This is a message from the Museumpests 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. ----------------------------------------------------------- I was thinking more of the visitors. As I am sure you know, bed bugs do not just feed off humans, they will feed on any warm blooded animal. If you have rodents or birds living or nesting in close proximity to the building there is a risk, I agree a small one, that an infestation can become established.
Colin From: bugma...@aol.com Sent: Tuesday, March 13, 2012 11:28 AM To: pestlist@museumpests.net Subject: Re: [pestlist] Freezer Trucks This is a message from the Museumpests 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, stop the bed bug controversy. They are NOT a threat to collections. Has anyone ever had bed bugs in their collections, either in-house or incoming? The possibility is extremely remote. Tom Parker -----Original Message----- From: colin smith <inhol...@btinternet.com> To: pestlist <pestlist@museumpests.net> Sent: Tue, Mar 13, 2012 5:58 am Subject: Re: [pestlist] Freezer Trucks This is a message from the Museumpests 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. ----------------------------------------------------------- Interestingly, Cimex are more susceptible to a anoxia than some other insects. I have good data which shows all stages are controlled in 7 days at 0.2% oxygen, which may be acceptable when compared with the risks of deep freezing. Colin Smith From: Louis Sorkin Sent: Monday, March 12, 2012 2:24 PM To: pestlist@museumpests.net Subject: RE: [pestlist] Freezer Trucks This is a message from the Museumpests 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. ----------------------------------------------------------- Think again. Cimex is a very different creature. Bed Bug Research at U MN For freezing, a minimum of 23°F (-5°C) must be maintained for at least 5 days. As the temperature is decreased, the time of exposure is shortened. For instance, the articles could be “flash frozen,” resulting in a very short time of exposure, but the target temperature should be -15°F (-26°C), the conditions required to instantly freeze the eggs. Keep in mind that most household freezers will have varying temperatures between 30°F and 20°F, and a 2-week freeze time is recommended if you are uncertain of the freezer temperatures. The temperature of your freezer is very important. The lower the temperature, the less time needed to kill bed bugs. Freezers set to 0°F are effective in killing bed bugs, but items must be left in the freezer for at least 4 days. If you are concerned about ensuring that temperatures are low enough, purchase an indoor/outdoor thermometer and monitor the temperature inside the items you are freezing. 0°F must be reached in the center of the materials being frozen to kill bed bugs. Bulky items require more time. Start counting the 4 day exposure time when the center of the object has reached 0°F. Do not use temperatures above 5F (-15°C) as eggs and small bed bugs may survive. From: ad...@museumpests.net [mailto:ad...@museumpests.net?] On Behalf Of bugma...@aol.com Sent: Sunday, March 11, 2012 8:39 AM To: pestlist@museumpests.net Subject: Re: [pestlist] Freezer Trucks This is a message from the Museumpests 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. ----------------------------------------------------------- Lou - It is true about bed bugs; they're tough critters. However, there's no way they are going to survive 72 hours at -20 F or -15 F, or even 0 F. Tom -----Original Message----- From: Louis Sorkin <sor...@amnh.org> To: pestlist <pestlist@museumpests.net> Sent: Sat, Mar 10, 2012 11:11 pm Subject: RE: [pestlist] Freezer Trucks This is a message from the Museumpests 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. ----------------------------------------------------------- If you happen to have bed bugs (funny I should mention them!) in boxes (I've seen office records with bed bugs from clients, workers, other people's homes), taking it down to 32F is no where near sufficient. In fact, taking it down to -30F for a few hours doesn't kill them either; they just warm up and wake up after bringing the material back to room temp. Louis N. Sorkin, B.C.E. Entomologist, Arachnologist Division of Invertebrate Zoology American Museum of Natural History Central Park West at 79th Street New York, New York 10024-5192 sor...@amnh.org 212-769-5613 voice 212-769-5277 fax The New York Entomological Society, Inc. www.nyentsoc.org n...@amnh.org -------------------------------------------------------------------------------- From: ad...@museumpests.net [ad...@museumpests.net] on behalf of Anderson, Gretchen [anders...@carnegiemnh.org] Sent: Saturday, March 10, 2012 10:20 PM To: pestlist@museumpests.net Subject: RE: [pestlist] Freezer Trucks This is a message from the Museumpests 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. ----------------------------------------------------------- Dana - In addition you need to realize that boxes of archives are very dense - and that paper is very good insulator. In fact, shredded paper is used to insulate houses in northern climates. Given that, it is not surprising that it took time to reach the the desired temperature. Be patient - the method works. Gretchen Anderson Conservator Carnegie Museum of Natural History -------------------------------------------------------------------------------- From: ad...@museumpests.net [ad...@museumpests.net] on behalf of bugma...@aol.com [bugma...@aol.com] Sent: Saturday, March 10, 2012 8:58 PM To: pestlist@museumpests.net Subject: Re: [pestlist] Freezer Trucks This is a message from the Museumpests 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. ----------------------------------------------------------- Dana - First of all, the temperature does not have to reach -20F in 4 hours. It should reach 32F in 4 hours. That's sufficient. The reason you use a truck capable of maintaining -20F, is it will reach the desired 32F in 4 hours. Once the liquid in adults, larvae, and eggs reaches a freezing temperature, ice particles form and destroy the cellular structure of the living organisms. Unless you're dealing with "book worms", which I doubt you are with archival records, any insects found in these materials will certainly be killed. When freezing anything, you're trying to beat insects from forming natural defenses to freezing. I think your process worked fine. Have you found any live insects? I have had plenty of sucessful freezing episodes with freezer trucks, containers, and warehouses. Tom Parker -----Original Message----- From: dana senge <dkse...@gmail.com> To: pestlist <pestlist@museumpests.net> Sent: Sat, Mar 10, 2012 8:41 pm Subject: [pestlist] Freezer Trucks This is a message from the Museumpests List.To post to this list send it as an email to pestlist@museumpests.netTo unsubscribe please look at the footer of this email.-----------------------------------------------------------We recently tried using a freezer truck to process a large number ofboxes of archives. Record boxes were stacked in rows with 12" gapsbetween the rows to allow for air circulation. We placed a dataloggerin the center of one of the boxes of archive materials (in the centerof the truck) and another outside the boxes to measure the temperatureof the air in the truck box. The results were surprising. We had been informed that the truck would go down to -20 degrees F in4 hours. Our data loggers showed that it took 10 hours for the air inthe truck to go from 44 degrees F to -15 degrees F, and thetemperature inside one of the record boxes took ~96 hours to drop from70 degrees to -15 degrees. (The boxes had been in a 72 degreeenvironment before being placed in the truck box). It appears thatthe starting temperature of the boxes of paper was more difficult toreduce than I expected. And the truck never achieved the desiredtemperature. We are very disappointed in these initial results and are trying tofigure out if there is a different strategy for using a freezertruck, or if this is just not feasible for freezing densely packedmaterials, such as paper packed in a record box. We are discussingpacking boxes half full and packing the truck to allow for even moreair circulation. But it seems that getting to the goal of -20 degreesF in 4 hours may not be feasible. Does anyone have any positive experiences working with a freezer truckfor processing a large quantity of materials? Especially densematerials such as wood or boxes of paper? Thanks, Dana SengeAssistant ConservatorNational Park ServiceIntermountain Region Museum Services ProgramTucson, AZ 5745520-791-6432dana_se...@nps.gov ----------------------------------------------------------------------To send an email to the list, send your msg to pestlist@museumpests.Net To unsubscribe from this list send an email to pestlist@museumpests.net and in the subject put:"unsubscribe" - no quotes please. 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