To avoid introducing pests, quarantine and treat all newly acquired Haworthias before bringing them into the collection. For a new plant, clean as much of the growing medium out of the roots and completely discard it. Some roots may be torn off but the plant will be fine. Soaking the plant in a potassium fatty acids solution and then a hydrogen peroxide soaking, and rinse it after each soaking. This kills any pests and fungus. Let the plant dry out in a shady and cool place before planting it in a fresh growing medium, and prioritize the application of Imidacloprid in next waterings.
After potting, wait for ~1 week before the first watering so that any small wounds on the roots will heal. Keep the plant in a shady place for the next ~2 weeks. This helps the plant establish roots in growing medium because a strong sunlight moves auxins to the top part of the plant and can inhibit root growth.