Specialized Inspection Techniques

• Night inspections. Sometimes the quickest method for gathering information about the size, extent and activity areas of an infestation can be attained by conducting an inspection at night or during the rodents’ peak activity period (at dusk, just after dark, or shortly after human activities cease for the day). Night inspections can quickly reveal to you the rodent zones (feeding, nesting and "hanging out" areas).

Not only are night inspections informative, but in cases of heavy infestation, they also can be a lot of fun. One is apt to see many rodent interactions (chases, mating, fighting, feeding, etc.), and hear many of the different sounds (high-itched squeals, chattering, etc.) of the rodents that are not available to you during the daytime when the rodents are resting in their nests.

• Tracking patches. Tracking patches placed in suspected rodent zones may confirm the presence of rodents. Tracking patches can be made by spreading talc or some other fine powder along wall areas, objects, near holes, suspected activity areas, etc. the powder should be no more than about 1/8-inch deep. Patches can be inspected the next day for track marks.

By studying these rodent tracks you can determine if the problem is rats or mice. You may also be able to locate trails leading to feeding and nesting areas. To get the best view of tracks, the flashlight should be shined from a low angle to the side of the tracks rather than by direct light from above. Keep in mind, however, that an absence of tacks does not necessarily confirm the absence of rodents - especially for minor infestations. Some rodents are hesitant to walk over distinct patches of powder. If tracks are absent, carefully inspect the area for other signs.

• Video cameras. In addition to (or instead of) night inspections, video cameras can be used to assist in solving rodent and other pest control problems. Cameras which are equipped with low-light capabilities and wide angle lenses can be set up on tripods in areas of suspected rodent activity to literally get a picture of the rodent situation during the evening. This technique is valuable for solving the common "elusive rat" cases in warehouse, food stores, food plants and other areas where a rat occasionally is active.