![]() There are several factors that may account for this seasonal peak. Nuisance problems with fungus gnat adults tend to be most noticeable during late fall and winter. Fungus gnat adults do not bite but may drink water residing on plant leaves and/or on the surface of growing media. At typical room temperatures (65 F to 75 F) the life cycle (egg to adult) may be completed in three to four weeks (Figure 1) with continuous reproduction occurring yearround on indoor plants. ![]() Moist-growing media containing high amounts of peat moss are particularly attractive to adult females. However, adult flies may disperse short distances and often accumulate around window frames.ĭuring their seven to 10-day life span, females may lay up to 200 eggs into the cracks and crevices of growing media. In homes, they usually are seen in the near vicinity of an infested houseplant. Fungus gnat adults are weak fliers, typically flying in short, erratic patterns. They then pupate in or on the growing medium.Īdults emerge about one week later. Larvae develop rapidly and are fully grown in two to three weeks. However, the larvae will feed on plant roots and leaves resting on the growing medium surface. They primarily feed on fungi, algae and decaying plant matter. Life History and Habitsįungus gnat larvae usually are located in the top 2 to 3 inches of the growing medium, depending on moisture level. The larvae are wormlike and translucent, with a black head capsule, and live in the gorwing medium of houseplants. There is a distinct “Y-shaped” pattern on the forewings. Fungus gnat larvae develop in the growing medium of houseplants and are considered minor pests of houseplants.Īdults are 1/8 inch long, delicate, black flies with long legs and antennae. They are considered a nuisance when present in noticeable numbers, but the adults are harmless insects that do not bite. Some insecticides and biological control agents can be used to control fungus gnat larvae in growing media.įungus gnats ( Bradysia species) – also known as dark-winged fungus gnats, are small, mosquito-like insects often found in homes and offices, usually in the vicinity of houseplants.Fungus gnats can be controlled by allowing the growing medium to dry between watering.Larvae of fungus gnats feed on algae, fungi and plant roots in growing medium.Fungus gnats are small, delicate bodied flies that commonly develop in the growing medium of houseplants.
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