Living With Turmeric

Eastern Subterranean Termite

Reticulitermes flavipes, Eastern Subterranean Termite

Chemicals in spices are often noted for deleterious effects on insects. However, these natural chemicals rarely are deployed as commercial insecticides. The insecticidal chemicals in spices are often at low doses making extraction impractical. Many have complex structures that are difficult and expensive to make synthetically. They often degrade too rapidly for long term effect. They may have deleterious effects on beneficial insects or be toxic to plants. The greatest utility of insecticidal plant chemicals is to serve as models for chemists. Chemists can make modifications of a chemical structure to produce new synthetics with more desirable properties such as better efficacy, low environmental impact, appropriate selectivity and minimal adverse human health effects. Many of our modern synthetic insecticides are based on plant toxins.

Turmeric, a spice noted for insecticidal properties has been studied for its toxicity to termites and the insecticidal chemicals elucidated. The toxins are turmerone and curlone which are responsible for the flavoring properties. The mode of action is unknown. Will these lead to new types of commercial insecticides? The odds are against it and it typically requires a decade or longer to go from initial characterization to practical application.

Kapil R. Raje, Gabriel P. Hughes, Ameya D. Gondhalekar, Matthew D. Ginzel, Michael E. Scharf. 2015. Toxicity of Turmeric Extracts to the Termite Reticulitermes flavipes. Journal of Economic Entomology
DOI: http://dx.doi.org/10.1093/jee/tov109

About jjneal

Jonathan Neal is an Associate Professor of Entomology at Purdue University and author of the textbook, Living With Insects (2010). This blog is a forum to communicate about the intersection of insects with people and policy. This is a personal blog. The opinions and materials posted here are those of the author and are in no way connected with those of my employer.
This entry was posted in by jjneal, Environment, Pest Management. Bookmark the permalink.

2 Responses to Living With Turmeric

  1. Pingback: Living With Turmeric | Entomo Planet

  2. GarryRogers says:

    Reblogged this on GarryRogers Nature Conservation and Science Fiction (#EcoSciFi) and commented:
    As pointed out in the article, “Many [natural chemicals] have complex structures that are difficult and expensive to make synthetically.

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