The yellow sack spider with the Latin name Cheiracanthium inclusum is very common in most of the United States. The yellow sack spider is a cause of many bites in the US and a lot of house spiders are crushed on suspicion of being yellow sac spiders. Its bite corresponds to a bite from a wasp.

Bites from yellow sac spider are also often misidentified as brown recluse spider bites. The symptoms and the development of the wound are quite the same but much less severe.

Life cycle of the yellow sac spider

In the autumn the food is disappearing and the yellow sac spider seeks indoor to find food. Indoors it is often seen on walls and around different constructions. If disturbed it drops to the floor. Egg sacs are laid in corners of all sorts. The egg sacs are white and spunk with silk. The female may guard its egg sac one way of the other so one has to be careful removing egg sacs from a yellow sac spider.

During the summer when there’s plenty of food the yellow sack spider prefers to live on trees, shrubs, and in low vegetation close to open expanses, such as fields. Occasionally it is found in cotton crops.

The yellow sac spider over winters as spiderlings (juveniles) and molt to the adult stage during spring. Females of the yellow sac spider covers her loosely distributed eggs with thin white silk. Adults can be found from April through November, but in the hottest month’s small spiders makes up the largest proportion of the population.

How and when yellow sac spiders searches for prey

Yellow sac spiders are active in the night, where they wander around to find prey. The prey is a wide diet of arthropods, including spiders larger than themselves and even their own eggs.

The spider does not produce webs. Instead they construct sacs in protected areas. The idea of creating sacs instead of webs has given the Yellow Sac Spider its name.

Around 30 percent of adult males get killed and consumed by females at mating. A female produces around 5 egg sacs each with around 37 eggs. They eggs are laid in a loose mass and covered with a thin coat of spun silk.

The strength of the fangs of a yellow sac spider

The chelicerae of yellow silk spiders are very powerful, and the fangs can penetrate human skin quite easily. Most bites on humans occur when people are gardening or performing other kinds of outdoor activities. The venom has mild and local cytotoxic and neurotoxic effects. No fatal incidents from encounters with the yellow sac spider have ever been recorded.

However the bite is quite painful from the outset. A person usually develops redness, swelling, and itching near the site of the bite. Redness disappears after about 72 hours and the skin heals in a week or two.

Sac spiders are the probable cause of more spider bites than any other kind of spider, and their bites are probably often misdiagnosed as brown recluse bites by health care providers.

Preventing spider bites

If you want to prevent you and your family from yellow sac spider bites you can take certain measures. First of all you can shake your clothes before getting dressed. Also you can wear pre inspected clothes when doing garden work or handling firewood etc. Also, by removing your bed from the wall you can minimize the risk of close encounters with the yellow sac spider while asleep.

To protect your house from yellow sac spiders you can install tight fitting screens on windows and doors. You can also seal any crack or crevice a spider can fit into or get access to your house through. Installing yellow light on your front and back porch might also attract fewer insects, which are food for most if not all spiders.

If you want to go further you can remove any kind of debris near the foundation of your house. You can make a tight cleaning schedule in your house or apartment to get rid of insects etc. that will attract spiders (which by the way are not insects) because insects are prey. —