In vitro assessment of Ethanolic extracts from specific herbs on controlling aquatic leech (Tyrannobdella rex) and land leech (Philobdella sp.) infestation in Mithun (Bos frontalis).

ABSTRACT

Leech infestation poses a significant threat to Mithun (Bos frontalis) in the north-eastern region of India, leading to various health issues and potential fatality. To address this pressing concern, we conducted a comprehensive research study aimed at assessing the efficacy of herbal plant extracts against aquatic leeches, particularly Tyrannobdella rex, and land leeches of the Philobdella sp. Our investigation involved the evaluation of six distinct plant extracts, with a focus on their ability to combat leech infestation. The results of our study revealed that among the various plant extracts tested, only the ethanolic extracts of soapnut (Sapindus mukorossi) and tobacco (Nicotiana tabacum) exhibited notable effectiveness in combating aquatic leeches. At a concentration of 5%, these extracts displayed significant lethality, with soapnut extract achieving a remarkable kill time of 6.0 ± 0.40 min, while tobacco extract showed a kill time of 31.5 ± 1.32 min. In the case of land leeches, tobacco extract proved to be highly efficient, with an average kill time of 1.5 ± 0.28 min at a 5% concentration. Soapnut extract also exhibited effectiveness against land leeches, albeit with a slightly longer kill time of 14.25 ± 1.10 min at the same concentration. Additionally, Litsea grass oil (Litsea cubeba) demonstrated promising efficacy against both aquatic and land leeches, suggesting its potential as a versatile leech control agent. These compelling findings have significant implications for the management and control of leech infestation among Mithun populations. By identifying and harnessing the leech-repelling properties of soapnut, tobacco, and Litsea grass oil, this research offers practical and environmentally friendly solutions for mitigating the adverse effects of leech infestation. Furthermore, the insights gained from this study pave the way for the development of innovative strategies to safeguard the health and well-being of Mithun in the future.