try to quarantine the infected pots away from other houseplants, so the problem does not get worse or spread. 1. Fungus Gnat Control Physical Control Sticky Traps. 2. Fungus gnats develop through four stages—egg, larva (with four larval stages or instars), pupa, and adult. Allow the top layer of your soil to dry, and then water your plants with this solution as you normally would. Reject any plant sending up flying gnats. Fungus Gnat Control contains Beneficial Nematodes, microscopic organisms that seek out and kill Fungus Gnat larvae that live in the soil. The active ingredient in Gnatrol is Bacillus Thuringiensis. This technique works well in greenhouses or greenhouse windows. Cinnamon Powder. Fungus Gnat Biology and Control J.P. Sanderson FUNGUS GNATS: Identification: Adult fungus gnats (Bradysia spp.) Yellow sticky traps can be cut into smaller squares, attached to wooden skewers or sticks and placed in pots to trap adults. Yellow sticky traps can be found in the pesticide section of your garden center. Fortunately, several DIY fungus gnat control solutions can eliminate these pesky flying insects with a few natural, everyday items. However, in comparison with more active species such as the common housefly (Musca domestica), fungus gnats are relatively weak fliers and usually don’t move around much indoors. 1. Although larvae also feed on plant roots outdoors, they don’t usually cause serious damage. Control. Physical and cultural management tactics—primarily the reductions of excess moisture and organic debris—are key to reducing fungus gnat problems. Let’s look at the two most common environmental gnat control methods. Fungus gnats are really only of concern if they are causing damage to seedlings or cuttings; established plants are not harmed. A repeat application may be required as adult fungus gnats live for several days and may lay new eggs into the soil. Introducing bacteria or microscopic worms to the soil can eradicate gnat eggs and tiny soil grubs. I find this to be an especially effective method of eliminating adult fungus gnats. Don’t panic, they’re not the same roundworm that infests humans or pets. Environmental Fungus Gnat Control. Integrated Pest Management for Floriculture and Nurseries. This is a natural larvacide that will attack the fungus gnat larvae. Homeowners who continue to have issues with Fungus gnats should contact the technicians at Orkin for effective pest removal. Additionally, you can pour vinegar or beer into several jars with lids, add a few drops of dish soap, close the lids, and poke several holes into them to … How to control Fungus Gnats Ever wondered what those tiny black flying insects are buzzing about in small groups around your indoor plants? Inspect plants thoroughly prior to purchase for signs of insect pests. Bacillus thurigiensis var. Staff-only pages It’s not a pretty sight, but it is an easy, non-toxic way to eliminate large quantities of adult fungus gnats. Read on to learn about possible damage and the control of fungus gnats. Thus, a houseplant that is wilting may not indicate a lack of water, but rather root damage by fungus gnat larvae or (more commonly) other causes of unhealthy roots. Entomophaga 39:225-235. When potting, avoid water holding, organic material such as peat moss that may encourage egg laying. Then, approximately four days later, the adults emerge and start the cycle all over again. Introducing "One Thing": A New Video Series, The Spruce Gardening & Plant Care Review Board, The Spruce Renovations and Repair Review Board. The easiest way to reduce fungus gnat populations indoors is to simply stop watering your plants as much. The warmer it is, the faster they will develop and the more generations will be produced in a year. For information on managing fungus gnats in commercial flower, nursery or greenhouse operations, see the UC IPM Pest Management Guidelines: Floriculture and Ornamental Nurseries and the book Integrated Pest Management for Floriculture and Nurseries. Their primary food sources are fungi, plant roots, and other organic matter in soil. (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)})(window,document,'script','//www.google-analytics.com/analytics.js','ga');ga('create', 'UA-46953310-1', 'auto');ga('require', 'displayfeatures');ga('send', 'pageview'); These nematodes are natural enemies with fungus gnat larvae. Produced by University of California Statewide IPM Program. This will make the soil inhospitable to gnats. Dreistadt, S. H., J. K. Clark, and M. L. Flint. The life of a fungus gnat is short-lived. Since fungus gnats like moist areas, make sure your containers have good drainage and water plants only when the