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Berta, I, too, think they are cluster flies, given their location and behavior. This is the time of year you see them. They are worm parasites, requiring access to worms for their life cycle. In the fall they enter buildings through cracks. To reduce or eliminate them you need to get rid of worms outside in the ground. My preference is to compact the ground with a roller. You just need no worms in the top foot or so. You could also pave the ground (more drastic). What you don't want is lots of fluffy garden beds - which will have lots of worms close to the surface. You can also caulk and seal the outside cracks and crevices of your building. I wrote an article on cluster flies a number of years ago. I will try to dig it up. I don't remember the distance out from the building required to keep them from appearing inside, but it wasn't a great distance. If I can't find the article, the information came from BIRC (Bio-Integral Resource Center) in Berkeley, CA. Best, Helen Alten Northern States Conservation Center On Berta Blasi <[email protected]> wrote: > This is a message from the Pest Management Database List. > To post to this list send it as an email to > [email protected] > To unsubscribe please look at the footer of this email. > ----------------------------------------------------------- > > > > > > > > > > > > Dear David, > > Thank you very much for your fast response. > I guess it's the common fly and I think you're right. > > But: what do I have to do to avoid this behaviour? > All the windows are closed, also the doors. > Maybe some kind of trap? > It will happen every year from Autumn to Winter? > It means that they will wake up shortly and start to fly > arround the tower? > > Thank you again, > --- > Berta Blasi > Conservació - Restauració > Document Gràfic > www.bertablasi.com > [email protected] > (0034) 626 266 293 > > El 31/03/2011, a las 17:47, David Pinniger escribió: > > > This is a message from the Pest Management Database > List. > > To post to this list send it as an email to > [email protected] > > To unsubscribe please look at the footer of this email. > > > ----------------------------------------------------------- > > > > > > > > > > > > > > > > > > > > > > > > It needs a close up of a fly to be certain, but they > are probably > > cluster > > flies which come indoors every Autumn to hibernate over > winter. > > The main species in the UK is Pollenia rudis which > breeds in > > earthworms in > > grassland. The adults love sunny towers. > > They are harmless but can be a great nuisance, and the > bodies will > > provide > > food for pests such as Anthrenus and Attagenus. > > David Pinniger > > > > -----Original Message----- > > From: [email protected] > [mailto:[email protected] > > ] > > On Behalf Of Berta Blasi > > Sent: 31 March 2011 15:06 > > To: [email protected] > > Subject: [pestlist] A fly plague?! > > > > Dear colleages, > > > > I have a plague of indestructible flies in the archive. > > The archive is placed in the high of a tower, in a room > of 20m2 and > > long ago > > it was a jail. > > There are million stunned flies (they do not fly, they > only move > > when you > > touch them). > > The room is approximately at 10ºC and 50-55% of > humidity. There is no > > directly beam of sun because the windows are closed if > there is > > nobody (it > > means most of the time). It is cleaned in depth from > time to time > > but the > > flies always re-arise. > > The flies stay between the glass of the windows and the > shutter as > > you can > > see in the photo and also on the floor. I have never > seen so many > > flies > > together! > > Which can be the reason? What are they eating? In the > archive we > > didn't > > detect any dead animal but that keep on reproducing > continuously. > > What do we have to do? > > > > Thank you very much for your help. > > --- > > Berta Blasi > > Conservació - Restauració > > Document Gràfic > > www.bertablasi.com > > [email protected] > > (0034) 626 266 293 > > > > > > > ------------------------------------------------------------ > > To send an email to the list, send your msg to > > [email protected] > > > > To unsubscribe from this list send an email to > > [email protected] and in the body put: > > "unsubscribe pestlist" > > Any problems email [email protected] > > > > > > > > > > > > > > > > > > > > > > > > ------------------------------------------------------------ > To send an email to the list, send your msg to > [email protected] > > To unsubscribe from this list send an email to > [email protected] and in the body put: > "unsubscribe pestlist" > Any problems email [email protected] > > > > > > > > > > > Helen Alten Director Northern States Conservation Center www.collectioncare.org www.museumclasses.org ------------------------------------------------------------ To send an email to the list, send your msg to [email protected] To unsubscribe from this list send an email to [email protected] and in the body put: "unsubscribe pestlist" Any problems email [email protected]
