Adult fungus gnats lay eggs in your growing medium. Repot The Plant To Deter Fungus Gnats. If you have any decaying organic material in your houseplant, adult gnats will find it and get attached … Drain Flies. Fungus gnats can be attracted to bright lights. Fungus gnats have a four-stage lifecycle. Once they hatch, the larvae will get attached to your plant roots and deprive them of nutrients. You may also see fungus gnats on cannabis. Gnats will eat the small micronutrients in soil. The larvae feed on fungal growth and decaying plant material but some species can also damage the roots of seedlings or tunnel into the base of soft cuttings. Larvae or maggots are legless, thread-like, white, shiny blackheads, up to … Size: Adult fungus gnats are tiny. Their size ranges from about 1/16 to of an inch in length (1.5 to 3mm), which is about the same size as a fruit fly. Fungus gnats live only about a month, but during that time each female may lay up to 300 eggs capable of hatching in a week. At rest, drain flies fold their wings over their bodies and they may grow up to 5 mm long. The fungus gnat is about the same size as a fruit fly, and generally found attacking plants indoors. The pale-colored maggots then reach full length at around two weeks, measuring approximately a quarter of an inch. Gnats prefer to lay their eggs in damp soil filled with decaying organic matter, which is why they love hanging out in greenhouses and around houseplants. Fungus gnats develop through four stages: egg, larvae (four larval stages or instars), pupa, and adult. Gnats are attracted to the smell of vinegar, especially apple cider … Fungus gnat larvae will die on direct contact with the H202. Remove Plants That Attract Gnats. You might have to look close because the larvae are super small. And they lay 200 eggs at a time! After the eggs open and the small larvae will start feeding on leaves on the soil and plant roots. After the fizzing stops, the H202 will break down into harmless oxygen and water molecules, supplying water to the plant. All you have to do is … The larvae then feed on plant roots, including those of young seedlings. In addition to fungi, maggots also eat leaf mold, mulch and plant roots. If you’re overwatering your plants, these bugs will find their way there and start laying eggs. What Damage Do They Cause? Fungus gnats are so named because their larvae, or maggots, feed on fungi from decomposing plant matter. These gnats have vein patterns in the wings. Fungus gnats are attracted to the moistness of potting soil, with the adults laying as many as 200 eggs near the surface in organic matter. These 200 eggs then hatch and turn into larvae…which feed on the fungi produced from the damp soil (hence the name fungus gnats). In two weeks, the adult fungus gnat emerges and repeats the cycle. Appearance: Adult fungus gnats are a grayish-black color and have gray or see-through wings. Of course, this is the preferred soil for many carnivores (without all the fungus and cyanobacteria). The pupae will emerge 4 days later as adults and the cycle starts again. They can be found in small groups (10+) or singly on surface soil or host plants. They start as eggs, then develop into larva, then pupa, and then adult. The tiny adult insects lay their eggs in peat moss, humus-rich organic soil and potting media. Apple cider vinegar trap for gnats. Fungus gnats (Sciaridae spp.) Microscopic bugs and bacteria are nearly present in virtually all bags of potting soil. Fungus gnats can breed all year round in greenhouses and houses. The females of the fungus gnat, that dance slightly during the flight, lay up to 200 eggs into the damp soil and die after approximately 3-7 days. 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