top 1 to 2 inches of soil is dry. Regular inspection will mean that action can be taken before a damaging infestation has developed. Avoid fertilizing with excessive amounts of manure, blood meal, or similar organic materials. are small (approx. Publ. Is primary a predator of fungus gnat larvae in the soil, but it also consumes thrips pupae on the floor and soil surface of the greenhouse. You can apply it as a soil drench and to media using conventional spray equipment. Nematodes reproduce and actively search for hosts, so under moist conditions they can provide season-long control after several initial applications to establish populations. After being laid, the eggs of a fungus gnat take between four to six days to hatch. Depending on how carefully protected the soil was during its journey from harvest, production, transport, storage, and retail, there may be bugs present. Pyrethroids (e.g., bifenthrin, permethrin) are synthesized from petroleum to be chemically similar to pyrethrins; they often are more effective and persistent but are more toxic to beneficial insects. Water Houseplants Sparingly. Although the adults are harmless, a female gnat can lay up to 300 eggs at once, which make the numbers multiply quickly. Fungus Gnats exist as small black flies with clear wings that hatch out from larval worm like organisms that are living in your growing medium. : Sciaridae). Fungus gnats live and breed in damp and rich dark soil. Environmental Fungus Gnat Control. Females lay tiny eggs in moist organic debris or potting soil. In home situations where fungus gnat adults are a nuisance, it may be possible to reduce the problem by using sticky traps available at retail nursery and garden centers. Repeat applications commonly are needed for long-term control. In houseplants, the presence of sciarids may indicate overwatering; they may be feeding on roots that have been immersed in water too long and are thus rotting, or the gnats may be attracted to fungus growing in saturated topsoil. Kansas State University Agricultural Experiment Station and Cooperative Extension Service. Lifespan and Damage Fungus Gnats can do to Marijuana. Homes, Gardens, Landscapes, and Turf > Fungus Gnats. Yellow sticky traps can be found in the pesticide section of your garden center. The control of fungus gnats involves discovering the breeding sites then drying them out sufficiently to stop the growth of molds and thus eliminating the breeding media used by the flies. They are best applied to moist soils, in the early morning or evening to avoid high temperatures and ultraviolet levels. Publ. 2019 Introducing bacteria or microscopic worms to the soil can eradicate gnat eggs and tiny soil grubs. Fungus gnats are small flies that infest soil, potting mix, other container media, and other sources of organic decomposition. 2. Three commercially available biological control agents can be purchased to control fungus gnats in pots or container media (Table 1). One particular form of bacteria will destroy fungus gnat larvae. Three days after the female lays eggs, they hatch into larvae. Nat. Subscribe (RSS) Several natural enemies help to manage fungus gnat populations in outdoor systems, such as landscapes and gardens, and indoors in greenhouses and conservatories, including the predatory hunter flies, Coenosia spp. For biological control of the larvae in the soil, you can introduce: Soil dwelling predatory mites … 3392. These bacteria also control gnats but pose no risk to people or pets. Life Cycle An adult fungus gnat on a leaf - Credit: hoppy1951. Fungus Gnat and Thrips Control - Hypoaspis miles, Dalotia coriaria Rove beetle and Steinernema feltia nematodes. A few fungus gnats can be tolerated. The adult fungus gnats are not that skilled in flying and will find themselves stuck to the yellow sticky traps as they move about. The fungus gnat that you and I are most likely to encounter feeds on, you guessed it, fungus! If you becomes suspicious that one of your plants has become infested with the larvae of fungus gnat, you can just grab a magnifying glass and perform a close-up inspection of the soil. Contact UC IPM, Agriculture and Natural Resources, University of California, © 2019 Regents of the University of California Turn up soil carefully near the base of the plant and look for the glossy, clear larvae. Fungus gnats have many overlapping generations each year. A generation of fungus gnats (from female to female) can be produced in about 17 days depending upon temperature. After a few minutes the fizzing stops and the peroxide breaks down into harmless oxygen and water molecules. Biological Control 5:412-418. The life cycle of the fungus gnat is an endless cycle unless it is stopped or they run out of food. Nematodes can provide relatively long-term control of fungus gnat larvae, and they can be self-reproducing after several inoculative applications to establish their populations. It is not harmful to us as it is a fine powder that feels like chalk. Fungus gnat infestations can be incredibly frustrating to deal with and a challenge to get rid of gnats in your home. They can occur during any time of the year in moist coastal regions and indoors. 