Flying in the attic / in the converted attic - what helps?

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Fly in the attic

Even flies are capable of learning and warm in winter, and so some species of these insects have discovered human habitations to "comfortably hibernate". For people with houses whose facades are warmed by the sun and are in a natural environment, not beautiful; but it is a nuisance, not a catastrophe with terrible consequences. This harassment can be kept to tolerable levels, through cleaning, some tricks and preventive measures for the future:

Flying in autumn, winter, spring

The following flies like to nest in the warm interior for wintering:

Block fly, worm fly, Pollenia rudis

The fly named "Graugelbe Polsterfliege" is called "cluster fly" in the English speaking world because of its habit of appearing in large clusters = accumulations in (undeveloped) attics and similarly rarely used rooms. As a consolation, the fly swatter on the insect is said to plunge the room into a pleasant fragrance, because crushed "buckwheat flies" smell like "buckwheat honey" (buckwheat honey). The thick black fly can be easily confused with the normal house fly; but it is not a normal house fly (housefly, Musca domestica), which belongs to the family of the "real flies" and is rather a single copy on the way.
The obtrusive hibernation guest belongs to the family of blowflies, which are named after the Old High German "throw" = smear, sully, because they have an unpleasant predilection for odorous organic substances. Not the substances that people want in their homes, which is why many people find flies disgusting. This is not absolutely necessary with the normal house fly, the passion of the housefly already described in Brehm's animal life as "naschhaft" is sugar in every form, which is not hygienic catastrophe of foreign fruit.
Even the tastier "cluster flies" did not smell any corpses in the attic; they are looking for nothing else than hibernation. The flies take in winter shelter no more food and they do not multiply.
How to recognize the worm fly:
  • Just under a centimeter tall (a bit bigger than house flies)
  • The golden wings overlap at rest (housefly: wings stay separate)
  • Black bristles on the middle of the body, finer golden hair on the sides
  • On the abdomen a pattern of silvery gray and black spots
  • Lazy compared to the lightning fast house flies
You have good chances of visiting the flies if your house facade is well irradiated by the sun for part of the day. When the first night frosts threaten, the flies gather on such warm facades to approach from there to the winter quarters; through open windows, mini-columns in the fa├žade, through roller shutter boxes or under bricks. And the block flies are coming back, because good experiences are obviously passed on to the next generation - entomologists have investigated that several generations repeatedly fly to the same winter quarters.

Other types of wintering in winter

Other potential loft guests are the stable or fly Musca autumnalis (behind are bright and usually not as numerous as the cluster flies) and the culm fly Thaumatomyia notata (tiny, yellow-black flies with a fondness for tall buildings, next to a church, for example. stay away from the visit usually).
If the wormflies do not romp peacefully "sleeping" but vigorously, it's because of a series of warm, sunny fall-winter days, or you have the heating turned on, or it's getting spring and the flies wake up from hibernation. The flies then become active and orient themselves towards the light, when in spring comes from outside, you will release the flies by opening the window or the skylight.

Dealing with the fly plague

Honestly, the easiest way is for undeveloped, unused attics if you just let the flies hibernate and wait until they fly out in the spring. Then you can include the attic in the spring cleaning, "armed" with a really well-absorbent construction vacuum cleaner (borrow at the nearest rental equipment center at the hardware store). This way, you can quickly eliminate any fly remnants even in cracks and angles, and after wiping with a hygiene cleaner, your attic radiates as if no fly had ever strayed there.
Tip: A new wintering guest is the Asian ladybug Harmonia axyridis, which knows no winter cold from its homeland and therefore in October / November in large swarms appropriate winter quarters refers. Not only attics, in the US they appear so regularly in living rooms that they were nicknamed "Halloween Ladybird".Regarding lockout, removal and fighting, they are treated like flies, but there is a better reason to leave them as quiet as possible: When the ladybirds panic, they react with so-called reflex bleedings, in which they are bitter and foul-smelling Spraying liquids - even in inaccessible roof liners.


