Pharaoh’s Ants

  • Scientific Name: Monomorium pharaonis

Pharaoh’s ants

Scientific Name:

Monomorium pharaonis

How to identify Pharaoh’s ants

Pharaoh’s ants (Monomorium pharaonis) a species which is rare in Australia but fairly common in Europe and the USA. They form large colonies with multiple queens which can take a number of workers with them and start new colonies if disturbed by insecticides. The ants are 1.5-2.0 mm in size, light yellowish brown to darker brown in colour. They will eat protein foods plus fatty or sweet foods.

Where are pharoah ants commonly found?

They commonly nest inside buildings especially near warmer areas e.g. heating ducts.

Why are pharoah ants considred pests?

 Fortunately for us, they are not generally considered to be health pests although the relatively rare Pharaoh’s ants which are often found inside hospitals are potential disease carriers as they can invade dressings of patients confined to beds and thus pose a real menace.

Some nest in decaying timber and may be suspected of actually destroying it whereas they will only infest decaying timber. Most foraging workers come from the exterior of premises but it is not particularly uncommon to find nests in roof voids, cavity walls, behind skirting boards, inside motors, inside window screens, under bath tubs, behind tiles in bathrooms and kitchens and behind taps.

In short, they like similar locations to cockroaches and as a result, control methods are very similar. Because of their nesting habits, it is common to find piles of gritty material on the floor or other horizontal surfaces or around door and window frames. On closer inspection, these piles may be found to contain dead ants which have been thrown out of the nest. No matter how
often you sweep up the mess, it will re-appear as long as the
ants are active.

This habit of making a little mess is not a mammoth problem but ants do become a nuisance when they are spotted walking inside pantries and getting into food containers, trailing along bench tops, window sills, skirting boards, bath tubs and invading shower recesses.

What is the biology and lifecycle of pharoah ants?

The pharaoh ant queen can lay hundreds of eggs in her lifetime. Most lay 10 to 12 eggs per batch in the early days of egg production and only four to seven eggs per batch later. At 27 °C (80 °F) and 80 percent relative humidity, eggs hatch in five to seven days. The larval period is 18 to 19 days, pre-pupal period three days and pupal period nine days. About four more days are required to produce sexual female and male forms. From egg to sexual maturity, it takes the pharaoh ant about 38 to 45 days, depending on temperature and relative humidity. They breed continuously throughout the year in heated buildings and mating occurs in the nest. Mature colonies contain several queens, winged males, workers, eggs, larvae, pre-pupae and pupae.

Management Tips for Pharaoh's Ants

Effective control depends upon a number of factors:
  1. The particular species involved,
  2. The location of the nest site(s) and,
  3. The degree of concern they are causing the occupants.

It may be easy to control a colony with a single queen (Camponotus spp), or difficult in the case of species with multiple queens and multiple “homes” and which do not display aggression to workers from other nests (Argentine ants, Odorous house ants and Pharaoh’s ants). That is why correct identification is essential before you begin your campaign.

Ant granules were perfect for the control of some ant species to exterior areas. Most insecticide manufacturers suggest that a two-pronged approach with both baits and liquid sprays be used in order to obtain best results. These manufacturers all supply bulletins with complete instructions on how to use their products. The product labels and these bulletins should all be studied before using any of the materials.

