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