As one of the possible solutions for keeping Asian long-horned ticks (H. longicornis) trapped around CO2 reservoirs, I conducted lab observations using vegetable oil. It appears that once H. longicornis is in oil, they lose leg traction and cannot swim through or out of oil easily. However, the problem was getting the ticks to walk or fall in the oil, on their own. They seem to sense the presence of oil and avoid it or crawl around it.