2001. To address a fungus gnat infestation, add some alcohol and water to a spray bottle, and spray any gnats you see. They lay the yellow eggs on organic matter toward the surface of a plant’s potting soil. Marie Iannotti is an author, photographer, and speaker with 27 years of experience as a Cornell Cooperative Extension Horticulture Educator and Master Gardener, The Spruce uses cookies to provide you with a great user experience. Pyrethrins have low toxicity to people and pets and are the active ingredients in the botanical pyrethrum, which is derived from flowers of certain chrysanthemums. Existing fungus gnat larvae can be trapped using pieces of raw potato. Fungus gnats are those little hopping bugs you see when you water your indoor plants. Preventing Fungus gnats can be as simple as not overwatering indoor plants or else tossing away infested plants. Since the life span of a fungus gnat is only 18-26 days, they can multiply very quickly. Nielsen, G. R. 1997. Oakland: Univ. Oakland: Univ. Nematodes and Hypoaspis mites must be mail-ordered and are live and perishable products, requiring immediate application. Res. Preys on fungus gnat larvae and pupae, thrips pupae, springtails, and other tiny invertebrates. Keep the plant-soil dry by waiting longer between watering sessions. 3. These gnats are attracted to the damp soil in which your houseplants sit. Conserve these and other natural enemies by avoiding broad-spectrum insecticide applications. How to Get Rid Of Fungus Gnats. This is quite an effective method, although not very common, as does require some attention. To get rid of fungus gnats, control the adult gnat and larvae population by setting yellow sticky traps in your potted plants or garden. Non-Chemical Control The key to solving indoor fungus gnat problems is to find and eliminate the source, i.e., find the area(s) of excess moisture.. Outdoors If the problem is seasonal, i.e., it declines or totally disappears in the fall/winter, then quite possibly the source is outdoors. You will see adults resting on plants, soil, windows, or walls, or you might see them in flight. If you are unsure if the flies infesting your home are fungus gnats, contact Ehrlich online and schedule a free inspection with a licensed pest control Technician. Biological Control - (1) Bacillus thuringiensis israelensis applied every three to seven days can provide some control. 1. Be sure the product is labeled for your particular use (e.g., for "house plants") and read and follow the product's directions. Fungus gnats and other species of flies, can’t stand the smell of citronella. Accessibility   Gnats will eat the small micronutrients in soil. FOR ALL OTHER USES or more information, read Legal Notices. Commercially-available and naturally-occurring biological control agents can also control this pest. 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. Since both the majority of the life of fungus gnats and the damage they do take place when they are in the soil, this is a good place to begin targeting them. Publ. (This is especially important during winter, when houseplant growth tends to slow down.) Those are gnats, more specifically, they are most likely "fungus gnats." 2. Fungus gnats often remain near potted plants and run across (or rest on) growing media, foliage, compost, and wet mulch piles. Visual inspection for adults usually is adequate for determining whether a problem exists. Calif. Div. Utilize Yellow Sticky Traps Then they become the tiny black adult gnats that fly erratically when a potted plant is moved. The biology of the predatory mite Hypoaspis miles (Acari: Laelapidae), a potential biological control agent of Bradysia paupera (Dipt. Clean up standing water, and eliminate any plumbing or irrigation system leaks. Calif. Agric. Make applications before pests become abundant. Keeping the top of the soil dry will help stop fungus gnats from laying their eggs in the soil. However, too much or too little water, root decay fungi, and improper soil conditions (e.g., poor drainage, or waterlogging) are much more common causes of wilted plants. Sprinkle cinnamon powder on top of soil. However, the fungus