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Ah - yes, you're right. The wood is fragile. De : pestlist-ow...@museumpests.net [mailto:pestlist-ow...@museumpests.net] De la part de Voron, Joel Envoyé : 29 juin 2016 13:31 À : pestlist@museumpests.net Objet : Re: [pestlist] wood-boring beetle This is a message from the Museumpests.net List. To post to this list send it as an email to pestlist@museumpests.net<mailto:pestlist@museumpests.net> To unsubscribe look at the footer of this email. ----------------------------------------------------------- Never mind that last comment. The wood could probably not withstand the freezing. Joel Voron Colonial Williamsburg Foundation Conservation Dept. Integrated Pest Management Office 757-220-7080 Cell 757-634-1175 E-Mail jvo...@cwf.org<mailto:jvo...@cwf.org> ________________________________ From: pestlist-ow...@museumpests.net<mailto:pestlist-ow...@museumpests.net> <pestlist-ow...@museumpests.net<mailto:pestlist-ow...@museumpests.net>> on behalf of Karen Potje <kpo...@cca.qc.ca<mailto:kpo...@cca.qc.ca>> Sent: Wednesday, June 29, 2016 11:49:51 AM To: pestlist@museumpests.net<mailto:pestlist@museumpests.net> Subject: RE: [pestlist] wood-boring beetle This is a message from the Museumpests.net List. To post to this list send it as an email to pestlist@museumpests.net<mailto:pestlist@museumpests.net> To unsubscribe look at the footer of this email. ----------------------------------------------------------- Thank you to those who've given information on this infestation. I have just come across this article about Anobium punctatum http://www.buildingconservation.com/articles/woodworm/woodworm.htm which states: The deposition of quantities of fresh gritty frass from the emergence holes may sometimes indicate active infection. However, frass may often be found coming out of emergence holes in previously affected timbers many years after active infection has ceased. This may be due to vibration caused by heavy traffic on adjacent roads or building works elsewhere on the structure. Again, the appearance of freshly deposited frass around emergence holes has often been the justification for extensive remedial treatments in the past, even when the infection by Anobium punctatum has been dead or inactive for many years. This makes me wonder if, instead of seeing an active infestation, we are seeing frass and dead insects shaken out of the wood during transit from Italy which come from a previous, now infactive infestation. Attached are pictures of the frass. In the picture of the greyish wooden door you see frass at the bottom right (In the second photo I've circled areas of frass in yellow) while the other photo shows frass deposited on the crate itself. I have already made tentative arrangements to have this crate and its contents treated with CO2 next week, but given that the treatment is expensive, should I do further investigation in an attempt to find out if the infestation is active? Or should I just play it safe and have the treatment done ASAP? Of course we don't want to take any risk of an active infestation continuing and of the insects travelling throughout our storage areas. And since these insects have a long life cycle, even if the frass is old, how would I know there are not eggs inside, waiting to hatch and do more damage? Here is what the article says about identifying an active infestation: Searching for live Anobium punctatum larvae within timber is generally destructive, and surprisingly few larvae may actually be found. It is possible to use highly sensitive piezoelectric microphones embedded in the timbers to monitor activity, but this is not yet the basis of an effective diagnostic technique for use in the field. Similarly, it is possible to identify recently produced frass using immunological or genetic techniques. Again, this is not yet the basis of a cost-effective field identification technique. In practical terms, the likelihood of significant Anobium punctatum infection is relatively easy to assess, in that if the deep moisture content of the timber is below 12 per cent, it is too dry for infection and decay to occur, while if the moisture content is between approximately 16 and 30 per cent it is possible, even if infection and decay is not present at the time of investigation. If a deep moisture content of 16-30 per cent is found in the sapwood of vulnerable timber, then an assessment has to be made whether this moisture content is likely to persist for over two years. If this is the case, then appropriate remedial measures should be considered. I'm inclined to go ahead with the treatment but wonder if those with insect expertise would advise further investigation first. Thanks for your advice Karen Potje Chef, Conservation/Restauration Head, Conservation/Preservation Centre Canadien d'Architecture 1920, rue Baile, Montréal, Québec Canada H3H 2S6 514 939 7001 x 1236 www.cca.qc.ca<http://www.cca.qc.ca/> ------------------------------------------------------------- To unsubscribe from this list send an email to imail...@museumpests.net<mailto:imail...@museumpests.net> and in the body put: "unsubscribe pestlist" Any problems email l...@zaks.com<mailto:l...@zaks.com> ------------------------------------------------------------- To unsubscribe from this list send an email to imail...@museumpests.net<mailto:imail...@museumpests.net> and in the body put: "unsubscribe pestlist" Any problems email l...@zaks.com<mailto:l...@zaks.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