It's not possible to let fly in the attic, because flies bring dangerous germs into the house? Right, flies pick up germs with their proboscis and feet when searching for food; If you live next to a Tropical Tropical Disease Hospital, these germs could be dangerous. Just kidding, normal flies, of course, also bring only normal germs from the environment - and these are germs that are buzzing in the air all day long anyway; in addition to the more than ten thousand different bacterial species that live as a microbiome on and in humans. If the flies in your attic do not have to fight through puddles, these germs, which are dependent on moisture for all their lives, are either dead or encapsulated in noncontagious permanent forms after a few hours. If you realize that in terms of contagion, the nearest supermarket and subway are a hundred times more dangerous than flies, the flies in the attic are already a good deal more harmless.
Unfortunately, flies in winter quarters only remain inactive when winter temperatures remain low. Bright winter sun awakens the flies in the middle of winter, the lower house area radiates light and warmth through the attic access, or the flies have in any case "boarded" an adjoining room heated in the winter. Of course, if the flies unfold anywhere near you, or if you move from the attic to the living room, you have to take action, you have the following options:
  • Flies that have just entered the house can be tackled with every tangible fly trap
  • Those who do not want to kill the flies because of the dramatically declining number of insects, take biological fly traps, which are emptied outdoors: glasses with Obstresten and durchlochten foil cover
  • Worm flies, with their laziness and the habit of gathering in heaps, are an invitation to a sporty quarter hour with the fly swatter
  • With open windows / skylights, a large part of the overwintering guests will escape in the face of the violent attack on the outside
  • If the early fight failed because the "move" was not noticed in time, the loft should occasionally be visited with the vacuum cleaner
  • Because some of the flies usually die in winter quarters (the drier the rooms, the sooner)
  • Undefended dead flies attract pests that really do not catch until you find carrion in the attic


Even the "panic press" hardly dares to call for the "fight against flies", but there are situations in which wintering in the attic can not be tolerated. For example, if your own crop is drying there:
  • The entrances can be secured with anti-insect adhesive strips (containing contact poison + attractant)
  • Wintering flies can be destroyed with UV insect traps
  • At a maximum height of 1.5 m they catch most flies
  • The traps should not be visible from the outside, competition lighting should be avoided
  • They work best in a really dark environment
  • But need regular maintenance: Depending on the model, empty the drip tray + clean or replace the adhesive foil
Tip: When buying UV insect traps good advice is not in sight: Stiftung Warentest has not yet examined the products; The numerous comparison portals, which now clog the Internet, write a lot and long, but little meaningful content. A few of the most beautiful quotes from test placements: "resembles an air freshener, which makes the product attractive to buy" (Huh), previous customers report success in catching insects (well, not telling future customers), for flying and Mosquitoes of usual size an ideal trap (if it does not work, the insects had unusual size?). At most electricians should be prepared for (meaningful) instructions on self-assembly of UV traps, but they should also take considerable time to find sources of supply for the very special adhesive films. You will most likely come to a useful device when you ask at the nearest bakery for the device you are using (of course only if it visibly works well).


If it is more about "a few herb bunches" that are hardly worth the effort, the following measures are conceivable:
  • If the dried food has been hanging for a while, finish drying in the oven at 40┬░ C and pack
  • Cover medium-sized quantities loosely with thin paper bags against "the crumbs"
  • Dry in a room that the flies have not yet discovered
  • and let the flies hang a "victim bouquet" in the loft, before you start trapping or just hibernate

