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Best, Rachael IPM-WG Co-Chair To unsubscribe from this list send an email to imail...@museumpests.net and in the body put: "unsubscribe pestlist" Any problems email l...@zaks.com > This is a message from the Pest Management Database List. > To post to this list send it as an email to pestlist@museumpests.net > To unsubscribe please look at the footer of this email. > ----------------------------------------------------------- > > > > > > > > > > > > > Please remove my email address from your mailings. > > > Thank you. > > > Ann Wright-Parsons > > > awpars...@niu.edu > > > > > Ann Wright-Parsons > Director, Anthropology Museum > Department of Anthropology > Northern Illinois University > DeKalb, Illinois 60115 > > Phone-815-753-0230 > Fax-815-753-7027 >>>> "Michaela Berner" 02/17/11 12:02 PM >>> > Thank you for all the interesting responses. > We will consider the density of the pieces to be treated under this > conditions, assume that Thylodrias react like other dermestid beetle and > hopefully get rid of the infestation. > > Michaela Berner > > -----Message d'origine----- > De : pestlist-ow...@museumpests.net > [mailto:pestlist-ow...@museumpests.net] De la part de Anderson, Gretchen > Envoyé : jeudi 17 février 2011 17:06 > À : pestlist@museumpests.net > Objet : RE: [pestlist] effect of freezing on Thylodrias contractus > > > > Jerry * > > > > That was the original thought, however more recent research out of CCI > and others have shown that it is not necessary, more time consuming with > more potential damage to objects. Fast freeze and slow thaw is still > preferred. And of course, double bagging to reduce/eliminate extreme > relative humidity fluctuation, and danger of condensation. > > > It is also best to insert a temperature probe with any thermal treatment > (hot or cold). However what is best is not always possible. > > Gretchen > > > > > _____ > > > From: pestlist-ow...@museumpests.net > [mailto:pestlist-ow...@museumpests.net] On Behalf Of Jerry Shiner > Sent: Thursday, February 17, 2011 10:58 AM > To: pestlist@museumpests.net > Subject: RE: [pestlist] effect of freezing on Thylodrias contractus > > > > My understanding is that freezing to kill infestations is usually a two > stage process, with the first freezing followed by a warm up, and then > completed with a second freezing to kill any larvae that emerged after > the first freezing. I'm presuming that this may be needed even if the > insects are subjected to extreme cold. > > > > I know that heat treatments can be controlled by inserting a temperature > probe (into the very centre of the most thermally resistant objects) and > heating the objects until the desired temperature is reached. I see no > reason why this can not be done for freezing, especially if the job is > large and the purchase of appropriate measuring instruments is > justified. > > > > js > > > > Jerry Shiner > > Keepsafe Microclimate Systems > > 800 683 4696 www.keepsafe.ca > i...@keepsafe.ca > > Specializing in the design, procurement, and installation of > environmental control systems in museums and archives. > > > > > > -----Original Message----- > From: pestlist-ow...@museumpests.net > [mailto:pestlist-ow...@museumpests.net] On Behalf Of Anderson, Gretchen > Sent: Thursday, February 17, 2011 10:36 AM > To: pestlist@museumpests.net > Subject: RE: [pestlist] effect of freezing on Thylodrias contractus > > Michaela * > > > > Let me add to what Tom is saying. There are several factors to balance > when applying thermal treatments. First is the critical temperatures * > and -20 deg C is usually manageable, and many of the tests have been > done at that temperature. Second, the length of time can be determined > by the density of the pieces in question. Herbaria and archive material > are often treated as stacks or blocks of paper based materials * it > takes longer for the center of the material being treated to get to the > critical temperature. > > > >>From my own experience (I was involved in moving a collection in which > Thylodrias contractus was a known presence from an old building to a new > museum facility. We passed the entire dry biological (skins, taxidermy, > insects and skeletal collection) as well as other collections materials > that were susceptible to infestation through a walk-in freezer (we had > one * we had more time) that maintained -20 C. Each batch of > collections that went through were in the freezer for 1-3 weeks * > generally 2 weeks. We successfully knocked down the infestation by 99%. > The collection went into new clean cabinets. There have been no > re-occurrences in storage for 10 years. > > > > One week at -20 should do it * but I usually recommend 2 weeks * > especially for a mass treatment such as this. > > > > I recommend going to Tom Strangs article on the CCI web-site as the > best way to determine the length of time and critical temperature. > > http://www.cci-icc.gc.ca/crc/articles/mcpm/chap06-eng.aspx#10c1a > > > > Good luck! > > Gretchen Anderson > > Conservator > > Carnegie Museum of Natural Hisotry > > > > > _____ > > > From: pestlist-ow...