The basic rules for the use of baits are:
  • The basic premise is that bait should hopefully be consumed within 1 to 2 days when their palatability and moisture content are highest. The ants should die within 3 to 4 days.
  • Correct identification – by knowing the species, you can choose the right bait for the job and can also help you find their feeding, trailing and nesting sites.
  • Find the trails – you must place the bait where the ants are otherwise you are wasting time and bait. If the ants aren’t active at the time, you can pre-bait first with non-toxic foodstuffs. This will help you determine where the ants are feeding and what type of food they prefer.
  • Choose the correct bait formulation, they may prefer sweet foods or protein based materials. Sometimes the same species will change food preferences depending upon seasons or other conditions. Therefore, you need to have a range of baits in your kit bag. If you just put a small blob of each bait in the ant trails, you will very soon find which they prefer.
Some key rules to observe are:
  • Place the bait as close as possible to ant trails which are usually near feeding or nesting sites.
  • Place adequate amounts of bait out to ensure that they will continue to feed until your next visit. By placing the bait in purpose designed “ant cafes,” you will extend the life of the bait.
  • Avoid food competition by asking the client to remove available foodstuffs and liquids.
  • Avoid placing gel baits near sources of heat as the gel matrix may become liquefied and moisture loss may increase. Also, avoid placing them on dry or porous surfaces which may increase water loss and make them less palatable to ants.
  • Some baits lose their potency after only a few days exposure to sunlight. Make sure that you know which they are and replace them as required.
  • Some granulated baits lose their potency around three months after the container has been opened. Make sure that you write on the container the date on which it was opened.
  • A common piece of advice is that you mustn’t place baits on surfaces that have or will be treated with liquid or powder insecticides. Studies carried out by some researchers have indicated that this is not the case and the baits are still palatable. Some pest managers have stated, “Why waste money by applying two formulations?” and that is probably a good rule to live by. You may be able to control the ant problem without the use of insecticidal sprays and dusts but, all manufacturers recommend that bait applications are supplemented by the use of such formulations when treating free standing buildings. These insecticidal barriers will serve to prevent future ant activity to the interior.
The basic rules for the use of residual insecticide sprays are:
  • Non-repellent formulations are considered superior to repellent formulations e.g. synthetic pyrethroids, as the ants will track through the non-repellent insecticide unknowingly. Examples of non-repellent actives and formulations are Bendiocarb (Ficam), Fipronil (Termidor), Indoxacarb (Arilon), Chlorfenapyr (Phantom).
  • The sprays should be applied as a barrier to the base of foundation walls, fence lines and garden beds.
  • Re-application of the sprays may be necessary after rain.
  • Insecticidal dusts should be applied to roof voids where practical.

PRODUCT SOLUTIONS FOR Pharaoh’s Ants

Each pest control product is registered for use in specific environments, situations, pest life stages and other key factors. Please always consult the product label for detailed information about how to use each product.

Seclira Pressurised Insecticide 397g
5g/kg Diontefuran

Seclira Pressurised Insecticide is a fast-acting, non-repellent, ready-to-use product with System III compatibility for the control of a broad range of pests including ants, and cockroaches.

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Seclira WSG Insecticide
400g/kg Dinotefuran

Seclira® WSG insecticide is a non-staining, odourless, broad spectrum, general insect control product for indoor and outdoor use.

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Termidor SC Residual Termiticide
100g/L Fipronil

Termidor SC Residual Termiticide and Insecticide provides superior levels of control across subterranean termites, ants, cockroaches, spiders, and flies.

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Maxforce Quantum Liquid Ant Bait (3 X 30g)
0.3g/L Imidacloprid

Maxforce® Quantum is a patented viscous liquid ant bait made of 99.9% naturally derived ingredients.

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Suspend Flexx Insecticide
25g/L Deltamethrin

Suspend Flexx Insecticide is a synthetic pyrethroid (3A) formulation for the knockdown and residual control of a range of insect pests in various indoor and outdoor situations.

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Biflex Aqua Max Insecticide and Termiticide
100g/L Bifenthrin

Biflex AquaMax is the first ever Professional Strength, multi-insecticide and termiticide. Effective on a wide range of common household pests and all termite species in Australia.

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PCO Deltamethrin 10SC
10g/L Deltamethrin

PCO Deltamethrin 10SC is formulated for the control of a range of insect pests, Cockroaches, Web-spinning Spiders, Non web-spinning Spiders, Ant, Fleas, Silverfish, Bed Bugs, Bird Mite, Carpet Beetle, Clothes Moth, Mosquitoes, House Flies, Stored Product Pests in various situations.

