Characterization of acaricide resistance in Rhipicephalus microplus populations infesting cattle in northeastern India and assessment of local plant extracts for tick management

Publication date: Available online 5 December 2019Source: Veterinary ParasitologyAuthor(s): Deepak Upadhaya, Bhanu Kumar, Sachin Kumar, Anil Kumar Sharma, Ashutosh Fular, Nisha Bisht, Sharad Srivastava, Rashmi Rekha Boruah, Gaurav Nagar, Mukesh Shakya, Tankeswar Nath, Shoma Paul Nandi, Karivaradharaja S, Srikant GhoshAbstractIn the present study, the tick isolates were collected from Assam state, of northeastern region (NER) and characterized using in vitro bioassay, biochemical and molecular assays. Comparing LC50 value of susceptible IVRI-I and larvae of field isolates, revealed that RF against deltamethrin was highest for Morigaon (MGN = 21.8) and lowest for Sonitpur (SNP = 3.3) isolate. The RF against cypermethrin was highest for Nagaon (NGO = 5.0) and lowest for Barpeta (BPT = 1.2) isolate. Against coumaphos, the highest RF of 4.5 was calculated for BPT (4.5) and lowest for NGO (1.3) isolate. While using adults based assay, highest RF of 24.68 against deltamethrin and lowest RF of 4.96 was determined for MGN and SNP isolate, respectively. In contrast to the results obtained using larvae, against cypermethrin, highest RF was recorded for Kamrup Metropolitan (KMP) while it was NGO isolate using larvae. In case of coumaphos, both larvae and adults of BPT isolate were also highly resistant and lowest RF was detected in SNP (2.30) isolate. All the isolates were susceptible to ivermectin. A significant correlation (p < 0.01) between deltamethrin resista...
Source: Veterinary Parasitology - Category: Veterinary Research Source Type: research