In vitro efficacy of commercial preparation of Amitraz in Rhipicephalus (Boophilus) microplus ticks in north Gujarat, India

In vitro efficacy of commercial preparation of Amitraz in Rhipicephalus (Boophilus) microplus ticks in north Gujarat, India

Title: In vitro efficacy of commercial preparation of Amitraz in Rhipicephalus (Boophilus) microplus ticks in north Gujarat, India

Authors: Neelu Sharma, Veer Singh and KP Shyma

Source: Ruminant Science (2016)-5(1):33-37.

Cite this reference as: Sharma Neelu, Singh Veer and Shyma KP (2016). In vitro efficacy of commercial preparation of Amitraz in Rhipicephalus (Boophilus) microplus ticks in north Gujarat, India. Ruminant Science 5(1):33-37.


Rhipicephalus (Boophilus) microplus ticks are the most prevalent one host tick species present in India and is responsible for severe economic loses to dairy and leather industry by adversely affecting milk production and quality of hides. Chemical control by acaricide has resulted in development of resistance in ticks and hence ticks are difficult to control. A study was conducted to assess the efficacy of commercial preparation of Amitraz in R. (B.) microplus ticks of North Gujarat by two step stratified random sampling procedure from areas having complain of treatment failure by using Amitraz. Larval packet test (LPT) was conducted using field strain for determination of 50 and 95% lethal concentration of Amitraz. Results obtained from the test showed inefficacy of Amitraz in tick isolates from Vasda (LC 50 -487.79; LC – 4497.18) and Rooppura (LC50- 5176.41; LC95 – 154471.7) which are much higher than the market recommended dose rate. The data on field status of acaricide resistance from the area with diversified animal genetic resources will be helpful to adopt suitable strategy to overcome the process of development of resistance in ticks.


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