The fungus gnat is about the same size as a fruit fly, and generally found attacking plants indoors. Adults are weak fliers and often found near light sources or along the soil surface. Figure 2: Fungus gnat life cycle. Fungus Gnats are small black flies that roam around the house predominantly in autumn and winter. The fungus gnat life cycle is quick, and they can quickly take over your entire interior plants if they are left untreated. Gnats enjoy the damp places in the glasshouse. You may also see fungus gnats on cannabis. 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. 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. The gnats have a quick lifecycle and multiply prolifically. Life Cycle. > Life cycle and general description of fungus gnats. The breeding and reproduction patterns are reasons to eliminate gnats as soon as possible. Fungus gnats develop in moist, often-shaded areas in decaying organic matter such as leaf litter. 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. Adults emerge about one week later. The adults themselves generally do little harm; it is the larvae that do the damage. Fungus gnat adults are weak fliers, typically flying in short, erratic patterns. Fungus Gnat Life Cycle. 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. 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. 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. To successfully get rid of fungus gnats for good, you need to know something about their lifecycle. They are only seen as adults, since the other three stages of their life cycle are too small to … Reproduction and Life Cycle of Fungus Gnats. 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. In homes, they usually are seen in the near vicinity of an infested houseplant. Fungus gnats can be annoying to gardeners, homeowners with indoor plants, and greenhouse operators. Fungus Gnat Biology and Life Cycle. However, adult flies may disperse short distances and … Life Cycle of Fungus Gnats. 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