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Fungus Gnats FUNGUS GNATS Integrated Pest Management in the Home, Garden and Landscape Fungus gnats are small flies that in- fest soil, potting mix, other container media, and other sources of organic decomposition. Their larvae primarily feed on fungi and organic matter in soil, but also chew roots and can be a problem in greenhouses, nurseries, potted plants and interior plantscapes. Adult fungus gnats may emerge from houseplants indoors and become a nuisance. Figure 1. Fungus gnat adult caught in a yellow sticky trap. IDENTIFICATION Fungus gnats (Orfelia and Bradysia spe- cies), also called darkwinged fungus gnats (Sciaridae), are dark, delicate- looking flies similar in appearance to mosquitoes. Adult fungus gnats (Figure 1) have slender legs with segmented Figure 3. A Y-shaped wing vein antennae that are longer than their distinguishes common fungus gnats head. Their long antennae distinguish from most other small flies in the home and greenhouse. them from the more robust shore flies, which are also found in greenhouses, associated with algae and decomposing Figure 2. Fungus gnat adult (left) organic matter, but have short bristle- and shore fly (right). Note the more like antennae (Figure 2). Although a few robust body and shorter antennae on species are up to 1⁄2 inch long, fungus the shore fly. gnat adults commonly are about 1⁄16 to 1⁄8 inch long. Wings are light gray to clear, and the common Bradysia species 4) have a shiny black head and an elon- have a Y-shaped wing vein (Figure 3). gated, whitish-to-clear, legless body. They eat organic mulch, leaf mold, Because adult fungus gnats are at- grass clippings, compost, root hairs, tracted to light, you first might notice and fungi. If conditions are especially Figure 4. Fungus gnat larvae. these pests flying near windows in- moist and fungus gnats are abundant, doors. However, in comparison with larvae can leave slime trails on the sur- more active species such as the com- face of media that look like trails from mon housefly Musca( domestica), fun- small snails or slugs (Figure 5). gus gnats are relatively weak fliers and usually don’t move around much in- DAMAGE doors. Fungus gnats often remain near potted plants and run across (or rest Adult fungus gnats don’t damage on) growing media, foliage, compost, plants or bite people; their presence is and wet mulch piles. primarily considered a nuisance. Lar- vae, however, when present in large Females lay tiny eggs in moist organic numbers, can damage roots and stunt Figure 5. Shiny trails on the soil surface debris or potting soil. Larvae (Figure plant growth, particularly in seedlings made by fungus gnat larvae. PEST NOTES Publication 7448 Statewide Integrated Pest Management Program August 2013 August 2013 Fungus Gnats and young plants. Significant root dam- Physical and cultural management If you have infested plants, don’t move age and even plant death have been tactics—primarily the reductions of ex- them to new areas where flies can observed in interior plantscapes and cess moisture and organic debris—are emerge to infest other pots. In some in houseplants when high populations key to reducing fungus gnat problems. cases you may wish to toss out severely were associated with moist, organical- Commercially-available and naturally- infested plants. ly-rich soil. Thus, a houseplant that is occurring biological control agents can wilting may not indicate a lack of wa- also control this pest. Insecticides are Purchase and use only pasteurized ter, but rather root damage by fungus considered an important control option container mix or potting mix. Com- gnat larvae or (more commonly) other in some commercial plant production mercial growers often treat potting soil causes of unhealthy roots. However, but generally aren’t recommended with heat or steam before using it; this too much or too little water, root decay for fungus gnat management in and will kill flies and the algae and micro- fungi, and improper soil conditions around the home. organisms they feed on. Home garden- (e.g., poor drainage, or waterlogging) ers can solarize soil: are much more common causes of Monitoring 1. Moisten it. wilted plants. 2. Place it in a bag of transparent Visual inspection for adults usually plastic or black plastic. Serious fungus gnat damage is more is adequate for determining whether 3. Make the pile no deeper than common in greenhouses, nurseries, a problem exists. You will see adults about 8 inches. and sod farms. Although larvae also resting on plants, soil, windows, or 4. Place the bagged soil on a slightly feed on plant roots outdoors, they don’t walls, or you might see them in flight. elevated surface, such as a pallet usually cause serious damage. Besides looking for adults, check plant in a sunny location, for about 4 to pots for excessively moist conditions 6 weeks. LIFE CYCLE and organic debris where larvae feed. Fungus gnats develop through four Yellow sticky traps can