Only black widow females can cause an envenomating bite to humans. They are usually brushed up against in their webs built-in quiet, protected places low to the ground. Their venom contains a neurotoxin that causes constant muscle contraction, which can produce severe pain that lasts for several days. Black widow spider bites do not develop necrotic lesions and are rarely fatal.
Heavy black widow spider populations are usually a result of poor storage practices, both indoors and outdoors. They are also common in crawlspaces. Wearing thick gloves while inspecting can help reduce the risk of a spider bite. Treat spiders and egg sacs directly with a knockdown product before removing their webs. Residual spot applications can be made to areas prone to web building.
Photo by Chaz Estrada
Call (800) 888-4897 to order or visit the Online Store.
Check out our Common Spiders & Their Management ProTraining course:
Of the many spider species that exist, those that actively hunt or spin webs are the most common in pest management. A very small percentage of species are medically important. After completing this course, you should be able to identify spiders that are common in and around structures, recognize which spiders are medically important, and know the different approaches to managing spiders that wander or build webs.
Sign in to your PestWeb account now, or become a PestWeb member to start learning online.