Fungus Gnat
Sciaridae and Mycetophilidae
FliesAdults 1/8 to 1/4 inch long, dark delicate flies with long legs and antennae. Slender larvae have shiny black head and white thread-like body. Attracted to light and run rapidly over surfaces. Larvae feed on fungi, decaying organic matter, and plant root hairs in overwatered potted plants. Common in interiorscapes and greenhouses.
Control Methods
Recommended methods for controlling this pest
| Method | Type | Effectiveness | Requirements |
|---|---|---|---|
| Insect Light Trap Service | Non-Chemical | None | |
| UV Light Trap Installation and Maintenance | Non-Chemical | None |
Common Harborage Locations
Where to find this pest during inspections
| Location | Why Found There | Priority |
|---|---|---|
| Potted Plants & Houseplants | Overwatered soil creates ideal breeding conditions for fungus gnats. Organic matter in potting soil supports fungal growth that larvae feed on. Standing water in saucers provides moisture. | Medium |
Important Disclaimer: The information provided in this knowledge base is for educational and reference purposes only. Pest management professionals should always consult current product labels, Safety Data Sheets (SDS), manufacturer instructions, and applicable local, state, and federal regulations as the definitive source of truth. Product formulations, application methods, safety requirements, and regulations may change over time. This information may be out of date and should not replace professional judgment, proper training, or required licensing and certifications.