Alexandra, Your question is clear and direct. The answer, however, must rely upon the less direct comment: ‘It depends’. The threshold for action should be based upon the acceptable level of risk.
If one silverfish was discovered near the Magna Carta, that would likely lead to immediate and aggressive efforts to investigate, abate the problem, and ensure that preventative measures were put into action. That same silverfish in the loading dock of warehouse, however, would be relatively insignificant. The abundance of any pest should be considered along with the frequency of trap monitoring. One silverfish captured in the archives after just a day of monitoring may be far more concerning than 10 silverfish captured during an interval of six months. In summary, consider what is an acceptable level of risk, then set goals that are worthwhile, attainable, sustainable, and measurable. -Rich Richard J. Pollack, PhD HARVARD UNIVERSITY Environmental Health and Safety (EH&S) Senior Environmental Public Health Officer 46 Blackstone St. Cambridge, MA 02139 Office: 617-495-2995 Cell: 617-447-0763 www.ehs.harvard.edu richard_poll...@harvard.edu<mailto:richard_poll...@harvard.edu> linkedin.com/in/richard-pollack-6818997<https://www.linkedin.com/in/richard-pollack-6818997> From: 'Wade, Alexandra' via MuseumPests <pestlist@googlegroups.com> Date: Wednesday, June 15, 2022 at 9:14 AM To: pestlist@googlegroups.com <pestlist@googlegroups.com> Subject: [PestList] Monitoring figures Good afternoon list, I hope you’re all well. I am currently writing an IPM instructions document for our institution. One of the questions that often comes up is at what point do you have enough pests to qualify for interventive treatment? Whilst attempting to get to zero pests is lovely I’m not sure that’s something that can be realistically achieved in most institutions. So, if for example you have a catch of silverfish in one of your traps, how many would one catch before saying you have too many and need to put down some pesticide? 5/10/20? Considering the blunder traps are only a small representation of floor space in the store if you have say 10 silverfish in the traps I assume that the amount of silverfish in the store overall is much greater. Does anyone have a hard cut off line for what is a reasonable amount of pest activity or a “manageable” amount? Or if you just have some thoughts on the topic that would be great! Thank you so much, Alexandra Wade Assistant Conservator London Metropolitan Archives Town Clerk’s Department City of London Tel: 020 7332 3820 www.cityoflondon.gov.uk/lma<https://urldefense.proofpoint.com/v2/url?u=https-3A__gbr01.safelinks.protection.outlook.com_-3Furl-3Dhttps-253A-252F-252Fwww.cityoflondon.gov.uk-252Fthings-2Dto-2Ddo-252Fhistory-2Dand-2Dheritage-252Flondon-2Dmetropolitan-2Darchives-253Futm-5Fsource-253Dlma-2526utm-5Fmedium-253Demail-2526utm-5Fcampaign-253Dsignature-26data-3D04-257C01-257CAlexandra.Wade-2540cityoflondon.gov.uk-257C1272013fe63b4d8a930808da1bd8e615-257C9fe658cdb3cd405685193222ffa96be8-257C0-257C0-257C637852915625781276-257CUnknown-257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0-253D-257C3000-26sdata-3D-252BJGAn4ROpCZ0m0dlZNDki7NP8cAds52cvLwZZ-252FFBnlo-253D-26reserved-3D0&d=DwMFaQ&c=WO-RGvefibhHBZq3fL85hQ&r=GO7C3XN3WgFy2IP-bFBbnUs_CYntqj57Dprtl40-_KE&m=1APJQ6DHy4Z0j2k7wowxXrVKAHuYn02G5Mm-TgiIAuYaKUznvyT9vkk_lgP1J_l9&s=n_sRKIjHb-y-AcMAM-cBOazYXaf43wqS4w3PHCMNjy4&e=> London Metropolitan Archives is open Monday to Thursday, 10am-4pm (including our exhibition: Magnificent Maps of London). 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