Ants are one of the most successful animals on Earth. They thrive in many ecosystems due to their social organization, which allows them to defend themselves, exploit resources and modify habitats. Unfortunately, they can wreak havoc on home environments.

To understand how to get rid of ants, it is important to understand how they live and how they sustain themselves.

Ants are social insects in the Formicidae family and are most closely related to bees and wasps. They live in colonies, although the size of the colony varies greatly depending on the species. Some species have colonies of only a few dozen individuals, while others form colonies with many millions of ants over a large area. Most of the ants in a large colony are sterile females that belong to the worker or soldier castes. Other castes include the royalty caste, or queens, which are the only fertile females in an ant colony. Drones are fertile males, whose sole function is to fertilize the queen. Scientists often refer to ant colonies as super organisms, since the individual ants function as single entity to support the colony.

Ohio State University reports that over 14,000 species of ants have been classified of the estimated 22,000 species that exist. Virtually all land masses on Earth have native ant species, except for Antarctica and a few large islands like Greenland, Iceland, and the Hawaiian Islands. They occupy many ecological niches, although most species are general omnivores. However, some species are more specialized feeders, including obligate carnivores and herbivores. Ants comprise 15 to 25% of the biomass of terrestrial animals, according to Proceedings of the National Academy of Sciences.

Identification

Ants have six legs and an exoskeleton, like all other insects. The exoskeleton provides the body with structural strength, as an internal skeleton does with vertebrates. It also serves as an attachment point for muscles and allows the passage of gases such as oxygen and carbon dioxide with small valves known as spiracles.

An ant’s distinctive body shape is characterized by its three primary body segments, which consists of its head, mesosoma and metasoma. The mesosoma is the fusion of the thorax and first abdominal segment. The metasoma is composed of a narrow waist, or petiole, and the remaining abdominal segments, which are known as the gaster. All six of an ant’s legs are attached to the thorax. The queens and drones of most ant species also have wings that they shed after their nuptial flight.

Do You Have an Ant Infestation?

A long trail of ants is one of the strongest signs that a building has an ant infestation, according to InterNACHI. Straggler ants that aren’t part of the mainline are likely to be scouts in search of new sources of food and water. A trail and often forms on a pipe or wire that allows the ants to easily travel in and out of a building. You may be able to trace a line of ants back to its entry point, which is usually a gap in the baseboard or around a water pipe. A trail may contain hundreds, or even thousands, of ants.

A carpenter ant is the collective name for over 1,000 species of wood-cutting ants in the Camponotus genus. These ants produce a type of fine sawdust known as frass, which is another common sign of ant infestation. Tap on a piece of woodwork that you suspect of being infested to see if any frass falls away from it. The ants in a large nest may also produce a perceptible rustling noise similar to that of crinkling cellophane.

Outdoors

Most ant species build complex nests, although a few nomadic species do not build any permanent structures. Depending on the particular species, they build nests of soil and plant matter underground, inside logs, on in trees. Ants usually select a nest site very carefully to avoid diseases and predators. Biology Letters reports that the species Temnothorax albipennis will avoid building a nest in an area with dead ants.

The most easily recognizable ant nest has a pile of material above its entrance, which is primarily composed of dirt. Workers dig tunnels and chambers in the ground and deposit the excavated earth outside. Most species form a simple pile with this material, although a few sculpt it into a specific shape.

Ants in the Kitchen

The presence of food makes kitchens a common infestation site for small species like Argentine ants, odorous house ants, pavement ants, pharaoh ants, and thief ants. They are primarily attracted to sources of simple sugar, such as table sugar, syrup, honey, and fruit juice. They may also be attracted to protein sources such as meat and pet food.

Ants will typically continue invading the kitchen unless they’re treated, especially if there is enough food and water to support additional colonies. Multiple colonies will make the ants much more difficult to eradicate, since each colony will have at least one queen. A kitchen with abundant food and water may also cause the ants to build nests inside the house.

Other Sites for Ant Infestations

Locating the nest is highly helpful for dealing with a severe indoor infestation, since it will indicate the best methods for treating the infestation and preventing future recurrences. Keep in mind that this nest may be inside or outside. Even if an ant nest is outdoors, ants may enter from the outside to forage or seek shelter from bad weather. Since some species live outside exclusively and only come indoors for those reasons, it helps to be able to identify the species.

A line of ants entering a house through a crack in a door or window is a strong indication that the nest is outside. But a line that goes into a cabinet or wall more indicates that the nest is more likely to be indoors. A potted house plant is also a common location for an indoor ant nest.

Treating Ant Infestations

Treatments for ant infestations include as baiting, chemical and natural methods. The best choice often depends on the species, since this determines preferences for food and nest sites. The most effective methods generally involve killing the queens, as they are a colony’s only reproducing females.

