Egg capsules typically may go unnoticed because they are deposited and glued in hidden to semi-hidden locations which are not readily visible or hard to reach, such as behind picture frames or under furniture. Finding a visible egg case is a sure sign of infestation in the home. The German cockroach is the most important and common cockroach in Canada. A concerning pest, the German cockroach reproduces quickly and efficiently.
The female carries around the developing eggs inside the egg capsule and deposits the capsule right before eggs hatch. After depositing an egg capsule, the female can begin producing more eggs in a matter of weeks. As many as 50 nymphs may hatch from a single ootheca. Female German cockroaches usually produce between 4 and 8 egg capsules in a lifetime.
Because German cockroaches produce multiple egg capsules containing large numbers of eggs, populations can boom in a relatively short amount of time. On the other hand, finding cockroach eggs in your home is a telltale sign that you have a cockroach infestation. The difference can be downright frightening, so the sooner you look for and address roach eggs in your home, the safer your family will be from the disease and filth roaches carry with them.
These eggs are all contained in one single casing, called an ootheca. Oothecae are made of a protein substance produced by the female roach. As this substance ages — often just a few hours — it hardens, keeping the cockroach eggs inside safe from predators and the elements. The number of eggs inside each ootheca — and where the ootheca can be found — differs by cockroach species. Some roaches have higher reproductive rates, while some multiply slower.
This means some oothecae you find will have a higher number of eggs inside. Some types of roaches carry their ootheca around with them until the eggs inside are ready to hatch, while others attach the ootheca to sheltered hiding places.
This means that the oothecae of certain roach species will be much harder to find and eliminate before they hatch dozens of roach nymphs. The most common roach in America is the German cockroach.
German cockroaches mate quickly. One female and her offspring can infest a home with more than 30, cockroaches in just a single year. German cockroach oothecae hold between 20 and 40 eggs each. And unfortunately, that infestation is only going to keep on growing until you start treating for it. In fact, one female German cockroach—the most common type of roach in America—and her offspring can infest a home with more than 30, cockroaches in just one year. That said, a huge part of getting rid of cockroaches is also getting rid of the possibility of new cockroaches being born in your home.
To the human eye, the eggs present as a bunch of horizontal lines within the case, and there are usually between 30 to 50 eggs per case, says Scharf.
The female roach keeps the egg case with her because it allows her to give the embryos the moisture they need during the development process. How comforting! Then, about an hour before the embryos are ready to hatch, the German cockroach will drop the egg case off, usually in a sheltered location like the cracks and crevices in your kitchen or bathroom where they typically live.
Other roaches that are commonly found in the home—like the American, the brown-banded, or the smoky brown cockroach—drop their egg cases in the same types of locations.
The German cockroach mom, however, takes extra care of her offspring by carrying her egg case, protruding from her abdomen for two to three weeks, until just before it hatches. Cockroach Egg Case, also known as an ootheca. The egg case of the German cockroach has rows of indentations on each side. Each indentation outlines an egg compartment on the inside that will become a developing cockroach nymph.
Each egg case can hold a total of 30 to 48 developing nymphs.
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