Is there a trace of bug in your cup of tea?

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German researchers have identified over a thousand species of insects, spiders, mites and other bugs, from the DNA they leave behind in your cup of tea. Using a new DNA analysis method they looked at dried teas and dried herbs found in supermarkets - chamomile, mint, tea and parsley. Among the species they found were some that are known agricultural pests. The authors say this method could be used to trace the origin of illegal plant material confiscated by customs, detect agricultural pests, and monitor bug diversi-tea.

Journal/conference: Biology Letters

Link to research (DOI): 10.1098/rsbl.2022.0091

Organisation/s: Trier University, Germany

Funder: This study was supported by departmental funds of the Department of Biogeography at Trier University.

Media release

From: The Royal Society

The bug in a teacup – Monitoring arthropod-plant associations with environmental DNA from dried plant material

Biology Letters

Every organism leaves traces of its DNA in its environment, so-called environmental or eDNA. eDNA can be enriched and sequenced, allowing researchers to characterize biological communities without the need for collecting actual specimens. Here, we introduce a novel approach to recover eDNA of arthropods from dried plant material. From various commercially produced teas and herbs, we recovered diverse arthropod communities totaling over a thousand species. Atypically for eDNA, arthropod DNA in dried plants shows a very high temporal stability, greatly simplifying the monitoring of arthropod communities.

Contact: Dr Henrik Krehenwinkel, Trier University, krehenwinkel@uni-trier.de,

URL after publication: https://royalsocietypublishing.org/doi/10.1098/rsbl.2022.0091

  • Bug diversi-tea - What can a cup of tea tell us about bug biodiversity? Using a new DNA analysis method, researchers gathered arthropod environmental DNA from dried teas and dried herbs found in supermarkets - chamomile, mint, tea and parsley. They identified over a thousand diverse arthropod species. This technique could be used to trace the origin of illegal plant material confiscated by customs, detect agricultural pests, and monitor arthropods and arthropod– plant interactions.

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