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Types of insect eggs & identification guide

Insect eggs in your home or business could mean bad news. Their presence could mean pests could be infiltrating your home in the future. Once they hatch, they could potentially lead to an infestation.

If you think you have issues with insect eggs or other pest control problems, contact Ehrlich or call us at 800-837-5520 to get a property inspection and to discuss pest treatment options.

Why should you care about insect eggs?

Ignoring insect eggs can lead to major infestations. Many species reproduce quickly, and by the time you notice adult pests, hundreds of eggs may have already hatched. Identifying insect eggs early allows for effective and timely pest control.

Some pests, like mosquitoes, can bite and sting. Others, like cockroaches and flies, can spread diseases, while termites can cause structural damage. Knowing how to identify insect egg sacs can help protect your home or business from these dangers.

Common characteristics of insect eggs

The variety of different sizes, shapes, colors, and textures make identifying insect eggs a challenge. Their arrangement and surface characteristics can provide valuable clues about the species and potential infestation risks.

Color

Insect eggs come in various colors depending on the species. Some are pale or white, like bed bugs and flea eggs, while others are brown or dark, such as cockroach oothecae (egg cases). Identifying insect eggs by color can provide clues about the type of pest. Some eggs darken as they near hatching, making it easier to spot developing infestations.

Shape

Egg shapes vary widely among insect species. Many eggs are oval or cylindrical, while others may be elongated or irregular. Some insect eggs have very distinctive formations, such as the lacewing’s stalked eggs or the clustered arrangement of fly eggs. Different types of insect eggs can look similar.

Size

Most insect eggs are tiny, often less than a millimeter in length. However, size differences exist between species. Termite eggs are nearly microscopic, while cockroach egg cases (oothecae) can be several millimeters long. When you identify insect egg sacs, consider their relative size to other objects. Since the human eye might miss smaller eggs, professional insect removal services can help ensure thorough identification and treatment.

Arrangement

How insect eggs are laid can indicate the species responsible. Some pests, such as fleas, scatter their eggs loosely in their environment. Others, like mosquitoes, deposit eggs in tight rows or floating rafts on water, while clustered arrangements are common in beetles and cockroaches.

Texture

Texture plays an important role in insect egg identification. Some eggs have smooth surfaces, while other insect eggs can be ridged or sticky. Fly eggs are soft and must stay moist to hatch, whereas cockroach egg cases have a hardened protective layer. The texture can affect where eggs are found—some adhere to surfaces, while others blend into soil or plant material. If you’re unsure, contact our professional insect control specialists for assistance.

Different types of insect eggs

Not all pest eggs look the same. It is difficult to tell eggs apart, and this is best done by a professional. Here, learn more about egg appearance.

A close-up of a deposit of fly eggs

Fly eggs

Flies in your home or business can be embarrassing. A fly-infested space gives off the impression that the place is dirty and unclean. Unlike the sell-by date of your favorite brand of gourmet chocolate bunnies, on average the common lifespan of a fly is around 30 days they complete their full life cycle within this time period. There are different types of house flies, and while they vary in appearance, their life cycle stages are generally the same.

Fly egg characteristics

  • Laid in large batches ranging from 120 – 1000 depending on the species
  • Usually laid on a host specimen such as an animal carcass or rotting food as well as other unpleasant habitats
  • Hatch into a maggot-like form before making the change into a fly
  • Must remain moist or they will not hatch
A close-up of a deposit of bed bug eggs

Bed bug eggs

Bloodthirsty and nocturnal, bed bugs can be silently laying batches of 10-50 eggs while you sleep. Bed bugs can spread quickly and should not be treated by do-it-yourself methods as they are extremely difficult to completely eliminate without professional help.

Bed bug egg characteristics

  • 1mm long
  • Pearly white color
  • Are laid after an adult has fed
  • Can be found near where the adults hide during the day
  • Are attached to items of furniture or fittings in clusters
Mosquito eggs float on water

Mosquito eggs

In addition to being world-class bloodsuckers, mosquitoes are also prolific breeders. Due to their vampiric nature, they can often be the root cause of the spreading of diseases such as malaria and West Nile Virus. Our mosquito treatments are designed to create a protective barrier around your home or business so you can enjoy your property free from worry. To spot mosquito eggs, be on the lookout for standing water in your yard or landscaping as it only takes a very small amount of pooled water for mosquito eggs to thrive.

