Thymol

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)

Tracing Tilletia caries in wheat during the endophytic phase.

Institutional Repository Agroscope

Mascher-Frutschi F., Litzistorf, C., Kellenberger S., Schori A.

Tracing Tilletia caries in wheat during the endophytic phase.

Dans: XX International Workshop on Smuts Bunts. 29th May - 1st June, Ed. Utah State University, Logan, Utah, USA. 2018, 11.

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Résumé:

Common bunt of wheat is an important disease caused by infections with Tilletia caries. Besides yield losses, the pathogen spoils the harvest produce with a most disagreeable odour rendering it unsuitable for consumption or for use as seed. The causal agent is a basidiomycete that infects the seedling at the very first moments after germination. After successful infection, the fungus grows endophytically, remaining undetected until the first maturity stages. At that moment, packs of fungal teliospores form in place of kernels, in the spikes. The disease can be avoided by the use of healthy seeds or the use of chemical, physical or certain biological seed dressings. Modern agriculture requires also more sustainable control methods that avoid additional costs. In this context, the use of plant resistance is gaining increasing interest. A series of resistance genes and resistance Qtls have been described. Several studies show that these genes do not necessarily confer total resistance and combinations of genes might provide higher resistance degrees. Yet, only little is known when plant resistance genes intervene in the disease cycle. The present project aims at tracing the fungus in the plant after infection in susceptible and resistant plants. Results and conclusions will be presented.

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Début de la page

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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Thymol

Tracing Tilletia caries in wheat during the endophytic phase.