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Flies & Gnats

Stylized illustration of flies & gnats

By The Pest Guide Team · Updated
Edited by Fellipe Antequera · Editorial policy

What gathers these thirteen creatures into one catalog group is a streamlined flight plan built on a single pair of membranous wings, while their hind wings have evolved into tiny balancing organs called halteres that act like biological gyroscopes. Even though common names shove delicate drain gnats and bulky horse flies under the same broad umbrella, this group actually splits down the middle into delicate, long-antennaed gnats and stout, short-antennaed true flies that share little evolutionary kinship beyond that two-winged blueprint.

Telling this group apart from its four-winged neighbors in your home or garden usually comes down to counting wings, checking antennae, and looking at where the pests are congregating. If you see a furry little insect resting with its wings held in a tent shape over its body near a damp sink, you are looking at a drain fly rather than a moth, which has dusty, overlapping wing scales and a coiled mouthtube. If a pest has a narrow waist and four distinct wings like a wasp or a bee, it does not belong here either, since every fly and gnat in this collection relies exclusively on its two front wings to navigate.

Explore flies & gnats

Illustration of House flyHouse flyMusca domesticaIllustration of Fruit fliesFruit fliesFamily DrosophilidaeIllustration of Drain fliesDrain fliesFamily PsychodidaeIllustration of Phorid fliesPhorid fliesFamily PhoridaeIllustration of Cluster fliesCluster fliesPollenia speciesIllustration of Blow fliesBlow fliesFamily CalliphoridaeIllustration of Flesh fliesFlesh fliesFamily SarcophagidaeIllustration of Fungus gnatsFungus gnatsFamily SciaridaeIllustration of Horse fliesHorse fliesFamily TabanidaeIllustration of Deer fliesDeer fliesChrysops speciesIllustration of Black fliesBlack fliesFamily SimuliidaeIllustration of Biting midges / no-see-umsBiting midges / no-see-umsFamily CeratopogonidaeIllustration of Spotted wing drosophilaSpotted wing drosophilaDrosophila suzukii

Questions about flies & gnats

Flies & GnatsHow do you get rid of fruit flies in the kitchen?To get rid of fruit flies in the kitchen, find and toss what they breed in. Traps only catch adults, and a new generation appears in about a week.Flies & GnatsWhere do fruit flies come from?Fruit flies arrive as eggs on produce or as adults slipping through gaps and screens, drawn by fermenting smells like unrinsed cans and bottles.Flies & GnatsHow do you get rid of drain flies?Scrub the inside of the pipe with a stiff brush, then use an enzyme drain cleaner. Bleach and boiling water leave the slime where drain flies breed.Flies & GnatsWhy are there drain flies in the bathroom?Drain flies in the bathroom breed in the slimy film of soap, hair and bacteria inside the pipes. Larvae live in the slime for two to three weeks.Flies & GnatsDrain flies vs fruit flies: how can you tell?Learn how to tell drain flies and fruit flies apart by examining their appearance, flight habits, and breeding sources, and discover how to clear them safely.Flies & GnatsPhorid flies vs fruit flies: what is different?Fruit flies have red eyes and hover near sweet food. Phorid flies have dark eyes, a humpbacked look, and run across surfaces. They breed in different places.Flies & GnatsHow do you get rid of phorid flies in a house?To get rid of phorid flies, find and scrub out the damp, decaying sludge where larvae breed, often hidden in drains, grease or a plumbing leak.Flies & GnatsWhy are cluster flies in the house?Cluster flies move into walls in late summer to spend the winter. Indoor heat wakes them early, so they wander groggily into your rooms.Flies & GnatsWhy do cluster flies appear in winter?Cluster flies appear in winter when sun or heating warms wall voids and attics above about 50°F, waking them from hibernation.Flies & GnatsHow do you get rid of gnats in the house?To get rid of gnats, first identify them. Fruit flies, drain flies, phorid flies and fungus gnats each breed in a different spot you need to clear.Flies & GnatsHow do you get rid of fungus gnats?Fungus gnats breed in wet potting mix. Let the top two to three inches of soil dry between waterings, and use a Bti soil drench for heavy cases.Flies & GnatsWhy are fungus gnats in houseplant soil?Fungus gnats live in houseplant soil that stays wet, where fungi grow and feed the larvae. Some bags of potting mix arrive with eggs already in them.Flies & GnatsDo fungus gnats bite people?No. Fungus gnats have soft, reduced mouthparts and cannot bite people