@museumpests.net > [mailto:pestlist-ow...@museumpests.net] On Behalf Of bugma...@aol.com > Sent: Thursday, February 17, 2011 9:47 AM > To: pestlist@museumpests.net > Subject: Re: [pestlist] effect of freezing on Thylodrias contractus > > > > Michaela - > > > > First let me say you cannot compare the results of freezing cigarette > beetles in herbaria materials to the Odd Beetle. Cigarette beetles in > herbaria materials are usually found in dried plant materials in a plant > press. The stack of plant materials in a plant press insulates the > various stages of the beetle and will often result in a freezing > failure. Many herbaria use heat instead of freezing to disinfest dried > plant specimens. > > > > I can find no information in Tom Strang's paper, "A Review of Published > Temperatures for the Control of Pest Insects in Museums", Collection > Forum, 8(2), 1992, pp. 41-67, which refers specifically to the Odd > Beetle. Being a dermestid beetle, I would assume it would take a week > to insure complete kill at -20 degrees C. > > > > Tom Parker > > > > > > > > > > -----Original Message----- > From: Michaela Berner > To: pestlist > Sent: Thu, Feb 17, 2011 6:27 am > Subject: [pestlist] effect of freezing on Thylodrias contractus > > > > Dear colleagues, > > > > I am trying to get some specific information about the effect of > freezing on Thylodrias contractus. > > > > In the actual situation of a museum (moving collections in difficult > conditions, chest freezer of the museum overloaded) the institution > planed to rent a freezer truck for treating a part of the collection. > It seems that there will be no way to reach at least the temperature of > -25°C in the available freezer truck, only -20°C. It was planed to treat > one week at -20°C. > > > > I am concerned about this short time of treatment at on only * 20°C and > I have doubts about the effectiveness, especially because eggs of > Thylodrias contractus could be present. I would rather recommend, if > lower temperatures cannot be applied, two-three weeks of treatment in > order to compensate for the higher temperature. > > My doubts are reinforced by the experience of the Herbarium of the > Academy of Natural Sciences in Philadelphia *: after treatment at -20° C > for one week, larvae of Thylodrias were found (the targed beetle was > the cigarette beetle); the cold was suspected to act as a natural > trigger for the hatching of the eggs. > > > > -Has anyone studied the effect of freezing on Thylodrias contractus at > different stages, different temperatures and different time of > treatment? > > > > - Does any museum or institution noticed the reappearance of Thylodrias > after freezing at only * 20°C? > > > > > > * 2004. Lesson in Integrated Pest Management (IPM): the herbarium of > the Academy of Natural Sciences, Philadelphia. Society for > Preservation of Natural History Collections (SPNHC). Sasha Eisenmann, > James Macklin and Lucinda MC Dade, Department of Botany ANPS, > Philadelphia. Poster presentation. Annual Meeting, NewYork city. > > > > > > Thank you in advance for any information > > > > Michaela Berner > > Biologist > > Consultant > > 14, rue Mayet > > 75006 Paris France > > tel: 00 33 /(0)1 44 49 99 81 > > > The information contained in this message and/or attachments is intended > only for the person or entity to which it is addressed and may contain > confidential and/or privileged material. Any review, retransmission, > dissemination or other use of, or taking of any action in reliance upon, > this information by persons or entities other than the intended > recipient is prohibited. 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Any views expressed in this message are those of the individual > sender. -- > > > > ------------------------------------------------------------- > To send an email to the list, send your msg to pestl...@museumpests.com > > To unsubscribe from this list send an email to > imail...@museumpests.net and in the body put: > "unsubscribe pestlist" > Any problems email l...@zaks.com > > > > > > > > > > > > > ------------------------------------------------------------- To send an email to the list, send your msg to pestl...@museumpests.com To unsubscribe from this list send an email to imail...@museumpests.net and in the body put: "unsubscribe pestlist" Any problems email l...@zaks.com
