The gnats have a quick lifecycle and multiply prolifically. Fungus gnat adults are weak fliers, typically flying in short, erratic patterns. The female can lay up to thirty eggs a day - two hundred in total. Gnats enjoy the damp places in the glasshouse. Fungus Gnats are small black flies that roam around the house predominantly in autumn and winter. Although the adults are harmless, their larvae may begin to attack the roots when a large infestation is present. The Diptera are insects that metamorphose, or alter shape, completely. The fungus gnat life cycle is quick, and they can quickly take over your entire interior plants if they are left untreated. 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. They are only seen as adults, since the other three stages of their life cycle are too small to … Adults are weak fliers and often found near light sources or along the soil surface. 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. Fungus gnats are not the same as fruit flies, but copy them very closely. Reproduction and Life Cycle of Fungus Gnats. In about 4-6 days these eggs hatch into larvae and begin snacking on the roots of your plants in the moisture rich soil. Figure 2: Fungus gnat life cycle. > Life cycle and general description of fungus gnats. Life Cycle of Fungus Gnats. Fungus gnats quickly go through four stages of development. Most of the fungus gnats are female and can lay up to 300 eggs in the crevices of the soil, and the fungus gnat eggs will hatch into larvae within six days. Gnats have a short life cycle but reproduce prolifically. Life Cycle. 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. Fungus Gnat Life Cycle. The breeding and reproduction patterns are reasons to eliminate gnats as soon as possible. Life Cycle - Up to thirty days. This video is a short presentation of the life cycle of the sciarid Bradysia ocellaris. However, adult flies may disperse short distances and … Fungus gnats can be annoying to gardeners, homeowners with indoor plants, and greenhouse operators. Fungus Gnat Biology and Life Cycle. Larvae are considered the most dangerous life stage to gardeners, because they cause root damage and are linked to the spread of fungal problems. They complete their life cycle in about four weeks depending on temperature and other environmental conditions. In homes, they usually are seen in the near vicinity of an infested houseplant. The fungus gnat is about the same size as a fruit fly, and generally found attacking plants indoors. The adults themselves generally do little harm; it is the larvae that do the damage. 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