Carpenter ants are nocturnal and are most active at night. Begin looking in the rooms where the greatest numbers are found and observe where they go or come from. Despite claims by their manufacturers, commercially available ant bait stations are relatively ineffective in controlling carpenter ants they are simply just too darn clever.įinding the nest can be difficult since many of the ant’s favorite nesting sites are inaccessible. Most importantly, be sure to make any repairs, if necessary, to keep the area dry. Insecticides labeled for this use include cyfluthrin (sold as Bayer Advanced Home Insect Control for homeowners or Tempo for commercial applicators), Ortho’s Home Insect Defense, or similar products. The best method of controlling an indoor colony of carpenter ants is to locate the nest and treat it directly with a persistent insecticide registered for indoor use. They have also been found in dry areas such as hollow-core doors and false beams, and blue board foam insulation. Carpenter ants are attracted to excessive moisture conditions around windows, doors, showers, bathtubs, dishwashers, leaky pipes and drains, and under leaky roof shingles or roof vents. When they do nest indoors, they prefer an enclosed space that remains wet or damp, more or less, or a permanent basis. However, the presence of carpenter ants in homes during the winter months, when it is too cold outside for ants to be active, is a very strong indication a colony of carpenter ants exists inside the building. Finding them indoors during the summer does not necessarily mean they are nesting in your house, they may just be coming in from outside. Outdoors, they commonly nest in hollow trees and stumps.
Unlike termites, they only nest in wood and do not eat it. Carpenter ants are one of the largest and most common ants in Michigan.
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