This is a message from the Museumpests List. To post to this list send it as an email to [email protected] To unsubscribe please look at the footer of this email. -----------------------------------------------------------
Colin - Please! Tom -----Original Message----- From: colin smith <[email protected]> To: pestlist <[email protected]> Sent: Tue, Mar 13, 2012 8:21 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 [email protected] 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: [email protected] Sent: Tuesday, March 13, 2012 11:28 AM To: [email protected] Subject: Re: [pestlist] Freezer Trucks This is a message from the Museumpests List. To post to this list send it as an email to [email protected] 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 <[email protected]> To: pestlist <[email protected]> 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 [email protected] 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: [email protected] Subject: RE: [pestlist] Freezer Trucks This is a message from the Museumpests List. To post to this list send it as an email to [email protected] 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: [email protected] [mailto:[email protected]?] On Behalf Of [email protected] Sent: Sunday, March 11, 2012 8:39 AM To: [email protected] Subject: Re: [pestlist] Freezer Trucks This is a message from the Museumpests List. To post to this list send it as an email to [email protected] 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 <[email protected]> To: pestlist <[email protected]> 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 [email protected] 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 [email protected] 212-769-5613 voice 212-769-5277 fax The New York Entomological Society, Inc. www.nyentsoc.org [email protected] From: [email protected] [[email protected]] on behalf of Anderson, Gretchen [[email protected]] Sent: Saturday, March 10, 2012 10:20 PM To: [email protected] Subject: RE: [pestlist] Freezer Trucks This is a message from the Museumpests List. To post to this list send it as an email to [email protected] 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: [email protected] [[email protected]] on behalf of [email protected] [[email protected]] Sent: Saturday, March 10, 2012 8:58 PM To: [email protected] Subject: Re: [pestlist] Freezer Trucks This is a message from the Museumpests List. To post to this list send it as an email to [email protected] 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 <[email protected]> To: pestlist <[email protected]> Sent: Sat, Mar 10, 2012 8:41 pm Subject: [pestlist] Freezer Trucks This is a message rom the Museumpests List. To post to this ist send it as an email to [email protected] To unsubscribe lease look at the footer of this email. ----------------------------------------------------------- We recently tried sing a freezer truck to process a large number f boxes of archives. Record boxes were stacked in ows with 12" gaps between the rows to allow for air irculation. We placed a datalogger in the center of ne of the boxes of archive materials (in the enter of the truck) and another outside the boxes to measure he temperature of the air in the truck box. The esults were surprising. We had been nformed that the truck ould go down to -20 degrees F in 4 hours. Our ata loggers showed that it took 10 hours for the air n the truck to go from 44 degrees F to -15 degrees F, and he temperature inside one of the record boxes took ~96 ours to drop from 70 degrees to -15 degrees. (The oxes had been in a 72 degree environment before eing placed in the truck box). It appears hat the starting temperature of the boxes of paper was more ifficult to reduce than I expected. And the ruck never achieved the desired temperature. We are very disappointed in these nitial results and are trying to figure out if there s a different strategy for using a reezer truck, or if this is just not feasible for freezing ensely packed materials, such as paper packed in a ecord box. We are discussing packing boxes half ull and packing the truck to allow for even ore air circulation. But it seems that getting to the oal of -20 degrees F in 4 hours may not be easible. Does anyone have any positive xperiences working with a freezer truck for processing a arge quantity of materials? Especially ense materials such as wood or boxes of aper? Thanks, Dana enge Assistant Conservator National Park ervice Intermountain Region Museum Services rogram Tucson, AZ 85745 520-791-6432 [email protected] ---------------------------------------------------------------------- To send an email to he list, send your msg to [email protected] To unsubscribe from this list send an mail to [email protected] and in the subject put: "unsubscribe" - no uotes please. You are receiving the Pestlist emails n standard mode. 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