In the 1990s, the Bee Research Centre took part in a screening programme testing the potential effectiveness of over 100 essential oils and essential oil components against the varroa mite. Although sage, hyssop and thyme oils proved interesting, only thymol has been used in acaricide products. Thymol treatments require little effort, and there are a variety of preparations on the market. The advantages and drawbacks of thymol use are listed in the articles "Apilife VAR: A new varroacide with thymol as the main ingredient" and "THYMOVAR for Varroa control".

Use of essential oils for the control of Varroa jacobsoni (Oud.) in honey bee colonies (PDF, 1 MB, 20.01.2017)
A. Imdorf, S. Bogdanov, R. Ibáñez Ochoa, N. W. Calderone (1999)

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Pubblicazioni Dieter Weik

Schwendimann L., Jakob E., Weik D., Graber H. U., Bachmann H.-P., Berger T.
Effects of scalding temperature on the growth of Staphylococcus aureus and the formation of enterotoxins in the production of alpine hard cheese.
In: International Scientific Conference on Raw Milk. 24 October, Valencia, Spain. 2019, 1.

Hummerjohann J., Weik D., Ulmann B., Imhof R.
Detection Of Listeria Monocytogenes In Cheese And Samples Of The Production Environment: Comparison Of The One-Step Enrichment Broth “OneBroth (TM)” With The Reference Method ISO 11290-1.
In: SGM-Tagung und Foodmicro-Symposium. 12.-13. Juni 2008 und 1.-4. September 2008, Ed. ALP, Interlaken und Aberdeen (UK). 2008, 1-1.

Hummerjohann, J., Imhof, R., Mühlemann, M., Weik, D., Ulmann-Christen, B., Schällibaum, M.
LISTERIA IN SWISS CHEESES AND DAIRIES: RESULTS OF LISTERIA MONITORING PROGRAMME 2003 (Poster).
64. Jahresversammlung der schweiz. Ges. für Mikrobiologie, Genf, 31.3.-1.4.2005, 2005, 1-1.

Weik, D., Kaufmann U.
Campylobacter jejuni in Rohmilch.
Schweizerische Milchwirtschaftliche Forschung, 20, 1991, 30-32.

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Apilife VAR: A new varroacide with thymol as the main ingredient (PDF, 103 kB, 20.01.2017)
A. Imdorf, S. Bogdanov, V. Kilchenmann, C. Maquelin (1994)

"THYMOVAR" for Varroa control (PDF, 75 kB, 27.01.2017)
F. Bollhalder (1998)

Although the use of thymol leads to residues in the wax and honey, these are negligible from a toxicological viewpoint. Since about 2008 the use of thymol-based products has been declining in Switzerland, and beekeepers making use of these products have tended to experience greater winter losses than those using e.g. formic acid.

Thymol residues in wax and honey after Apilife VAR treatment (PDF, 757 kB, 14.09.2016)
S. Bogdanov, A. Imdorf, V. Kilchenmann (1998)

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Pubblicazioni Dieter Weik