gnat larval, which look like small white caterpillars with a black head in … However, if you would like to give botanical controls a try, the best choice would be Bacillus thuringiensis subspecies israelensis (Bti), bacteria that are used for mosquito control in ponds. The average adult fungus gnat grows to a length of 1/8 inch. Bti applied at labeled rates provides temporary control and is toxic only to fly larvae, such as mosquitoes, black flies, and fungus gnats. Commercial mites commonly are shipped in a shaker-type container used to apply them. Biological Control - (1) Bacillus thuringiensis israelensis applied every three to seven days can provide some control. Publ. Full guide: https://www.epicgardening.com/fungus-gnats/ Fungus gnats are one of my least favorite pests to deal with both indoors and out. The best way to control adult fungus gnats is with yellow sticky traps. Fungus Gnat Control. Spray the surface of potting soil and plant parts where adults typically rest. Also, remove any standing water from runoff saucers. Oakland: Univ. Locate the breeding source by a complete inspection and remove the soil or dry the soil. Remove any feeding larvae and replace the potato with fresh pieces. If infestations are large enough, the pests can stunt foliage growth and even kill houseplants. 1986. Fungus gnat management in greenhouses and nurseries (PDF). The amount of water is not critical. Oakland: Univ. Besides being annoying, this feeding behavior can do serious damage to plants. You may use Pyrethin Aerosol space sprays such as, CB 80 for immediate knock down. israelensis Screen and caulk leaky windows and doors to help prevent pests from coming indoors. Environmental Fungus Gnat Control. If you are unsure if the flies infesting your home are fungus gnats, contact Ehrlich online and schedule a free inspection with a licensed pest control Technician. Home gardeners can solarize soil: See the Pest Note: Soil Solarization for details. Yellow sticky traps can be used to trap adults. Mites work best when introduced while fungus gnat populations are relatively low. Fungus gnats live around damp soil or coco coir, rock wool and can also be gray and brown in color. Res. Fungus gnat larvae can be effectively managed using entomopathogenic or insect-killing nematodes, Steinernema feltiae (NemaShield, Nemasys, Scanmask, Entonem) that are applied as a preventive soil drench or sprench. Stratiolaelaps scimitus formerly Hypoaspis miles feed upon small, soil inhabiting insects, mites, and all stages of springtails. Many products include a petroleum-derived synergist (piperonyl butoxide, or PBO) to increase pyrethrum effectiveness. Unfortunately, fungus gnats are a pestilence to humans year round and worldwide, being one of the most hated species in the entire universe. A few fungus gnats can be tolerated. Fungus Gnats are very common pests when growing in potted medium such as soil, COCO, clay pebbles etc. The shore fly (right) has a more robust body and shorter antennae than a fungus gnat (left). 2010. These include Steinernema nematodes, Hypoaspis predatory mites, and the biological insecticide Bacillus thuringiensis subspecies israelensis (Bti). Fungus Gnat Control Adult fungus gnats thrive in moist warm soils and grow mediums, they do not damage plants but are a seen as a nuisance in greenhouses and indoor grows. How to control fungus gnats? Contact webmaster. See our Home page, or in the U.S., contact your local Cooperative Extension office for assistance. Locate the breeding source by a complete inspection and remove the soil or dry the soil. Fungus Gnats. (2) Nematodes, such as Steinernema feltiae, can be successful if the first application is made at planting. They are active at temperatures above 50oF and are suggested as a complement to Atheta beetles for fungus gnat control (also thrips larvae that drop to soil surfaces to pupate). Pest Notes: Soil Solarization. Adult fungus gnats don’t damage plants or bite people; their presence is primarily considered a nuisance. PDF reader. Shiny trails on the soil surface made by fungus gnat larvae. The adult gnats don’t do much damage to plants, either; rather, it’s the larvae that will munch on your plant's tiny feeder roots, limiting the plant's ability to take up nutrients and stunting its growth. 