The breeding and reproduction patterns are reasons to eliminate gnats as soon as possible. Fungus Gnat Life Cycle. However, adult flies may disperse short distances and … In about 4-6 days these eggs hatch into larvae and begin snacking on the roots of your plants in the moisture rich soil. Adults emerge about one week later. With a life span of about four weeks from egg to adult, each female can lay 200 to 300 eggs and cause havoc all year. The larvae feed on root hairs, the stems of unrooted cuttings, and organic material. Life Cycle of Fungus Gnats. What's nice is the adult fungus gnat only lives around one week, but in that time they can lay up to 300 eggs each. Fruit Flies Figure 2: Fungus gnat life cycle. Gnats enjoy the damp places in the glasshouse. Lifecycle of a Fungus Gnat: The lifecycle of a fungus gnat can be divided into four stages – egg, larva, pupa, and adult. The life cycle takes about four weeks under normal spring and summer weather conditions, but it is in continuous reproduction in homes or greenhouses where warm temperatures are maintained. > Life cycle and general description of fungus gnats. Gnats have a short life cycle but reproduce prolifically. To successfully get rid of fungus gnats for good, you need to know something about their lifecycle. Fungus Gnat Biology and Life Cycle. Adults are weak fliers and often found near light sources or along the soil surface. They complete their life cycle in about four weeks depending on temperature and other environmental conditions. The gnats have a quick lifecycle and multiply prolifically. Female, adult fungus gnats will lay up to 300 eggs in on the surface of the moist soil or in the soil cracks. Fungus gnats reproduce in moist, shaded areas in decaying organic matter such as leaf litter. The Diptera are insects that metamorphose, or alter shape, completely. Fungus gnats develop in moist, often-shaded areas in decaying organic matter such as leaf litter. Life Cycle of Fungus Gnats The fungus gnat life cycle has 4 stages: Egg - Eggs are laid by adult females into the cracks and crevice of most soil, not directly on the soil surface. In homes, they usually are seen in the near vicinity of an infested houseplant. Larva - There are 4 larval stages, characterized by a black ‘head capsule’. The fungus gnat life cycle is quick, and they can quickly take over your entire interior plants if they are left untreated. The adults themselves generally do little harm; it is the larvae that do the damage. Life Cycle. Adult fungus gnats are small (1/8 inch long), black-gray flies with long legs, many segmented antennae and a single pair of grayish transparent wings with a Y-shaped vein near the wing tip. These eggs hatch into larvae in about three days. Fungus gnats are attracted to light, so they can usually be found flying around lamps and windows. 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