[ethersteeds]

This site [1] appears to have a good overview.

There's several common beneficial nematode species, selection is based on factors such as their affinity for your intended pest, "cruising depth" in soil, and the current soil temperature.

I see several sources specifically recommending a mix of the Steinernema feltiae (Sf) and Heterorhabditis bacteriophora (Hb) beneficial nematode species for tick control applications. Live organisms are shipped with ice packs and typically must be kept refrigerated and applied within a 1 month window.

Application is typically performed with a garden hose and a mixing applicator attachment. Nematodes are sensitive to sunlight, application is typically best performed in the evening to allow them time get underground.

One US vendor in this space I'm familiar with (no affiliation) is Nature's Good Guys. Their product recommendations for tick control are here[2]; they offer applicators as well.

[1] https://progardenreview.com/nematodes-for-tick-control/

[2] https://www.naturesgoodguys.com/collections/tick-control