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You may have seen spiders scurrying around inside or outside your property, but chances are, you haven’t thought much about where these spiders come from - namely, their eggs. Since eggs are where spiders originate, you should become informed about them, in the case that you have spider egg sacs in your home or business.

Take time to learn more here about spider egg sacs, the eggs of some different kinds of spiders, and how to get rid of spider eggs. If you’re concerned about spiders inside your property, reach out to Western Exterminator at 800-937-8398 or contact us online to have an expert take a look at the problem.


Do spiders lay eggs?

Yes, spiders lay eggs. After female spiders mate with males, they keep sperm in a holding place so they can fertilize the eggs. They fertilize the eggs right before laying them.

How many eggs do spiders lay?

Most female spiders yield many eggs in order to make sure the species survives. Up to several hundred eggs are put in a sac. Females can create more than one sac but that differs based on the species.

Female spiders’ abdomens may expand due to a high amount of eggs, and their bodies contract after they lay the eggs. Spider eggs are laid during different times. For example, hobo spider females lay eggs in mid-September to October, but brown recluse spiders typically lay eggs between May and July.

Spider egg sac

Typically, spider eggs are contained in a silken sac, which guards the eggs from predators as well as changing temperatures. An egg sac can be larger than the actual spider. Spider egg sacs don’t all look alike - they may be flat or round or look like something else, and they can have varied colors such as brown or white.

The cocoon can be located in the soil, hang in a web, be held to a leaf, or can be found elsewhere. Long-bodied female cellar spiders usually transport their egg sacs between their jaws until the eggs hatch. Other spiders - like the wolf spider, for instance - also tote their egg sacs. Nursery-web spiders carry their egg sacs as well and create a spot for their egg sac to rest when the eggs are close to hatching. Spiders that yield multiple cocoons have an inclination to desert them.

Read about the egg sacs of a couple of spiders below. If you are seeing spider egg sacs around your home and have concerns, contact Western Exterminator immediately.

Black widow spider eggs

You may have heard about the symptoms of a black widow spider bite. But how much do you know about black widow spider eggs? Female black widows put eggs in silk egg sacs that have a diameter of about ⅜ inches to ½ inches. Western black widow spider egg sacs are yellowish in color and are shaped like teardrops. Their sacs typically have about 300 eggs.

Brown widow spider eggs

Brown widow spiders are grayish-brown or brown in color. Their egg sacs are yellow in color, round and have silk spikes, in contrast to western black widow spider egg sacs, which are smooth. The spikes give the brown widow spider egg sacs a distinguishable look. The brown widow spiders lays about 120 to 150 eggs for each sac. It has the ability to create 20 egg sacs during its life.

Spider eggs hatching

The young spiders may not hatch for weeks. Some spiderlings remain in eggs during the winter and hatch in the spring; others hatch in a shorter period of time.

Spiderlings leave the sac after molting. At this time, they are pale in color. Actually, it is possible at times to view evidence of the first molts in the egg sac under a magnifying glass. In a phenomenon known as ballooning, the early-stage spiders in many species climb to a high spot and float onto the wind on silk threads in order to disperse.

Most spiders take about a year to become adults. They undergo roughly 4 to 12 molts before becoming mature. Compared to females, males typically go through fewer molts - they have smaller bodies.

How to get rid of spider eggs

If you spot spider eggs in your home or business, they should be removed. One option is to use a vacuum to remove spider egg sacs. Make sure to shut the bag and take it outside right away. But if spiders have overrun your property, or you’re simply concerned about the presence of a few of these pests, contact Western Exterminator at 800-937-8398 today to have the issue inspected.

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