Yellow Sac Spider: Identification and Extermination

The yellow sac spider, belonging to the genus Cheiracanthium, is a common and distinctive spider species known for its sac-like web structures and nocturnal habits. Found in various habitats worldwide, these arachnids have piqued the curiosity of researchers and spider enthusiasts. In this informative article, we explore the fascinating world of yellow sac spiders, providing valuable insights into identifying these spiders, understanding their behavior, and discussing effective techniques for managing their presence, if necessary.



Size: Adult yellow sac spiders exhibit a size range of 5 to 10 mm in body length, with females generally being larger than males. Their compact yet intriguing physique contributes to their distinct presence in the arachnid world.

Coloration: These spiders display a captivating coloration, typically ranging from pale yellow to light greenish hues. Their bodies often feature darker markings, adding a touch of intricacy to their appearance. In contrast, their legs tend to be lighter in color, creating a visually striking contrast.

Sac-like Webs: Yellow sac spiders are skilled web builders and are known for constructing distinctive sac-like webs. These webs can be found nestled within vegetation, corners of walls, and other sheltered areas, serving as both retreats and hunting grounds. The silk structures, delicately spun by the spiders, provide them with a secure refuge during the day and a strategic vantage point for nocturnal hunting.


  1. Sac-like Webs: Yellow sac spiders are known for constructing sac-like web structures, which they use as shelters during the day and hunting grounds at night. These webs are typically built in crevices, corners, and vegetation, and they are not as visible as the traditional orb-shaped spider webs.
  2. Nocturnal Hunters: Yellow sac spiders are primarily active during the night, making them nocturnal hunters. They use their keen senses and agile movements to hunt down small insects, such as flies and gnats, which they capture within their sac-like webs.
  3. Venomous Bite: Like many spiders, yellow sac spiders possess venom that they use to subdue their prey. While their bite is venomous, it is generally not considered dangerous to humans. However, some individuals may experience localized pain, swelling, or itching as a reaction to the bite.
  4. Habitat and Distribution: Yellow sac spiders are found in various habitats worldwide, including forests, gardens, grasslands, and even inside human dwellings. They have adapted well to urban environments and are often encountered indoors, especially during the colder months when they seek shelter.
  5. Mating and Reproduction: Male yellow sac spiders go through a courtship ritual to attract females, involving intricate leg movements and vibrations. After mating, the female lays her eggs in silken sacs and guards them until they hatch. The spiderlings then disperse and establish their own territories.

Extermination Techniques

If the presence of yellow sac spiders becomes a concern, the following extermination techniques can be employed:

Non-Chemical Methods:

Physical Removal: Use a vacuum cleaner or a soft brush to capture and remove yellow sac spiders and their sacs from infested areas. Seal and dispose of the collected spiders appropriately.

Habitat Modification: Clear clutter, seal entry points, and remove potential hiding spots to discourage yellow sac spiders from establishing populations.

Chemical Control:

Targeted Insecticides: In severe infestations or specific situations, professional pest control services may apply targeted insecticides labeled for spider control. Seek advice from a licensed pest control expert to determine the best course of action.


For professional assistance or more information, please contact our pest control experts who have extensive knowledge and experience in dealing with spider infestations.