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