Preventive measures

there are theoretically, first of all here are the quite normal measures that many people in the summer to life, so they do not "go down in flies". This refers to people who live in the countryside, care for near-natural gardens with a variety of plant species, have a stable or flower meadows or forests next to them, and the measures look like this:
  • Fly screens, used here just in winter and in front of all openings of the attic
  • Targeted use of fragrances, various essential oils can distribute flies
  • Fragrance lamps in the loft must be filled occasionally fresh
  • Experience has shown that most flies avoid lavender, peppermint and eucalyptus
  • Fly more frequently in autumn, flies are very sensitive to draft
  • In the critical time nowhere to leave food open, especially not near the attic
  • Essential oils etc. can be sprayed on the outside of the facade
  • For bright facades but necessarily long before ev on discoloration test
  • You can support this defense by anti-fly plants like lavender down the facade
  • Combined with an insect hotel in the backyard, this can even keep away "traditional guests"
  • Repair and maintenance of all windows, doors, hatches, roofs that keep insects in good condition
  • Simple cleaning always helps when flies often romp around in certain places
  • Trash bins should be tightly sealed and emptied more often
  • With increased fly volume, automatic door closers reduce the intrusion of the flies
However, you should not let anyone persuade the idea that you can make a house (with particularly novel, especially expensive fly screens etc.) "insect-proof". Older houses anyway not, but also in a new building you will not always be able to exclude all unwanted overwintering guests.
There are about 1.5 billion insects in every human being on earth (not appreciated, there are actually clever / crazy people who figure that out); Encounters between humans and insects are thus "not entirely unlikely".


But it is quite similar to the burglars: if your tons of living room table is visible to anyone made of solid gold (flies a wealth of uncovered food (scraps) on kitchen table and countertops "sniff"), a greedy burglar (a greedy insect) Regardless of how you secure your home. If in your house is only to get what is experienced in such houses to get, but access / approach at first glance is not easy, intruder / insect prefer to move on to the next house.

Take care when using insecticides

You can use insecticides in many places around the "overwintering guests":
  • Sometimes it is advised to spray the fa├žade with long-acting contact insecticides
  • Even fly screens or gauze can be thoroughly "put under insecticides"
  • As well as the attic accesses in the direction of the living area, including nets, curtains, seals
  • But "long-term effect" is relative, and entry to hibernation is not tied to a precise date
  • Experience has shown that the use of insecticides therefore rather low effectiveness
The use of insecticides should therefore be considered carefully; because it has a number of disadvantages for the user:
  • The funds are not only toxic to insects, Raid z. For example, DEET, spray), contains other means of pyrethroids,
  • Many of the remedies "stink to the sky", and unfortunately also strong down towards garden users
  • Flies in the attic can die in quantities in inaccessible places
  • Dead flies attract more pests
  • Inappropriate, excessive use of insecticides has already made many insect species resistant
  • Each use of insecticide produces further resistance
  • Avoidable assignments mean that there are no funds available for really critical cases at some point
Tip: Stay away from electrical equipment that claims to kill flies and mosquitoes outside buildings. First, it is not true, mosquitoes get lost only in single-digit percentages "on the grill plates", and the flies that want to hold them, at least as a repeat offender not at all, they know their goal. Secondly, many useful insects are braised alive, not a fair death, by the way. And third, the use of all these outdoor devices is prohibited because so many beneficial insects are stewed alive - which are used by us humans, here the call of the NABU against these devices: /rechtliche-grundlagen/fazit.html.

Special situations and measures

If you have pets that are fed near the fly shelter, you should either feed this food elsewhere in the spring or put it away immediately after eating.When the first warming sun shines and wakes the wintered flies, they only want to get rid of their eggs to ensure the survival of the species, cat food for example. B. is great for this (of course, applies to any type of food or food supply).
If your roof has just been repainted or insulated, a sudden "fly infestation" can be a sign that the work was not done as it should. In this case, check the entire layer construction together with a qualified person. Also a not developed for living roof truss, the fresh z. B. with aluminum-laminated glass wool insulation + vapor barrier film is insulated, is not so dense that no more insects can get through, but a mass immigration should be prevented by such an insulating layer. First of all, such a density is required, if the attic with a thicker insulating layer was developed for living, where many flies come in, also goes out a lot of heat, here must be repaired in the rule.

Video Board: Attic Fly Through Converted.

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