Pest Control: Tips From A Pro

(Page 6 of 6)

February/March 1999
By Jeff A. Lee 
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 Rub marks: Along runways, dark greasy rub marks appear from contact with the rodent's body. Rub marks on walls appear as black smudges left by the rodent. New rub marks are soft and will smudge. Old rub marks are brittle and will flake when scratched. Rafters may show swing marks of roof rats.

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Tracks: To detect rodent activity, spread dust material like talcum powder along runways. Foot marks of rats (five-toe hind foot, four-toe front foot) or tail drag marks will show in the powder.

Burrows: Norway rats burrow for nesting and harborage. Burrows are usually found in earth banks, along walls, and under rubbish and concrete slabs. Freshly dug dirt scattered in front of three-inch openings with runways leading to the openings is characteristic. Burrows usually are 18 inches deep in most soils. Slick, hard-packed runways indicate an old, established colony.

--Courtesy of the Florida Cooperative Extension Service, Institute of Food and I, Agricultural Sciences, University of Florida.

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