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<div class="moz-cite-prefix">Hi Gali,</div>
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<div class="moz-cite-prefix">hope all is right at your end!</div>
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<div class="moz-cite-prefix">John is right, -40°C can cause quite some damage for some materials because of the shrinkage. -25°C for IPM treatment (maybe for a slightly longer time) shoul dbe perfectly enough to kill pests. There have been some recent papers
on this topic, a colleague of mine was referring to them recently when we were "talking pests". Need to dig them out; there is on Tome Strang wrote a couple of years back, think it is this here:
<a href="https://www.canada.ca/en/conservation-institute/services/conservation-preservation-publications/canadian-conservation-institute-notes/controlling-insects-low-temperature.html">
link</a><br>
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<div class="moz-cite-prefix">In this link of the Canadian Conservation Institute it is recommended not to go deeper than -40°C</div>
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<div class="moz-cite-prefix">The newer article of Tom (2008) is referenced on the museum pest list, and here the recommendation also is probably not going further down than -30°C:
<a href="https://museumpests.net/solutions-low-temperature-treatment/">link</a><br>
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<div class="moz-cite-prefix">Hope this helps</div>
<div class="moz-cite-prefix">Dirk<br>
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<div class="moz-cite-prefix">Am 11.08.2024 um 13:58 schrieb Gali Beiner:</div>
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<div>Dear All, </div>
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<div>I'd like to ask for opinions regarding the choice of a freezer for our herbarium. The herbarium already has a -40C freezer for pest control purposes, but the combination of large quantities of incoming material for freezing with questions regarding additional
possible uses for the freezer raised the question whether a new, additional freezer should be a -40C freezer or a -80C freezer. </div>
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<div>Generally speaking, pest control does not usually require temperatures as low as -80C, but DNA preservation (samples, tissues from non-herbal collections) does. Would you consider keeping a -80C freezer to serve both purposes as need arises? I'm curious
to hear whether other herbaria use -80C freezers or choose higher temperatures. There is of course the question of cost vs actual requirements, and the main requirement right now is for pest control prior to entry into the herbarium. </div>
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<div>A penny for your thoughts, </div>
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<div>Gali</div>
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