or pets. Bites blamed on them usually come from midges that got inside.Flies & GnatsDo yellow sticky traps help with fungus gnats?Yellow sticky traps catch adult fungus gnats and cut the number of egg layers, but they cannot reach the larvae in the soil. Here is what else to do.Flies & GnatsDo horseflies bite or sting?Learn whether horseflies bite or sting, how to identify them, and how to safely manage their painful bites.Flies & GnatsCan kissing bugs fly?Yes. Adult kissing bugs have two pairs of wings and can fly up to several miles. Nymphs have no wings and can only crawl.Flies & GnatsCan wood roaches fly?Adult male wood roaches fly well. Females have short wings and cannot fly, and nymphs have no wings. Here is how to tell them apart.Flies & GnatsWhat are little brown flying bugs in a house?Little brown flying bugs indoors are often pantry beetles, small flies, carpet beetles or wood-boring insects. Where you see them is the best clue.Flies & GnatsWhat do fruit fly eggs look like?Learn what fruit fly eggs look like, how to identify them with basic magnification, and what steps to take when you find them on produce.Flies & GnatsHow are fruit fly eggs dealt with?Deal with fruit fly eggs by removing what they are laid in: overripe produce, trash and drain scum. Refrigerate fruit. Sprays do not help.Flies & GnatsWhy are there fruit flies in the bathroom?Small flies in a bathroom are often drain flies breeding in pipe slime, not fruit flies. The damp room is full of hidden organic matter.Flies & GnatsWhat are drain fly larvae in a toilet?Drain fly larvae in a toilet are legless moth fly larvae feeding on slime under the rim or in the trap. Here is how to find and remove the source.Flies & GnatsHow do you get rid of drain fly larvae?Learn how to get rid of drain fly larvae by breaking through protective biofilm with physical scrubbing and microbial cleaners.Flies & GnatsWhat do fungus gnat larvae in soil look like?Fungus gnat larvae look like clear threads or grains of white rice, up to 1/4 inch, with a shiny black head and a dark gut line.Flies & GnatsWhat are no-see-ums?Learn what no-see-ums are, how to identify these tiny biting midges, and practical ways to keep them out of your home and yard.Flies & GnatsWhat do no-see-um bites look like?Learn what no-see-um bites look like, why they itch intensely, and how to identify biting midges from everyday skin reactions.Flies & GnatsCan no-see-ums get into a house?Yes. No-see-ums are only 1 to 3 mm long and pass through standard window screens. Night lights also draw them indoors.Flies & GnatsHow do you reduce no-see-ums in a house?Learn practical methods to reduce no-see-ums in your house through fine-mesh screening, air currents, lighting control, and proper exclusion.Flies & GnatsNo-see-ums vs gnats: how are they different?No-see-ums are tiny biting midges that feed on blood. Most indoor gnats do not bite at all. Here is how to tell which one is bothering you.Flies & GnatsAre no-see-ums common in Florida?Yes. No-see-ums are very common in Florida, especially near the coast, salt marshes, mangroves and damp inland waterways.Flies & GnatsWhat are biting midges?Learn what biting midges are, how to identify them, why their bites burn, and how to keep these tiny pests out of your home.Flies & GnatsHow do you tell biting midges from non-biting midges?Learn how to distinguish biting midges from non-biting midges by examining size, resting posture, mouthparts, and biology.Flies & GnatsCan biting midges enter a house?Yes. Biting midges are 0.8 to 3 mm and slip through standard screens, especially in humid, calm weather. Here is how to keep them out.Flies & GnatsDo horse flies bite humans?Yes. Female horse flies bite people, slicing the skin with blade-like mouthparts to feed on blood. Males only feed on nectar and pollen.Flies & GnatsWhy do horse flies bite?Female horse flies bite to get protein from blood to develop their eggs. Males never bite. Here is why horse fly bites hurt so much.Flies & GnatsHow do you reduce horse flies around a home?Learn how to reduce horse flies around your home using a layered defense of personal protection, physical exclusion, and targeted habitat management.Flies & GnatsHorse flies vs deer flies: how can you tell them apart?Learn how to distinguish between horse flies and deer flies using physical clues, size, and wing patterns.Flies & GnatsDo deer flies bite?Yes. Female deer flies bite aggressively, slicing the skin to feed on blood. Bites hurt instantly, then swell and itch. Males are harmless.Flies & GnatsWhat do black fly bites on dogs look like?Black fly bites on dogs look like small red spots, raised welts and