Baiting

The most common active ingredient for ant bait is borax, which is effective for several reasons. Borax is inexpensive because it occurs naturally in seasonal lake beds at high levels of purity. It’s also highly lethal to ants, but only mildly toxic to humans. Furthermore, ants eagerly seek out borax because it has a sweet taste.

Ant bait works very slowly, allowing the workers to make multiple trips to the bait source. The workers lay down pheromone trails, which attract more workers. This habit means that ant baits will initially cause more ants to be visible as they form lines to the bait source. Do not disturb these lines once you have set the ant bait.  Let them retrieve the bait and carry it back to the nest. This bait will eventually kill the individual workers that consume it, but its primary purpose is to kill the queen.

Chemical Ant Control

Chemical forms of ant control are rated for indoor or outdoor use, so it’s important to ensure that you use a product that’s appropriate for the location. Indoor insecticides are generally much less toxic because they will be used in closer proximity to humans. These products may be in spray or powder form, with deltamethrin and permethrin being the most common active ingredients.

Eradicating an ant nest in the house often involves drilling small holes in the wall near the floor. Insecticidal dust may then be applied through the holes with a special applicator or plastic bottle with a nozzle. It’s important not to apply too much dust, as this could cause the ants to avoid it or abandon the nest entirely.

Ant pesticides for outdoor use typically use one of the following active ingredients:

  • Acephate
  • Nifenthrin
  • Carbaryl
  • Cyfluthrin
  • Permethrin

Acephate is used for liquid pesticides, while bifenthrin and cyfluthrin are the active ingredients in solid pesticides. Carbaryl and permethrin used in both liquid and solid pesticides. Liquid pesticides should generally be allowed to soak into the nest, while solid pesticides are placed outside the nest so they appear to be a food source. Both types of pesticides often require multiple applications to kill the queen, especially if the nest is large.

Natural Methods

The most common natural methods of ant control involve removing potential food sources from your house. Cleaning kitchen surfaces and vacuum carpets daily. Rinse recyclable containers to remove all traces of food before storage. A mild solution of soapy water can temporarily disrupt ant trails, and this keeps them from reaching food sources. Cracks in the walls and floor boards should also be caulked to prevent ants from entering the house.

Prevention

Preventing ants from infesting your home in the first is typically much easier than controlling them once they’ve become established. Prevention methods may be classified into the following categories:

  • Cleaning
  • Food storage
  • Dehydration
  • Sealing

Remove pheromones around the house’s entry points, thus preventing other ants from following a trail. Scrub these areas with a mild solution of soap and water. Clean up spilled food in the kitchen to avoid attracting ants.

Keep food in sealed containers, especially those containing sugar. Dispose of unused pet food instead of allowing it to remain in a dish. Taking out the garbage regularly keeps the smell from attracting ants.

Minimize the amount of water around your house by fixing leaky pipes. Ensure that your gutters drain water away from your house. You may also want to remove excess moisture from the air with a dehumidifier if you live in a humid area.

Seal any entrance points for ants in your house, which primarily includes cracks in your foundations, walls and windows. Caulk is the most common sealant for this purpose, although the best choice may depend on the specific material that you’re sealing.

Top Tips for Ant Control

Baiting is one of the most effective methods of controlling ant infestations, especially when you can’t locate the nest or easily access it. Remember that this method will require several days to kill the queen. The number of visible ants will also increase during this time as they carry the bait back to the nest.

Contact pesticides are the best way to kill visible ants, especially if they don’t have a well-established nest. These pesticides work quickly and have residual effects that last for weeks. Contact pesticides are typically used in specific areas that aren’t used to prepare food.

Granules are the most effective type of pesticide for preventing ants from entering your home. They are effective as a general perimeter defense because you can apply it around the outside of your house. However, granules are much more effective against a known nest. In this case, you will create a circle of granules around the nest.

When to Call a Professional

A professional pest controller may be necessary if there are multiple nests, or even a single large nest, invading your house.

Be aware that wood-cutting species such as carpenter ants often cause property damage that require a contractor to repair. These ants can bore long tunnels, or galleries, in wood that that can greatly weaken load-bearing structures in your house.

Professional pest controllers typically handle a range of insects, although they may also specialize in a particular species. They are likely to be highly experienced with a particular ant species that are pests in your area, as well as pesticides and treatment methods that are safe for children and pets. These professionals frequently provide free estimates, allowing you to determine the severity of the infestation before making a financial commitment.

Source

http://atbi.biosci.ohio-state.edu/hymenoptera/tsa.sppcount?the_taxon=Formicidae
http://www.pnas.org/content/97/26/14028
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1626204/