Mosquito egg characteristics

  • Laid on the surface of water in batches
  • Batches can consist of up to 300 eggs
  • Dark in color, usually black or brown
  • Narrow and thin in shape
A termite next to some termite eggs

Termite eggs

Termites are one of the most feared pests by homeowners due to the considerable damage they can inflict on the structural wood of their homes. While termite eggs are visible to the naked eye, they are often hidden out of plain sight either in the ground (subterranean termites) or in the wooden galleries they create (drywood termites). Because they’re secretive and love destroying wood, it’s best to schedule a termite inspection with a professional if you’re concerned your property may be infested with termites.

Termite egg characteristics

  • Resemble caviar but smaller
  • Translucent white color
  • Archetypical egg-shaped
  • Queen’s first batch will consist of, on average, 24 eggs

Laid in sheltered locations such as wall interiors and underground nests.

A cockroach egg case

Cockroach eggs

To say the least, there are many different types of roaches, 3,000 known species in fact exist today. Likewise, the eggs that cockroaches lay are diverse and differ from species to species. Some of the more common roach species in the U.S. include the German cockroach, the American cockroach, and the Oriental cockroach.

Cockroach egg characteristics

  • Carried in egg cases known as oothecae
  • Ootheca contain many eggs, enveloped by a protein substance that gradually hardens into a strong protective casing
  • Some cockroach species drop the egg case, while other species carry it until the eggs are ready to hatch
  • The number of eggs nested in the ootheca varies from species to species as well as the number of ootheca produced in a lifetime

For more information please see our cockroach control page.

A flea with flea eggs on top of it

Flea eggs

Fleas: your pet’s worst nightmare. To avoid a nasty flea infestation in your property, be on the lookout for flea eggs. The usual suspects in flea infestations in the U.S., typically include the cat flea and dog flea. Much like cockroaches, flea eggs differ from species to species.

Flea egg characteristics

  • The main population of a flea infestation
  • 90% of a flea infestation is in the egg stage
  • On average a female flea lays more than 30 eggs per day
  • Hard to spot due to their size, approximately 0.5mm
  • White in color and sometimes transparent

For more information please see our flea control page.

A cluster of spider eggs on top of some wood

Spider eggs

While not technically insects, spiders are also a common culprit when it comes to infesting buildings. Although often sources of fear and anxiety for humans, spiders are, for the most part, harmless to humans. Not counting the few venomous spiders in the U.S., spiders often perform natural insect control for pests that could be considered more harmful. However, no one wants to uncover hundreds of spider eggs. The ways in which spiders lay eggs can vary throughout the world depending on the species.

Spider egg characteristics

  • Laid into a silk woven sack
  • The location of the egg sac depends on the breed of spider
  • The time of year during which spider eggs are laid depends on the species
  • The number of eggs laid at a time can vary from 2 to 1000 depending on the spider
  • The number of batches laid in a lifetime depends on species also

Start living pest-free today with PestFree365+. Ehrlich Pest Control protects your home from 39 different pests for the ultimate peace of mind.

Learn about the most common home invaders.

How to identify insect eggs by color

Insect eggs come in a range of colors, with white and yellow being some of the most common. While color can provide a useful clue, it is not always enough for accurate identification.

White insect eggs

Many common types of insect eggs are white or pale. Bed bugs, fleas, and termites lay tiny white eggs that blend into their surroundings, making them difficult to spot. These eggs can sometimes appear translucent or pearly before darkening closer to hatching. Different insect eggs may share similar colors, so relying on color alone may not be enough for accurate identification.

Yellow insect eggs

Yellow insect eggs are often found on plants and soil. Some moths and beetles lay yellow eggs, which can appear in clusters or rows. Mosquito eggs may also have a yellowish tint when freshly laid.

Practical tips for identifying insect eggs

Identifying insect eggs requires careful observation. Use a magnifying glass to examine the size, shape, and texture. Then compare findings with the above insect egg identification guide to determine the pest species.

Check dark, undisturbed areas like baseboards, furniture seams, and storage spaces for eggs. Look for clusters near food sources, damp areas, or hidden crevices. If you’re unsure, contact our insect exterminators, who specialize in insect pest management. A thorough inspection can prevent the eggs from hatching and leading to a larger infestation.

Need help with insect control? We can help

If you suspect that there are insect eggs or common household bugs on your property, contact Ehrlich, your expert in insect control, for an inspection. One of our friendly specialists will take care of the issue so you are pest-free.

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