Detection dogs hunting for poisonous plants in arable fields

Dogs, as reliable partners for humans, are increasingly used as species detection dogs in nature conservation or for searching for invasive species. Thanks to their extraordinary sense of smell, trained sniffer dogs are able to detect even the slightest traces of odor molecules such as volatile organic substances from plants. In this project, we use this ability to search for native and invasive poisonous plants with pyrrolizidine alkaloids (PAs) in herb and spice fields. Regular consumption of PAs can be carcinogenic even in relatively small quantities and, in higher doses, can lead to irreversible liver damage. Even extremely low levels of contamination with PAs from poisonous plants can mean that herbs or spices are no longer allowed to be sold in the EU according to updated EU PA limits for those products. Despite the most careful control, contamination with PAs can occur. In addition to native PA poisonous plants such as common groundsel (Senecio vulgaris), there are also invasive species such as the eastern groundsel (S. vernalis) or the narrow-leaved ragwort (S. inaequidens), which have been introduced from Eastern Europe and Southern Africa, respectively. The changed environmental conditions caused by climate change could mean that these invasive species can increasingly establish themselves in arable crops and could thereby endanger food security. Experienced search dogs are trained to detect these poisonous plants using fresh and dried plant material at different stages of development from multiple origins. At the same time, the volatile organic compounds of these samples are also analyzed in order to be able to estimate how the content and composition of essential oils influences the detection success. In the second year of the project, searches will be carried out in different herb and spice fields in order to determine whether specially trained poisonous plant detection dogs are more efficient in searching for Senecio species than human experts and which environmental factors have the greatest influence on precision, sensitivity and efficiency. The use of detection dogs represents a particularly innovative approach to detect potential poisonous plants as early as possible in order to reduce the use of manpower and the use of weed control measures.