Variation of diazinon and amitraz susceptibility of Hyalomma marginatum (Acari: Ixodidae) in the Rabat-Sale-Kenitra region of Morocco

Latifa Elhachimi, Thomas Van Leeuwen, Wannes Dermauw, Carolien Rogiers, Félix Valcárcel, Angeles Sonia Olmeda, Sarah Elhamiani Khatat, Sylvie Daminet, Hamid Sahibi, Luc Duchateau

    Onderzoeksoutput: Bijdrage aan tijdschriftArtikelpeer review


    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.

    Oorspronkelijke taalEngels
    TijdschriftTicks and tick-borne diseases
    Pagina's (van-tot)101883
    PublicatiestatusGepubliceerd - mrt-2022

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