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Resistance to Cypermethrin Is Widespread in Cattle Ticks (Rhipicephalus microplus) in the Province of Punjab, Pakistan: In Vitro Diagnosis of Acaricide Resistance
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Resistance to Cypermethrin Is Widespread in Cattle Ticks (Rhipicephalus microplus) in the Province of Punjab, Pakistan: In Vitro Diagnosis of Acaricide Resistance
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Resistance to Cypermethrin Is Widespread in Cattle Ticks (Rhipicephalus microplus) in the Province of Punjab, Pakistan: In Vitro Diagnosis of Acaricide Resistance
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Journal Article
Resistance to Cypermethrin Is Widespread in Cattle Ticks (Rhipicephalus microplus) in the Province of Punjab, Pakistan: In Vitro Diagnosis of Acaricide Resistance
2022
Overview
Control of the cattle tick Rhipicephalus (R.) microplus mainly relies on chemical acaricides and cypermethrin is the most widely used acaricide in Pakistan. Farmers frequently complain about its low efficacy, thus, the present study was designed to quantify the frequency of cypermethrin resistance in cattle ticks. Engorged female R. microplus were collected and tested for the efficacy of cypermethrin using the FAO-recommended larval packet test. Resistance factors (RF) were estimated at both the lethal concentration for 50% (LC50) and 99% (LC99) of ticks. Thirty-three samples were tested, of which 8/33 (24.24%) were classified as resistant based on the RF50, and all 33 were classified as resistant based on the RF99. In District Sargodha, when only the RF50 was considered, 45.5% of samples were classified as resistant, but at RF99, all tested samples were identified as resistant. In District Okara, the variation in RF50 estimates was 2.2–8.3 and variation in RF99 estimates was 10.6–1139.8. Similar results were found in District Attock, where variations in RF50 were 0.8–8.5 and RF99 ranged from 9–237.3. The study showed that cypermethrin resistance is prevalent in these three districts of Pakistan and is likely to be overestimated by classification based on the RF99.
Publisher
MDPI AG,MDPI
Subject