be used to trap See the Pest Note: Soil Solarization listed stages—egg, larva (with four larval adults. Chunks of raw potato placed in in the references for details. Store pas- stages or instars), pupa, and adult. The pots with the cut sides down (not the teurized potting soil off the ground tiny eggs and oblong pupae occur in peels) are sometimes used to monitor and in closed containers to prevent it damp organic media where females for larvae. from becoming infested before use. lay eggs and larvae feed. At 75ºF, eggs hatch in about 3 days, the larvae take Water and Soil Management Trapping approximately 10 days to develop Because fungus gnats thrive in moist In home situations where fungus gnat into pupae, and about 4 days later the conditions, especially where there is an adults are a nuisance, it may be pos- adults emerge. A generation of fungus abundance of decaying vegetation and sible to reduce the problem by using gnats (from female to female) can be fungi, avoid overwatering and provide sticky traps available at retail nursery produced in about 17 days depending good drainage. Allow the surface of and garden centers. Yellow sticky traps upon temperature. The warmer it is, container soil to dry between water- can be cut into smaller squares, at- the faster they will develop and the ings. Clean up standing water, and tached to wooden skewers or sticks more generations will be produced eliminate any plumbing or irrigation and placed in pots to trap adults. Also, in a year. raw potato chunks placed in the soil system leaks. Moist and decomposing are very attractive to fungus gnat grass clippings, compost, organic fer- Fungus gnats have many overlapping larvae. These may be used not only to tilizers, and mulches are also favorite generations each year. Outdoors, they check pots for larvae but also to trap breeding spots. Avoid using incom- are most common during winter and them away from plant roots. After a pletely-composted organic matter in spring in interior areas of California, few days in a pot, remove infested potting media unless it is pasteurized when water is more available and cool- chunks, dispose of them, and replace er temperatures prevail. They can occur first, because it will often be infested with fresh ones. during any time of the year in moist with fungus gnats. Improve the drain- coastal regions and indoors. age of the potting mix (e.g., increase Biological Control the proportion of perlite or sand in the Three commercially available biological mix). Minimize organic debris around MANAGEMENT control agents can be purchased to con- buildings and crops. Avoid fertilizing Most of the fungus gnat’s life is spent trol fungus gnats in pots or container with excessive amounts of manure, as a larva and pupa in organic matter media (Table 1). These include Steiner- blood meal, or similar organic materi- or soil, so the most effective control nema nematodes, Hypoaspis predatory als. Screen and caulk leaky windows methods target these immature stages mites, and the biological insecticide and doors to help prevent pests from rather than attempting to directly Bacillus thuringiensis subspecies israelen- control the mobile, short-lived adults. coming indoors. sis (Bti). Several Bti products (Mosquito ◆ 2 of 4 ◆ August 2013 Fungus Gnats Bits, Gnatrol) are readily available in avoiding broad-spectrum insecticide more effective and persistent but are retail nurseries and garden centers, so applications. more toxic to beneficial insects. When these products may be the most con- using these products on houseplants venient for home gardeners to use. Bti Chemical Control or interiorscape containers, if possible does not reproduce or persist indoors, Insecticides are rarely warranted to move plants outdoors for treatment as a precaution, and wait about a day after so infestations in potting media might control these flies in and around homes. applying the chemical before bringing require repeated applications at about However, if you do apply an insecticide them back inside. five-day intervals to provide control. for fungus gnats, consider using Bti or Nematodes and Hypoaspis mites must Steinernema feltiae nematodes to control For information on managing fungus be mail-ordered and are live and per- the larvae; see the section Biological gnats in commercial flower, nursery ishable products, requiring immediate Control for more information. application. Nematodes can provide or greenhouse operations, see the UC IPM Pest Management Guidelines: relatively long-term control of fungus If Bti or nematodes aren’t available and gnat larvae, and they can be self-repro- Floriculture and Ornamental Nurseries high populations are intolerable, pyre- and the book Integrated Pest Manage- ducing after several inoculative appli- thrins or a pyrethroid insecticide may cations to establish their populations. ment for Floriculture and Nurseries listed provide temporary, fast-acting control.
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