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