How Do Cockroaches Reproduce?

Cockroaches can reproduce at an alarming rate, which is bad news if you have them in your home! Just a few roaches can rapidly become an infestation and large numbers of the critters can have serious health implications for you and your family.

Cockroaches carry a whole host of diseases on their bodies, as they spend much of their time hanging out in sewers and drains. They then contaminate everything they touch, leaving potentially harmful bacteria on food, work surfaces, and food preparation areas. Roaches have also been found to cause asthma in people who have prolonged exposure to them. Cockroach allergens (such as skin and feces) can aggravate allergies or even trigger asthma attacks, especially if they are present in large numbers.

As if you didn’t need any more reasons to despise these filthy insects, cockroaches also reek. They secrete an oily substance all over their bodies which has an unpleasant, musty odor. A large population of roaches can, therefore, seriously stink up your house and may even start to affect the taste of your food.

If you see even one cockroach on your property, you need to take action quickly! Roaches are prolific breeders and can multiply with lightning speed. Some species (such as the German roach) can produce up to 300 young per year. If you leave the problem unaddressed, you’ll soon find that you’re living with thousands of these nasty bugs!

But how exactly do cockroaches reproduce? Read on to learn the basics of roach reproduction, from mating to egg hatching and everything in between!

Cockroach reproduction vocab

  • Pheromone – A chemical substance released into the external environment by animals which affects the behavior of other members of the same species.
  • Spermatophore – A protein capsule containing sperm.
  • Ootheca – A protective protein casing used to contain fertilized roach eggs.

How do cockroaches reproduce?

First, the birds and the bees – how exactly do cockroaches mate?

It all starts with pheromones. Male and female cockroaches both produce pheromones, which are used to send sex signals to other roaches in the surrounding area. Once they’ve attracted a mate, cockroaches then engage in courtship rituals. In the case of the American cockroach, females begin the dance by raising their wings to expose the membranes beneath. They also expand their genital chambers while releasing more sex pheromones, signaling to the male that they’re ready to mate.

Attracted males will approach the female and raise their wings to communicate their interest. They will then back into her, depositing sperm (in the form of a spermatophore) into her genital chamber.

Once fertilization has occurred, the female cockroach will lay her eggs in a protective protein casing known as an ootheca. She will then carry the ootheca on her abdomen before finding a safe place to deposit it. The length of time roaches carry their eggs varies from species to species. The American cockroach will carry the ootheca for a few hours or days before depositing it in a protected area, gluing it to the floor with saliva. The German roach, on the other hand, will carry her eggs until a few hours before hatching.

Cockroaches mating


Where do roaches lay eggs?

Cockroaches deposit their eggs in protected areas, such as cracks, crevices and underneath furniture. They will usually choose somewhere close to food and water sources, as the baby roaches will need to fend for themselves as soon as they hatch.

Cockroaches prefer warm, humid environments and can most often be found in kitchens and bathrooms. However, it is not uncommon for them to invade your bedroom! Roaches can and will lay eggs anywhere they find a protected area, including dressers and wardrobes. If you think you have cockroaches in your bedroom, you will need to carefully check your clothes and shoes for eggs.

How many roaches are in an egg?

Each egg contains one cockroach. However, roaches lay multiple eggs at once, which are kept clustered together in the ootheca. The number of eggs per ootheca varies from species to species. In the case of American cockroaches, each ootheca will contain 14-16 eggs. German roaches produce much more young, and will typically lay up to 48 eggs at a time.

How long does it take for roach eggs to hatch?

It takes different amounts of time for roach eggs to hatch, depending on the species. German cockroach babies will emerge from their eggs after only 3 weeks, whereas American cockroach eggs take 6 weeks to hatch.

How fast do roaches reproduce?

Cockroaches can multiply with frightening speed, increasing their numbers very rapidly. This means that even one or two roaches can turn into an enormous infestation in no time at all! The German cockroach, in particular, is a prolific breeder and may produce twice as many offspring as other roach species. Over the course of a year, a single female roach may produce up to 300 babies! These babies will reach sexual maturity and begin breeding themselves in a matter of weeks, causing their numbers to skyrocket.

American roaches produce fewer babies than their German cousins, but can still multiply very quickly. Each female American cockroach can have up to 150 babies per year. American roaches have longer lifespans than German cockroaches, with adult surviving for up to 400 days after reaching sexual maturity.

The bottom line…

Roaches reproduce quickly, producing hundreds of offspring in a single year. This means that if you find even just one or two roaches in your house, you need to act quickly to stop the situation from getting out of hand! Taking the appropriate steps to eradicate your roaches immediately can prevent an all-out infestation, so don’t delay in taking the necessary action!



Very simple and understandable. I just love that.

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