[Nhcoll-l] Decontamination of herbarium specimens by freezing

[Hawks, Catharine]

Please see attached. If specimens are properly packaged before freezing, this process will do no harm and will eliminate all life stages of pest insects.

Cathy
_______________________________
Catharine Hawks
Conservator
Collections Program
MRC 170 Rm M85-J
National Museum of Natural History
10th Street & Constitution Ave NW
Washington DC 20560
w 202.633.0835 or 4041  c 703 200 4370
hawksc at si.edu<mailto:hawksc at si.edu>

SMITHSONIAN INSTITUTION
NATIONAL MUSEUM OF NATURAL HISTORY
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From: Nhcoll-l <nhcoll-l-bounces at mailman.yale.edu> On Behalf Of Roxali Bijmoer
Sent: Monday, April 30, 2018 10:59 AM
To: nhcoll-l at mailman.yale.edu
Subject: [Nhcoll-l] Decontamination of herbarium specimens by freezing

Dear all,

We're working on new collection protocols, trying to write everything down and see if all is up to date. One of the topics is the decontamination by freezing of herbarium specimens.

We are familiar with the herbarium handbook, but do any of you know about recent research on this matter? We decontaminate our herbarium specimens for 72 hours at -30 Celsius. I'm finding varying policies on decontaminating herbarium specimens. From at least 48 hours at -18 to 14 days at -40. Is there a bare minimum of hours that specimens need to be frozen and is freezing at colder temperatures more damaging to the specimens?

Thanks for you help,


Roxali Bijmoer
Collections Manager Herbarium

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