Journal
TICKS AND TICK-BORNE DISEASES
Volume 13, Issue 2, Pages -Publisher
ELSEVIER GMBH
DOI: 10.1016/j.ttbdis.2021.101883
Keywords
Susceptibility status; Diazinon and amitraz; Larval packet test; Hyalomma marginatum; Cattle; Morocco
Categories
Funding
- Flemish Interuniversity Council-University Development Cooperation
- Flemish Interuniversity Council-Directorate General for Development
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In this study, the acaricide susceptibility of Hyalomma marginatum in the Rabat-Sale-Kenitra region of Morocco was investigated. The results showed varying levels of susceptibility to diazinon and amitraz, and emerging resistance to acaricides in ticks.
In the present study, the acaricide susceptibility status of Hyalomma marginatum in Morocco was investigated in the Rabat-Sale-Kenitra region using the Larval Packet Test. The overall LC50 value for diazinon and amitraz was 115 ppm (95% CI: [104; 125]) and 22 ppm (95% CI: [21; 23]), respectively. The LC50 values varied significantly between the nine sampled locations (P<0.001) ranging from 75 ppm (95% CI: [65; 84]) in Ouelmes to 179 ppm (95% CI: [139; 201]) in Jorf El Melha for diazinon and from 18 ppm (95% CI: [15; 21]) in Skhirat to 28 ppm (95% CI: [24; 31]) in Ouelmes for amitraz. Sequencing of the target-site of diazinon, acetylcholinesterase 1 (AChE1), indicated that previously reported resistance mutations in AChE1 were absent in ticks from Jorf El Melha surviving 500 ppm diazinon. This study is the first report on the H. marginatum susceptibilty status to the most frequently used acaricides in Morocco and indicates that acaricide tick resistance is emerging.
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