![]() They do this too when they are warmed up by central heating in a room or sun on a window. Their hibernation makes the Cluster Flies slow and dozy so when they are disturbed they move slowly, tumble around and fly clumsily. And you might find that you get the problem year after year because the flies are attracted to the same places for each hibernation. There are normally a lot gathered together too, sometimes thousands. Sometimes you’ll see the different types mixed together, sometimes just one type. The most horrible cluster fly is nearly as big as a blue bottle and hairy. If you have cluster flies you might see different types small, large, green, yellow, ones that look like a house fly, long legged flies. These are not the same as the blue bottles that buzz hard against the windows in the warmer weather, or the house flies and smaller flies that are active in summer too.Ĭluster flies cause a nuisance by moving in to roof spaces and cracks and crevices around windows in autumn and hibernating there until until spring. There’s more information below as well to help you identify pest problems.įlies that gather in roofs, around windows and on walls inside in the autumn and winter are called Cluster Flies, also known as Attic Flies. We really do know what we’re doing you can trust us to get it right. And we’re available 7 days a week for advice and help. We’ve 30 years experience in pest control, provide free pest control surveys and free insect identification for problem insects. If in doubt, ring or email us for professional pest control advice on how to identify pest flies and control fly infestations and how to get rid of flies. If the fly control is wrong then the fly problem could get out of hand unpleasant and unhealthy and especially bad for businesses and food premises. It’s important to identify the pest flies correctly so that the proper fly control is used. ![]() And then you have to decide if you need to do anything about it – and what to do. If you have no options at all for suitable hibernation places, then Butterfly Conservation recommends keeping the butterfly cool, to minimise activity, and then to release it back outside during a spell of sunny weather.Sometimes it can be difficult to decide if you’ve actually got a pest problem or not. It is important to remember that the butterfly will need to be able to escape when it awakens in early spring, so it’ll have to be regularly checked on or have an obvious exit to fly free. Once calm, you may be able to gently encourage the sleepy butterfly out onto the wall or ceiling of an unheated room or building such as a shed, porch, garage or outhouse. To do this, you’ll first need to catch the butterfly carefully and place it into a cardboard box or similar and store in a cool place for half an hour or so to see if it will calm down. The best thing you can do is to rehouse the butterfly to a suitable location. Butterfly Conservation is often asked what to do with a hibernating butterfly in your home, garage or shed. It is often a problem for the concerned householder in winter, how best to help these poor confused butterflies unwittingly tricked into thinking spring has come early. This presents a major problem for the butterfly as the outside weather conditions may be very hostile and there is little winter nectar available in gardens. However, come Christmas, when the central heating is often cranked up, such butterflies may be awoken prematurely by high indoor temperatures. They come in during late summer/early autumn when it is still warm outside and our houses appear to provide suitably cool, sheltered dry conditions. Those species that overwinter as dormant adults include some of the garden favourite butterflies brimstone, small tortoiseshell, peacock and comma.Īmong the butterflies, it is only the small tortoiseshell and peacock that regularly overwinter inside houses. Many butterflies and moths spend winter as a caterpillar, with pupae being the next most favourable choice, followed by eggs and adults. This can be as an egg, caterpillar, pupa or adult insect, dependent upon species. It is difficult for them to get warm and, therefore, be active and so they have evolved ways of dealing with this adverse season. So, not surprisingly, winter poses a big problem for butterflies and (most) moths in temperate climates such as ours.
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