dots of dried blood, usually clustered on thin-haired skin.Flies & GnatsWhy are black fly bites noticed on a dog's belly?Discover why black flies target a dog's belly, how to identify the bites, and what steps to take next for your pet's safety.Flies & GnatsDo black fly bites itch?Yes. Black fly bites itch intensely, usually starting an hour or more after the bite, as your immune system reacts to the fly's saliva.Flies & GnatsWhat are sand flies?Sand flies are tiny blood-feeding insects about 1/8 inch long. The name covers true sand flies and biting midges depending on the region.Flies & GnatsWhat are sand fly bites like at the beach?Beach sand fly bites feel like a hot pin prick, then become small, very itchy red welts by morning. Here is what is biting and how to cope.Flies & GnatsDo stable flies bite?Yes. Both male and female stable flies bite, using a rigid beak to pierce skin, usually on the ankles and lower legs.Flies & GnatsWhy are no-see-ums found in a bed?An explanation of why no-see-ums are found in a bed, how to identify them, and what practical steps to take.Flies & GnatsWhy do no-see-ums bite?Female no-see-ums bite because they need blood protein to make eggs. They slice the skin with tiny blades. Males feed only on nectar.Flies & GnatsWhy are drain flies appearing when they are not coming from a drain?Drain flies only need a slimy wet film, which can form in AC drip pans or damp crawl spaces. Or the flies may be phorid flies or fungus gnats.Flies & GnatsDrain flies vs gnats: how can you tell them apart?Drain flies are fuzzy and look like tiny moths, 1.5 to 5 mm. Fungus gnats are slender, long-legged and hover around houseplants.Flies & GnatsWill bleach kill drain flies?No. Bleach runs past the thick slime lining the drain and trap, and the drain fly larvae living underneath survive. Here is what works.Flies & GnatsDoes drain cleaner kill drain flies?No. Chemical drain cleaners flow straight past the slime where drain fly larvae live. Scrubbing or a biological gel is what removes them.Flies & GnatsAre spotted-wing drosophila larvae in fruit safe to eat?Spotted-wing drosophila larvae are not toxic, so eating them by accident is generally safe. Heavily infested fruit that has started to rot is another story.Flies & GnatsWhat smells do cluster flies hate?None. Cluster flies respond to temperature and daylight, not scent, so peppermint, lavender and clove oils do not keep them away.Flies & GnatsWhy are cluster flies suddenly appearing in the house?Cluster flies hibernate in wall cavities. Winter sun or heating wakes them early, and they crawl through gaps into the living space.Flies & GnatsDo phorid flies bite humans?No. Phorid flies have soft, spongy mouthparts that only soak up liquids, so they cannot pierce skin. They feed on moist decaying film.Flies & GnatsWhat are blow flies?Blow flies are shiny metallic blue, green or bronze flies, 1/4 to 1/2 inch long, with a loud drone. A swarm indoors often means a hidden dead animal.Flies & GnatsWhy are blow flies in the house?Learn why blow flies appear inside your home, how to identify them, and what practical steps to take next.Flies & GnatsHow do you get rid of blow flies?To get rid of blow flies, find and remove the dead animal or waste attracting them. Sprays only help briefly while new adults keep emerging.Flies & GnatsWhat is the life cycle of a blow fly?An explanation of the four-stage life cycle of the blow fly, including identification tips and management steps.Flies & GnatsHow quickly can blow flies detect a dead animal?Learn how quickly blow flies detect dead animals, how to identify them, and what steps to take for safe removal.Flies & GnatsWhy are flesh flies in the house?Flesh flies indoors usually come from a dead animal hidden in a wall void, where a female left live maggots that later became adults.Flies & GnatsDo flesh flies bite?No. Flesh flies have soft, spongy mouthparts made for soaking up liquids like sweat and nectar. They cannot pierce skin.Flies & GnatsHow do you get rid of flesh flies?Learn how to get rid of flesh flies by locating breeding sources, identifying key physical traits, and managing structural infestations safely.Flies & GnatsAre flesh flies dangerous?Flesh flies do not bite or sting, but they can carry germs from filth to indoor surfaces. Here is what their presence usually means.Flies & GnatsWhat are black flies?Black flies are small, dark, humpbacked flies. Females slice skin to feed on blood by day. They breed only in clean, fast-running water.Flies & GnatsWhy are black flies in the bathroom?Discover why black flies appear in your bathroom, how to accurately identify drain flies, phorid