Berta - A wide variety of flies, wasps, beetles, etc. seek shelter to overwinter, as others have indicated. If the tower has wooden, double-hung windows, they often gain entrance where the two sections overlap horizontally in the center. This can be solved by installing a strip of foam in this gap. Here in the U.S. we have rolls of varying widths of foam with self-adhesive backing for such an installation.
Another way they gain access is at the edge of the double-hung window where the window frame meets the track. From here they often find the openings around the pulley at both sides of the track frame and fill up the void where the rope and window weight are located. When they emerge in warm weather, they can then squeeze their way into the interior from interior gaps in the track. Double-hung windows are rarely snug in their tracks. Often, museums will use Velcro strips around the entire perimeter of the interior molding and install Plexiglas UV filter sheets affixed to the Velcro. This will prevent anything from gaining access to the interior. You may however end up with a large accumulation of dead flies in between the window and the Plexiglas. The Velcro strips make it simple to remove the Plexiglas and vacuum up the dead flies once the emergence has ended. If you want to trap them, purchase a tubular black light and a timer. Set the timer to go on each night for 3 or 4 hours. Lay the black light on the floor and surround it with sticky boards (glueboards). Buy a box of glueboards because you'll be filling them up in no time. Start your trapping in the fall and again in the spring. You'll be amazed at what you trap. Thomas A. Parker, PhD President, Entomologist Pest Control Services, Inc. 469 Mimosa Circle Kennett Square, PA 19348 610-444-2277 610-444-2615 Fax -----Original Message----- From: Berta Blasi <[email protected]> To: pestlist <[email protected]> Sent: Thu, Mar 31, 2011 8:16 pm Subject: Re: [pestlist] A fly plague?! This is a message from the Pest Management Database List. o post to this list send it as an email to [email protected] o unsubscribe please look at the footer of this email. ---------------------------------------------------------- Dear David, Thank you very much for your fast response. guess it's the common fly and I think you're right. But: what do I have to do to avoid this behaviour? ll the windows are closed, also the doors. aybe some kind of trap? t will happen every year from Autumn to Winter? t means that they will wake up shortly and start to fly arround the ower? Thank you again, -- erta Blasi onservació - Restauració ocument Gràfic ww.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] ------------------------------------------------------------ o 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" ny problems email [email protected]
