Hello Suzan, 

Please for molecular detection, you must mention the species or genus to select the specific gene.

you can read this article about related subject 

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4644327/

Best regards 

Thank you very much

I have attached a protocol have used before to extract genomic DNA from ticks. it gives good quality DNA. For a specific gene, you need to design primers from the flanking region of the gene, which could be conserved across species. Which gene are you targeting? Included in the attached document is a PCR protocol for amplification of cytochrome c oxidase gene which is relatively conserved in a range of genera of ticks, so the primers are almost universal. 

Thank you Esther

To extract  DNA from ticks or mites, you have to go for one of the known protocols and you can find them on the internet or if you can use one of those commercially available kits from the market..

If u have any other question, please feel free to ask.

Regards..