flies, and fungus gnats, and how to safely eliminate them.Flies & GnatsWhy are big black flies suddenly appearing in the house?Find out why large black flies appear in your house during winter and how to handle them properly.Flies & GnatsWhy are small black flies on indoor plants?Small black flies on houseplants are usually fungus gnats, often arriving as eggs in potting mix and thriving in overwatered soil.Flies & GnatsWhat repels black flies?Learn what actually repels black flies, how to identify them, and the most effective ways to protect yourself from their painful bites.Flies & GnatsWhat attracts horse flies to humans?Female horse flies home in on carbon dioxide, body heat, movement and dark shapes. Dark clothing makes you an easier target.Flies & GnatsHow can you repel horse flies from people?Learn how to effectively repel horse flies from people using skin repellents, treated clothing, and behavioral strategies.Flies & GnatsDo horse flies lay eggs in humans?No. Horse flies only take blood from people. They lay their eggs on vegetation near water or in moist mud, never in human skin.Flies & GnatsWhy are horse flies called horse flies?Horse flies got their name as major pests of horses and other large livestock. They belong to the family Tabanidae and feed by day.Flies & GnatsDo dragonflies eat horse flies?No. Dragonflies are general predators, but horse flies are big, tough, fast fliers, so dragonflies do not control their numbers.Flies & GnatsWhat are deer flies?Deer flies are biting flies 6 to 12 mm long with dark-banded wings and colorful eyes. Females slice skin to feed on blood on warm, sunny days.Flies & GnatsWhat repels deer flies?Learn what actually repels deer flies, how to identify them, and how to use EPA-registered repellents and permethrin-treated clothing safely.Flies & GnatsHow do you get rid of deer flies?Learn why deer flies cannot be eliminated area-wide and how to protect yourself using personal repellents, protective clothing, and physical barriers.Flies & GnatsDo fungus gnats kill plants?No. Fungus gnats rarely kill healthy, mature plants, but their larvae can damage roots and kill seedlings and cuttings in soggy soil.Flies & GnatsDoes BTI work for fungus gnats?An explanation of whether BTI works for fungus gnats, covering identification, application, and safety.Flies & GnatsDo beneficial nematodes help control fungus gnats?Yes. Beneficial nematodes hunt fungus gnat larvae in wet soil. Experts mostly suggest them for greenhouses rather than a few houseplants.Flies & GnatsDo fruit flies carry disease?Fruit flies can carry bacteria and fungi on their bodies to food and counters. At home this is usually a minor sanitation issue.Flies & GnatsAre fruit flies attracted to light?Not really. Fruit flies navigate by the smell of fermentation. Tiny flies swarming lit screens are usually fungus gnats or drain flies.Flies & GnatsHow fast do fruit flies reproduce?Fruit flies go from egg to adult in 7 to 10 days in a warm kitchen, and one female can lay about 500 eggs in her month-long life.Flies & GnatsWhy are fruit flies attracted to me?Fruit flies follow scent plumes from your skin, breath, sweat, lotions or drinks. They do not bite. If they chase your breath, they may be fungus gnats.Flies & GnatsWhy are there so many fruit flies in the house?Fruit flies come in from outside or on groceries. One female lays up to 500 eggs on fermenting food, and they become adults in about a week.Flies & GnatsDo house flies have antennae?Yes. House fly antennae are very short and tucked into a groove between the eyes, with a feathery bristle that senses air movement and temperature.Flies & GnatsDo house flies have two sets of wings?No. House flies have one pair of wings plus tiny balancing organs called halteres where the second pair used to be.Flies & GnatsWhat are little white bugs in houseplant soil?Learn what those tiny white bugs crawling in your houseplant soil actually are, how to identify them, and what practical steps you should take.Flies & GnatsWhat are little bugs on strawberries?Little bugs on strawberries are usually aphids, mites, fruit fly larvae or weevils. The type of damage on leaves, flowers or fruit tells you which.Flies & GnatsWhat are tiny bugs in a bathroom sink?Tiny bugs in a bathroom sink are usually drain flies, mold mites or booklice drawn to humidity, standing water and slime in the pipes.Flies & GnatsWhat are tiny black bugs in a bathtub?Tiny dark bugs in a bathtub are usually drain flies, booklice, silverfish or carpet beetle larvae, each drawn by something different.Flies & GnatsWhat are tiny bugs in a shower?Learn what tiny bugs in a shower are, how to identify