author(s)
Surbhi, Snehil Gupta, Arun K Sangwan and Nirmal Sangwan

abstract
A Gaushala at Madhogarh village of Mahendergarh district in Haryana was found heavily infested with Ornithodoros savignyi. Laboratory standardized adult immersion test was employed for efficacy trials at different concentration of deltamethrin following 10-minute protocol and 14 days as observation period. The ticks were adjudged dead on the basis of their immobility. Probit analysis of the data generated showed LC₅₀ and LC₉₅ values to be 60.95 ppm and 370.68 ppm, respectively. In addition, the ticks were also employed to adult immersion test with discriminating dose (AIT-DD). Results of the test revealed 86.67%, 60% and 86.67% survivability against cypermethrin, amitraz and fipronil, respectively at the country specific discriminating dose suggested for Rhipicephalus (Boophilus) microplus indicating a need for the separate discriminating dose for Ornithodoros ticks.