Each part of the four-stage Fungus gnat life cycle takes only a handful of days to complete. When watering landscapes, use the "deep but infrequent" technique, rather than the "frequent but light" technique. Each part of the four-stage Fungus gnat life cycle takes only a handful of days to complete. If watering practices are not altered, particularly during fall and winter, the growing medium will remain moist, which improves conditions for fungus gnat development. As a result, residents will soon notice adult Fungus gnats swarming around plants, windows, and lights. Preventing Fungus gnats can be as simple as not overwatering indoor plants or else tossing away infested plants. Since a gnat’s lifespan is so short, generations overlap and mature in the same location. If the problem is seasonal, i.e., it declines or totally disappears in the fall/winter, then quite possibly the source is outdoors. | Columbus, Ohio 43210 | 614-292-6181 Unless you can access and treat the source then, once the chemical dissipates, more flies are likely to appear. Along with homes and greenhouses, they can disturb guests at hotels and outdoor restaurants. However, they can occur during any time of year in moist coastal regions. These gnats are members of the genus Liohippelates. Mating often occurs in flight when females fly into swarms of males. israelensis (Bti) when applied as a drench to the growing medium. Individuals who use agricultural chemicals are responsible for ensuring that the intended use complies with current regulations and conforms to the product label. 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. Within about two days, the new adults are ready to breed and begin a new generation. Females produce about 500 eggs in a lifetime. Contact your local county Extension office through our County Office List. The pests produce several generations each year and don’t require much time to mature. The larval stage lasts about 10 days before reaching the pupal stage. Fungus gnats and dark-winged fungus gnats are found throughout the United States and occasionally become a nuisance indoors when adults emerge in large numbers from potted plants, from flower boxes containing damp soil rich in humus, or from heavily mulched flower beds. Gnat larvae have white or clear bodies, no legs, and shiny black heads. Eggs are white, oval, smooth, shiny, semitransparent, and barely visible to the naked eye. A biological control option for control of fungus gnat larvae is applications of certain insect parasitic (or entomopathogenic) nematodes as a drench to the growing medium. Adults are weak fliers and often found near light sources or along the soil surface. Second, fungus gnats may be more noticeable during cooler weather, when people spend more time indoors, thus increasing the likelihood that fungus gnat populations will be highly noticed. Larva - There are 4 larval stages, characterized by a black ‘head capsule’. The key to solving indoor fungus gnat problems is to find and eliminate the source, i.e., find the area(s) of excess moisture. Houseplants taken outside during warm weather may become infested with insects before being brought back indoors. Generations often overlap, with all life stages present during the breeding season. Non-Chemical Control However, adult flies may disperse short distances and … Enter a zip code below to view local branches. What is the Fungus Gnat Life Cycle? For an accessible format of this publication, visit cfaes.osu.edu/accessibility. The life cycle can range from 11 days to three months depending on conditions like temperature and moisture. Gnats have a short life cycle but reproduce prolifically. Check areas where moisture is commonly found: kitchens, bathrooms, utility rooms (e.g., a leak in the waterline to a clothes washer), as well as crawlspaces (which are more common in residential buildings). Their life cycle is dependent on temperature. A+ BBB Rating. Fungus gnat swarms can annoy residents, with larval stage feeding damaging plant roots over time. Try to determine what areas of the building have the highest numbers of gnats. This active ingredient is available in a number of houseplant insecticide formulations as granules, slow-release “spikes”, and in combination sprays with a pyrethroid-based insecticide. They can be both biting and non-biting. Occasionally, fungus gnats become a nuisance indoors in both residential and commercial buildings when adults emerge in large numbers from potted plants or some other chronic source of moisture (and subsequent mold growth). At typical room temperatures (65 F to 75 F) the life cycle (egg to adult) may be completed in three to four weeks (Figure 1) with continuous reproduction occurring yearround on indoor plants. Fungus gnats are not the same as fruit flies, but copy them very closely. Among the less hazardous products available to consumers are those containing Bacillus thuringiensis var. The adults are attracted to yellow and will be captured on the sticky cards. Fungus Gnat Biology and Life Cycle. They can either be biting or non-biting and typically form large swarms of adults. These products can be applied as soil drenches to potted plants indoors or to outdoor areas. Accessibility Accommodation. If it appears that the fungus gnats are entering the house or building from the outside, use of a perimeter treatment strategy may be advised. However, for an ongoing problem, adult fungus gnats can be easily knocked down and killed with aerosols labeled for control of gnats or flying insects. Woodchip-type mulches often promote the growth of fungal layers. Correcting a moisture problem and cleaning the area should eliminate the fungus gnats fairly quickly. Larvae will migrate to the potato and start feeding within a few days. Give us a call: 844-513-8257. The process from egg to adult takes about 7 days. 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.

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