Common tansy

Common tansy (Tanacetum vulgare L.) is a perennial flowering plant widely recognized in sustainable agriculture for its potent bio-insecticidal properties. The primary active compounds include essential oils (such as thujone and camphor), flavonoids, and sesquiterpene lactones concentrated in the leaves and flowers.

In terms of crop protection, preparations derived from Tanacetum vulgare function primarily as botanical insecticides and powerful repellents. They serve as a viable alternative for organic farmers looking to mitigate pest pressure without resorting to systemic synthetic chemicals that can harm beneficial insect populations.

The mechanism of action is multifaceted. The volatile organic compounds emitted by the extract interfere with the chemoreceptors of pests, effectively masking the scent of the host crop and deterring oviposition. Furthermore, the compounds exhibit contact toxicity towards soft-bodied insects, disrupting their metabolic functions and inhibiting the development of juvenile stages.

Tansy-based treatments are typically applied to horticultural crops, including potatoes, brassicas, and fruit trees, to combat a range of pests such as aphids, spider mites, and various lepidopteran larvae. Due to the rapid degradation of organic compounds, multiple applications are often required to maintain an effective barrier against recurring pest infestations throughout the growing season.

When handling Tanacetum vulgare extracts, growers must exercise caution due to the presence of thujone, which is neurotoxic if ingested or absorbed in large amounts. Protective gear, including gloves and masks, is recommended during the preparation of concentrated sprays, and users should always strictly adhere to pre-harvest intervals to ensure the safety of the final produce.