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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]