them, and what practical steps to take for removal.Flies & GnatsWhy are water bugs in a shower?Shower water bugs are usually drain flies, booklice, silverfish or mold mites living on humidity, soap scum and mold, not true water bugs.Flies & GnatsWhat are tiny black bugs in a sink?Learn why tiny black bugs appear in your sink, how to identify them, and what practical steps to take next.Flies & GnatsWhy are bugs coming from a sink drain?Bugs from a sink drain are breeding inside the pipe or in damp spots around it. A water-filled trap normally stops pests from the sewer.Flies & GnatsWhat are very tiny bugs in a bathroom?Very tiny bathroom bugs are usually booklice, mold mites, drain fly larvae or silverfish feeding on moist debris and mold. Here is how to tell.Flies & GnatsAre no-see-ums common in Las Vegas?No. Las Vegas is too dry for biting midges to breed, except near overwatered turf or leaking irrigation. Something else is probably biting.Flies & GnatsWhy are tiny bugs gathering around windows?Learn why tiny bugs gather around windows, how to identify them, practical steps to deal with them, and when to call a professional.Flies & GnatsWhy are fungus gnats breeding in potting soil?Discover why fungus gnats breed in potting soil, how to identify them correctly, and practical ways to manage them at home.Flies & GnatsHow do you reduce fungus gnats without damaging a houseplant?Learn how to reduce fungus gnats safely without damaging your houseplants using moisture management and biological controls.Flies & GnatsFruit flies vs drain flies: which breeding source should you inspect?Learn how to distinguish between fruit flies and drain flies, locate their breeding sources, and take the right steps to eliminate them.Flies & GnatsFruit flies vs phorid flies: what can movement and habitat reveal?Learn how to distinguish between fruit flies and phorid flies by observing their unique movement and habitat choices.Flies & GnatsWhy are fruit flies gathering around a kitchen sink?Discover why small flies gather around your kitchen sink, how to identify the species, and practical ways to eliminate the breeding source.Flies & GnatsHow can you locate the source of fruit flies in a kitchen?Learn how to locate the source of fruit flies in your kitchen with a practical, step-by-step approach.Flies & GnatsWhy do fruit flies return after traps are emptied?Understand why fruit flies keep returning even after you empty your traps and learn how to locate the actual breeding source.Flies & GnatsWhat do drain fly larvae look like in a drain?Learn what drain fly larvae look like, where they hide in plumbing slime, and how to identify and clear them safely.Flies & GnatsDo drain flies mean a plumbing problem or ordinary buildup?Learn whether drain flies mean a plumbing problem or ordinary buildup, how to identify them, and what steps to take.Flies & GnatsWhen should persistent drain flies prompt a plumbing inspection?Learn when persistent drain flies indicate a hidden plumbing failure and require a professional inspection rather than simple cleaning.Flies & GnatsWhat do phorid flies suggest when they appear far from food?Learn what phorid flies suggest when they appear far from food, how to identify them, and what steps to take next.Flies & GnatsWhy are phorid flies appearing in a bathroom?Learn why phorid flies appear in bathrooms, how to identify them, and what steps to take to resolve the infestation.Flies & GnatsCluster flies vs house flies: why do they appear at windows?Learn why cluster flies and house flies gather at your windows, how to identify them, and what practical steps you should take.Flies & GnatsWhy are cluster flies in a house during winter?Learn why cluster flies appear inside houses during winter, how to identify them, and what practical steps you can take to manage them safely.Flies & GnatsWhat causes a sudden house fly infestation indoors?Learn what causes a sudden house fly infestation indoors, how to identify the specific pests, and practical steps to resolve the issue safely.Flies & GnatsFungus gnats vs fruit flies: how do houseplants change the answer?Learn the difference between fungus gnats and fruit flies, why houseplants change the equation, and how to manage soil pests safely.Flies & GnatsWhat outdoor conditions favor no-see-ums near a home?Discover what outdoor conditions attract biting midges to your home, how to identify them, and practical steps to keep them away.Flies & GnatsWhy are no-see-ums reported around Florida coastal properties?Discover why no-see-ums plague Florida coastal properties, how to identify them, and what practical steps you can take.Flies & GnatsBiting vs