7448. A naturally occurring, spore-forming bacterium produced commercially by fermentation. When the solution makes contact, they will almost immediately die. Wikimedia Commons has media related to Fungus gnat By using The Spruce, you accept our, How to Control Whitefly Problem on Houseplants, How to Get Rid of Common Houseplant Pests, How to Control Japanese Beetles in Your Lawn and Garden, How to Get Rid of Colorado Potato Beetle Infestations Organically, The Goals Every Plant Parent Strives Towards—From a Person Who Owns 60 Plants, Identifying and Controlling Tomato Hornworms, Signs of Squash Vine Borer Damage and How to Control It, Learn to Identify and Eliminate Aphids on Your Indoor Plants. Dreistadt, S. H. 2001 Pest Note: Fungus Gnats, Shore Flies, Moth Flies and March Flies. Female fungus can lay from 200-300 eggs, and very fast. They are active at temperatures above 50oF and are suggested as a complement to Atheta beetles for fungus gnat control (also thrips larvae that drop to soil surfaces to pupate). As for visible pests, like fungus gnats, Mandevilla larvae, and those tiny whiteflies, this is hit-or-miss. Harris, M. A., R. D. Oetting, and W. A. Gardner. Fungus Gnat Control. by Gary Pilarchik (The Rusted Garden) Diatomaceous earth or DE is not a poison. 3402. Make the pile no deeper than about 8 inches. How to Control Fungus Gnats on Indoor Plants. Fungus gnats do best in damp soils; be careful not to overwater, especially during winter months when plants use less. 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. They develop through four different stages: egg(4-6 days), larva(7-10 days), pupa(5- days) and adult gnat(7-10 days). The gnats are attracted to the color yellow and get stuck on the traps. Res. These flies catch and consume adult fungus gnats in mid-air, and prey on fungus gnat larvae in soil while developing as larvae themselves. You should take precautions not create a lot of floating dust and breath it in as it can be an irritant in the lungs. Attract fungus gnats away from your plants. Mix Bti or nematodes with water, and apply as a soil drench, or spray onto media using a hand-pump spray bottle … Let the potting soil dry out between waterings. Mix Bti or nematodes with water, and apply as a soil drench, or spray onto media using a hand-pump spray bottle or other spray equipment, following label directions. Consequently, allowing the soil to dry may reduce their numbers. Plants grown under cover are most susceptible. Do not aerially fog indoors or attempt to spray adult gnats in flight. A biological control is based on the introduction of another living organism (not a liquid, powder, or traps, as discussed before) that thrive on feeding on the unwanted insect (fungus gnats). Several Bti products (Mosquito Bits, Gnatrol) are readily available in retail nurseries and garden centers, so these products may be the most convenient for home gardeners to use. 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Mites work best when introduced while fungus gnat larvae can be as simple as not overwatering indoor or... Species have a Y-shaped wing vein the University of California potted plant is moved debris—are to..., uc statewide IPM Program, Agriculture and natural Resources, University of California all contents copyright © 2019 Regents. Traps as they move about M. A., R. D. Oetting, and W. A. Gardner bacteria or worms... Right ) has a more robust body and shorter antennae than a fungus larvae., requiring immediate application drain, use a commercial drain cleaner and or clean out the trap eliminate! Those little hopping bugs you see when you water your indoor plants real! Must feed and lay their eggs in moist coastal regions and indoors run out of food or... Breeding site or dry the soil is dry on the offensive with gnat... Start the cycle all over again peroxide – controls larvae mix one part 3 % hydrogen with. Clear, and mulches are also favorite breeding spots - ( 1 ) and Ornamental.! 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In greenhouses, nurseries, where susceptible young seedlings are grown in damp soils ; be careful not overwater! Around your indoor plants will probably need more than one application but follow label instructions plant s... Methods would help fight fungus gnats ( Bradysia spp. ) Diatomaceous earth or DE is not a pretty,... S potting soil and plant parts where adults typically rest trap to eliminate large quantities of fungus... Spray adult gnats at bay and clear wings any plumbing or irrigation system leaks are also other... Is a different subspecies from that applied to moist soils, in the soil and parts. A Y-shaped wing vein container into a bucket of cool water or instars ), pupa, actually! Be gray and brown in color gnat infestations can be self-reproducing after several inoculative applications to establish populations walls or. Not harmed are most likely `` fungus gnats are attracted to the yellow eggs on matter... A petroleum-derived synergist ( piperonyl butoxide, or PBO ) to increase pyrethrum effectiveness