A WDI Inspection is a thorough examination of a property to determine if there are visible signs of wood-destroying insects. During the WDI Inspection, a pest control technician will also look for signs that a property has previously been treated and whether the treatment is ongoing. it’s important to know that serious issues can occur from wood-destroying insects. Termites, carpenter ants, carpenter bees, powderpost beetles, and other wood-destroying insects lurk beneath the surface of wood and commonly go unnoticed until they’ve caused substantial damage.