non-biting midges: which signs differ?Learn how to distinguish between biting and non-biting midges, understand their habits, and find practical ways to manage them safely.Flies & GnatsHorse flies vs deer flies: what habitat clues help?Learn to tell horse flies and deer flies apart using habitat clues, size, and wing patterns.Flies & GnatsHow can you reduce horse fly encounters around horses and people?Reduce horse fly encounters with fly masks, light clothing, EPA-registered repellents and stabling horses during the sunniest hours.Flies & GnatsWhy do black flies swarm in some outdoor settings?Black flies swarm after a mass emergence from fast streams, looking for mates or blood. Adults can travel 15 miles or more from water.Flies & GnatsCan a bite mark alone identify a black fly?Learn why a bite mark alone cannot identify a black fly, how to properly identify the pest, and what steps to take for treatment and prevention.Flies & GnatsWhat do spotted-wing drosophila larvae look like in berries?Learn what spotted-wing drosophila larvae look like in berries, how to identify them, and what practical steps to take next.Flies & GnatsWhy are spotted-wing drosophila found in strawberries?Learn why spotted-wing drosophila attack healthy strawberries, how to identify them, and what practical steps you can take to manage an infestation.Flies & GnatsWhat does an apple maggot fly look like?Learn what an apple maggot fly looks like, how to identify it, and how to manage infestations safely.Flies & GnatsWhy does an apple maggot quarantine area matter to home growers?Understand why apple maggot quarantine rules matter to home growers, how to identify the pest, and what management choices to make.Flies & GnatsWhat are tiny silver bugs in houseplant soil?Learn what tiny silver bugs in houseplant soil are, how to identify them, and how to manage them safely without guesswork.Flies & GnatsWhen is a pest problem also a plumbing or moisture problem?Learn how to connect household pest problems to underlying plumbing and moisture issues, featuring practical identification and remediation guidance.Flies & GnatsWhy are tiny bugs gathering around plumbing leaks?Discover why tiny bugs gather around plumbing leaks, how to identify them, and what practical steps you can take to stop them.Flies & GnatsWhy do sandflies bother visitors to New Zealand coasts?Discover why New Zealand coastal sandflies bite, how to identify them, and the practical steps to protect yourself during your trip.Flies & GnatsWhat can reduce sandfly exposure during New Zealand travel?Learn what reduces sandfly exposure during New Zealand travel, how to identify them by context, and practical steps to avoid bites.Flies & GnatsHow do Canadian homeowners identify black fly season locally?Learn how Canadian homeowners can identify black fly season through observable clues, physical traits, and typical bite reactions.Flies & GnatsWhy are black flies a concern in parts of Ontario?Ontario is crossed by countless fast, clean rivers, where black fly larvae grow. Adult females then swarm and bite aggressively during the day.Flies & GnatsWhat causes a sudden increase in flies indoors?Learn what causes a sudden increase in flies indoors, how to identify them by species, and how to handle the infestation properly.Flies & GnatsHow can you find the breeding source of small flies?Learn how to locate the exact breeding source of small flies in your home by identifying the species and checking common hiding spots.Flies & GnatsFungus gnats vs fruit flies: which one is near your plants?Learn the differences between fungus gnats and fruit flies, how to identify them around your plants, and what steps to take next.Flies & GnatsWhen is isolating an infested houseplant useful?Learn when isolating an infested houseplant is useful, how to identify common pests, and the safe steps for treatment and recovery.Flies & GnatsAre small flies in a bathroom fruit flies, drain flies or phorid flies?Learn how to distinguish between drain flies, phorid flies, fruit flies, and fungus gnats found in the bathroom, and find out how to treat them.Flies & GnatsAre “sand flies” the same species in New Zealand and North America?An exploration of whether sand flies in New Zealand and North America are the same species, featuring identification, practical control, and safety advice.Flies & GnatsWhy do moisture-loving pests show up after a leak?Mold and mildew start growing 24 to 48 hours after a leak, and moisture-loving pests that eat fungus move in to feed on it.

Research sources

This page was researched with publications from these institutions, then written and reviewed by The Pest Guide Team: