These native spiders occur in North America, being found in all states and in southern Canada. Other species may be found worldwide. The black widow spiders are the most dangerous spiders to humans in the U.S. They are one of the few spiders capable of biting humans that inject a neurotoxin, and the effect of the bite can be serious and potentially fatal. Only females
bite humans, but both males and females construct webs to capture other prey, primarily flying insects. Males also enter a female’s web for mating, and if the female is not receptive the male may be eaten. The life span of black widow females averages around 180 days. The female may produce up to 9 egg sacs with about 350 eggs per sac on average. She will be most aggressive and defensive of her webbing while she is guarding these eggs, as well as being more hungry following egg production. The new spiderlings emerge from the sac and remain near it for a day or two, but then they undergo “ballooning” to disperse, creating long silk strands that are carried away by the wind. Black widows are generally reclusive spiders that create their webs in areas of inactivity. The web is made of extremely strong silk that is ver y sticky, and it has a very haphazard appearance without the symmetry of some other spiders. Females are recognized by their shiny black body, long thin legs, large oval abdomen, and red “hourglass” pattern on the underside of the abdomen. Males body color is mottled brown and white. The female tends to hang upside down in her web due to the weight of the abdomen. Eggs sacs of black widows are about ½ inch in diameter and are smooth surfaced. Bugs-B-Dead offers a comprehensive spider service including de-webbing with a sweep, and an eco friendly treatment to control your Black Widow Spider problems.
The Brown Widow comes from South Africa. They are usually found around buildings in tropical areas. It has migrated to many parts of the world, however recently they have been found in great numbers in San Diego County. The Brown Widow spider is smaller and generally lighter in color than the Black Widow. The Brown Widow has a hourglass shaped marking on its underside, usually it is a vivid orange or a yellowish color. The brown widow spider has a neurotoxic venom that, drop for drop, is as toxic as the black widow's. However, brown widow bites are usually not very dangerous, bites are minor compared to Black Widow bites, because they cannot deliver the same amount of venom as the Black Widow. Brown Widows can be located by finding their egg sacs, which are easily identifiable. They are round and have pointed projections all over, and they are sometimes described as "spiky" in appearance. Eggs hatch in approximately 20 days. Female brown widows lay about 80 eggs per sac and can make 20 egg sacs over a lifetime. Elimination of unnecessary debris in storage or on the exterior will reduce harborage sites, including lumber or firewood piles, boards or other materials on the ground, and yard debris. Materials stored in garages or other interior storage areas can be kept off the floor and in a condition that allows access to the areas behind them and the webbing then removed with a sweep. For the best results have Bugs-B-Dead perform a spider elimination service which includes a comprehensive de-webbing with a sweep, and an eco friendly treatment to control your Black Widow Spider problems.
The Brown Recluse are native to the United States, from of western Florida to Texas and north to Iowa. It has been found sporadically as a transient in other states. However WE DO NOT HAVE BROWN RECLUSE SPIDERS IN SAN DIEGO COUNTY due to the climate
The Brown Recluse, has a reputation that far exceeds reality. It is a hunting spider that uses it web only for lining its retreat and for covering its eggs. It is very capable of biting humans, and the venom is a cyto-toxic venom which causes tissue death at the site of the bite, possibly leading to a large, infected, and lingering wound. However, experts believe that most skin infections blamed on this spider’s bite are actually bacterial infections, particularly in states with very high reported bites but very low confirmed presence of the spider. The Brown Recluse lives commonly in structures, hiding with clothing, behind furnishings, or in attics and wall voids. Young spiders take about one year to mature and the adults live about one year more. They prefer to remain in areas of low activity and are not aggressive, biting only when provoked or becoming trapped and threatened with harm.
These are light to dark brown spiders with very long legs and short hairs covering the legs and body segments. On the top of the cephalothorax there usually will be a darker pattern that strongly resembles a violin, giving this genus its common names of “violin” or “fiddleback”. However, many other spiders also have this vague pattern, and positive identification cannot be made based only on this character. The eyes of the brown recluse are very distinctive. There are 6 eyes arranged as 3 pairs in an arc across the front of the cephalothorax. No other spiders have this eye arrangement, and it can be seen easily with low magnification.
General cleanup of unnecessary debris outside will reduce harborage sites, and cleanup of clutter in garages or storage areas will reduce the numbers of spiders living on the interior. If invading spiders become a problem they can be prevented with an application of a residual pyrethroid insecticide around the building exterior and in likely pathways along walls on the inside. The use of glue traps can confirm the presence of the spiders, placed in attics or along wall-floor junctions. Dust formulations can be injected into walls or other voids the spiders may inhabit. Since structures can be re-infested from surrounding areas the habitat of this spider should be pushed as far away from the structure as possible. Heavy vegetation cover on the ground should be kept away from the structure, and all debris and materials on the soil that do not have to be there should be eliminated. Trees and shrubs that grow near the structure should be physically separated by pruning, and all cracks or other openings to the structure that can be repaired should be permanently sealed.
There are over 200 species of wolf spiders found north of Mexico, and these often are the most common spiders in cold climates of high mountains or far northern regions.
Wolf spiders are hunters, and use their silk only for lining a nest and for covering their eggs. The females create the tough egg sac and then carry it attached to the tip of the abdomen. Once the eggs hatch the mother then cuts a slit in the sac to allow her young to emerge, and they then climb onto her abdomen to be carried around for up to 2 weeks. Some species of wolf spiders may have leg s pans of 4 inches or more and they are very mobile, very fast, and very aggressive when threatened. They are capable of biting humans but the venom is not considered dangerous, but their aggressive behavior makes wolf spiders some of the most feared by people. Smaller species may even “run” across the water of a swimming pool, suspended on the surface tension of the water. Retreats for the spiders are holes in the soil, under debris on the ground or within wood piles. They commonly enter structures and can be found running across floors or walls as they search for food.
Wolf spiders vary in size from small species with only ½ inch leg spans to large ones whose legs may stretch out 5 inches. In general they are long legged and covered with short hairs, gray to brown to dark brown in color, and with several darker stripes running longitudinally on the cephalothorax. These body region is somewhat pear-shaped, with the front much narrower than the back and with the front, when viewed from the side, sitting higher than the back. However, the eyes are distinctive, with 8 ocelli arranged in the following manner. The “face” area is usually perpendicular, and the hind pair of ocelli sit at the top of the face, a very large pair of ocelli sit facing directly forward, and 4 smaller ocelli are in an arc below this enlarged pair.
There is little reason to kill these beneficial spiders, and those found inside should be captured alive and removed to the outside, where their activity as predators serves a benefit to the landscape. General cleanup of unnecessary debris outside will reduce harborage sites, and cleanup of clutter in garages or storage areas will reduce the numbers of spiders living on the interior. If invading spiders become a problem they can be prevented with an application of a residual pyrethroid insecticide around the building exterior and in likely pathways along walls on the inside.