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PCO Deltamethrin Tetramethrin 10SC 5L
10g/L Deltamethrin, 10g/L Tetramethrin, 80g/L Piperonyl Butoxide

PCO Deltamethrin Tetramethrin is formulated for the control of a range of insect pests including: Ants, Cockroaches, Fleas, Silverfish, Spiders, Bird Mites, Carpet Beetles, Clothes Moths, Bed Bugs House Flies and Mosquitoes in various situations.

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PCO Fipronil 100SC Termiticide and Insecticide
100g/L Fipronil

PCO Fiponil 100SC is a cost effective non-repellent termiticide and insecticide for the control of Termites and nuisance ants. Formulated in Australia to a high standard.

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Advion Ant Gel
0.5g/kg Indoxacarb

Advion Ant Gel targets most pest species of ants, including all key sweet feeders plus additional ant species. This is a highly attractive ant gel that locks in moisture for extended appeal to ants and uses active ingredient Indoxacarb.

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Arilon Insecticide
200g/kg Indoxacarb

Arilon® is a non-repellent insecticide which provides excellent control of ants, cockroaches and other key insect pest species on a variety of interior and exterior surfaces.

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Demand 100CS Insecticide
100g/L Lambda-Cyhalothrin

Demand 100CS is a cost effective and long lasting insecticide for the controls of ants, cockroaches, fleas, flies, mosquitoes, silverfish and spiders for up to up to 12 months indoors and up to 3 months outdoors. It can be applied to foliage for up to 14 weeks of mosquito control.

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Attractant PRO Ant Gel 50g
0.5g/kg Indoxacarb

Attractant PRO Ant Gel is formulated for the control of major pest ants including Argentine ant, Black house ant, Coastal brown ant, Ghost ant, Hairy ant/Crazy ant, Pedicel ant, Pennant ant, Pharaoh’s ant, Red imported fire ant, Sugar ant.

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Delta Pro 25SC Professional Insecticide
25g/L Deltamethrin

For the control of a range of insect pests such as spiders, cockroaches, flies, ants, mosquitoes in various situations.

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Ensnare Pro 50SC Insecticide 1L
50g/L Indoxacarb

EnsnarePRO is a non-repellent residual suspension concentrate spray. It can be used in conjunction with baits without reducing the performance of the bait. Ants, cockroaches and flies don’t know it’s there. The ‘non-repellent’ properties of this formulation does not interfer with insects natural behaviour...

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Quench Pro Liquid Ant Bait
0.05g/kg Imidacloprid

QuenchPRO is a ready-to-use liquid ant bait in a low dose that is effective against many common pest ants in indoors and outdoors situations. It contains a sweet based bait matrix that foraging ants are attracted to.

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Anthem Insecticide Granules
0.5g/kg Fipronil

Anthem Insecticide Granule contains 0.5g/kg of Fipronil and is used for the control of Argentine stem weevil, mole crickets and ants in commercial and recreational turf and control of ants in external surrounds of buildings and structures

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Chaindrite Perforce 500 Residual Insecticide
500 g/L Permethrin

Chaindrite Perforce 500 Residual Insecticide is formulated for the control of a broad range of insects in various situations as per the Directions for Use table.

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Fipforce Dust Termiticide and Insecticide
5g/kg Fipronil

Fipforce Dust Termiticide and Insecticide contains 5g/kg of Fipronil which is toxic to insects by contact or ingestion. FipForce Dust is applied through a hand duster to help in the control of Termites, Nuisance ants and Cockroaches. It has a mineral based carrier which flows extremely well and is less susceptible to moisture than cellulose based dusts. Less moisture build-up means less clogging of the application procedure.

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Shieldrite Crawling Insect Foam 350g
0.5g/kg Imidacloprid

Shieldrite Crawling Insect Foam is a non repellent suspension concentrate formulated into a ready to use foam for the use in the management of pest insects including Termites, European wasps, Ants, Cockroaches and Bed bugs.

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