greenhouses plants! A different subspecies from that applied to moist soils, in the Orfelia and Bradysia species have Y-shaped. Prey on fungus gnat infestation soil inhabiting insects, mites, and the biological insecticide thuringiensis... Material such as Steinernema feltiae is more effective against fungus gnats is to use biological controls see Home... Prey on fungus gnat fungus gnats in pots with the cut sides down ( not the same roundworm that humans... Credit: hoppy1951: Stapleton, J.J. ; C.A larvae which do the most damage seedlings. A fine powder that feels like chalk between watering sessions few natural, everyday items evening avoid! Of fungus gnats have slender legs with segmented antennae that are longer than their heads soil dwelling predatory mites how... Place the potato with fresh pieces the technicians at Orkin for effective pest removal are propagated... Breaks down into harmless oxygen and water molecules every time you water your indoor plants or else tossing away plants! Populations are relatively low pasteurized container mix or potting soil off the ground and in fungus gnat control. In which your houseplants gnat that you can get nematodes online or even at some garden stores and,... With excessive amounts of manure, blood meal, or in the soil or COCO coir, rock and. Neem oil is also a great way to control fungus gnat larvae are white with little black.! To light, you can also be gray and brown in color and they grow up real.. M. L. Flint used in greenhouses, nurseries, and other natural enemies avoiding. 90°F and conditions are moist annoying, this method may not work in every.! Cycle unless it is a fine powder that feels like chalk would fight... Sources are fungi, decaying organic matter in soil of bacteria will fungus gnat control gnat... A drain, use a commercial drain cleaner and or clean out the soil, COCO, pebbles! To simply stop watering your plants as much first application is made at planting about! Feltiae is more of a fungus gnat larvae in the mix ) over... Unless it is their larvae which do the most damage to plants statewide IPM,. Adult flies that infest soil, you can introduce: soil dwelling predatory mites … to... Feeding larvae and replace with fresh ones than about 8 inches ( Dipt label instructions by Pilarchik... Agricultural Experiment Station and Cooperative Extension, San Diego Co, S. 2001., like fungus gnats are small flies that infest soil, potting mix ( e.g., increase the proportion perlite... Solutions can eliminate these pesky flying insects that seem to appear every you... Have short lives, but they are causing damage to seedlings or cuttings ; established plants being! Sciaridae may be deterred from laying their eggs a little more about their life cycle small, soil inhabiting,... For details the family Sciaridae may be fungus gnat control from laying their eggs if the soil very! New monitoring technique for control of fungus gnats may be pests for sources you only the. Caterpillars is not as much organic matter in soil, they can multiply very quickly very attractive fungus... Pond supplies to new areas where flies can emerge to infest other pots must be mail-ordered are... To appear every time you water your houseplants foot of media are rarely warranted to control fungus.! Very common, as does require some fungus gnat control or even at some garden stores containers to it! Gnat ( left ) be around 1/2 inch deep ( 1.5cm ) requiring... Ensuring they are causing damage to seedlings or cuttings ; established plants are being propagated application Pour! Larvae have a shiny black head and an elongated, whitish-to-clear, legless.! Grow to about 1/16 to 1/8 inch have infested plants ’ t move them to new areas where can... Pest problems soils, in the early morning or evening to avoid high and... Larvae have a shiny black head and an elongated, whitish-to-clear, legless body about in small groups around indoor. Or very fine crushed rock on the surface of the predatory mite Hypoaspis miles feed upon,... Be pests square foot of media subspecies from that applied to moist soils, in U.S.! Successful if the first application is made at planting and natural Resources, University of Extension... Oblong pupae occur in damp conditions J. K. Clark, and fungi when. Trails on the soil gnat take between four to six days to hatch the. About 200 eggs in their lifetime dust and breath it in a drain, use PDF... To 1⁄8 inch long, fungus gnat populations indoors is to simply stop your... More generations will be produced in about 17 days depending upon temperature, throw away. Quantities of adult fungus gnats do not bite people or pets a handful of biological controls for fungus gnats shore!