Learning Center

Spider Control in Carlsbad & Oceanside

Spiders and scorpions are common pests locally and they are actually beneficial in that they will make a meal of any insect that they can catch! They are often very difficult to control because they normally stay out of sight during the day and they try to avoid people. Nearly all spiders have fangs and venom but very few of them are dangerous to people. All scorpions have stingers, but there are no deadly scorpions common to San Diego. There are a dozen varieties of poisonous spiders in North County that can bite people, all of them are very eager to avoid contact with us and will very seldom bite unless they are forced to do so by direct physical contact.

Two basic types of spiders that we commonly find around north county homes are web spinners and huntersHunting spiders, sometimes called “wolf” spiders (pictured) scurry around, mostly at night, seeking a bug to jump on and eat. They do not use webs to capture their prey and they often have several eyes. The largest of the hunters is the Tarantula, often growing to fist size, and the smallest is a little “Wolf” spider about as big as the head of a pin. Spiders feed on each other and on other bugs that they can capture or overpower. Web spinners use their spinnerets to create bug traps and to make nests or egg sacs that they spin for their offspring. Their webs can be tunnels, trap doors, nets, tents, sacs, and intricate patterned orbs. Some of the webs are sticky, and others can be tough enough to use in gun sights!

Spiders in the house are very seldom a health or safety threat here in San Diego County, but they can be a real nuisance with their unsightly webs and their threatening demeanor. Spider bites usually happen when someone picks up some firewood or moves things around in a shed or garage. It is also quite possible to be bit in bed or putting on clothing with a spider inside.

Spiders come indoors to get something to eat and to escape inclement weather, the same as we do. It is not at all uncommon to find spiders indoors right after a fall rain or during a cold (or hot) spell, but the main thing that they are after is other arthropods (bugs). An exception to that is when you come across a male hunting spider seeking a mate! We often get calls about large hairy spiders scurrying around the floor during warm weather; these arachnid Lotharios have no interest in attacking anyone and they normally have shorter fangs and less venom than their female counterparts.

How to keep them out of the house? 1. Close the screen doors, 2. Make certain that there are no gaps around your doors and windows, 3. Keep the clutter and nesting sites to a minimum, 4. And try to cut back on their food supply (insects).

The first step to long term spider management is to eliminate the ants. That’s right, ants! You see, the primary food source for the early stages of development for most spiders is the ever present ant and the occasional tasty gnat or drain fly. From that, they graduate to larger bugs with each instar, or stage of development. Of course spiders also eat each other so, without a ready supply of ants, spiders will end up reducing their own population, often by more than ninety percent! A sac spider’s offspring that survives normally does so at the expense of several of its siblings. The following is a list of some of the local spiders that you may come across. Please understand that there is no comprehensive list of North County spiders.

Black Widow Spiders are very common here in North County. They appear around nearly all untreated structures from time to time. The female has a grape shaped body and she can grow, if well fed, as large as a grape. Her appearance is usually black and shiny with black legs also. Sometimes she can be a smoky brown, or even a mottled color. Her most distinctive feature is a dark orange hourglass shaped marking that is centered on the bottom of her abdomen. Immature or virgin black widows will often be lighter in color and might have that hourglass in a light orange shade. Her web is comprised of tough, sometimes sticky strands that are arranged in no particular pattern, but sometimes cover an area more than a yard wide! The male Black Widow is

about half the size of the female and much lighter in color. He is poisonous also but, like most spiders, his fangs are no match for the thickness of human skin. The light brown spider above is a Brown Widow. Notice that the hourglass is actually yellow or very pale orange. They are slightly smaller than the Black Widows and share many of their characteristics but their egg sacs are “spiky” looking.

Before the black widow male can mate with the female, he dances around her cautiously and ties her up with his web. When he is through with his “kinky” approach to love, he escapes while she gets untied. Where he gets in trouble, is when he comes back for another round! The female does not need to mate more than once, but she is always ready for a dinner date!

Brown Recluse Spiders have occasionally been brought into California but they do not reside in San Diego County. The Chilean Recluse, also known as the South American Violin Spider came into the Los Angeles area with some copper shipments in the late fifties and early sixties and is occasionally found in dry areas of San Bernardino along with the Desert Recluse, a less poisonous member of the Loxosceles family. The Recluse has a reputation that goes far beyond what it deserves; it is a shy spider that very seldom bites, even when crushed. An excellent study on this much maligned arachnid can be found at http://www.ipm.ucdavis.edu/PMG/PESTNOTES/pn7468.html

Yellow Sac Spiders are small, light colored hunters that have a racing stripe down their abdomen and are often found in our homes. You would find their egg sac near their nests in hideaway places, like behind pictures and paintings or between dressers and the wall. They come out at night and run across the walls and ceilings in search of food or a romantic tryst. These spiders can and do bite people when they get trapped in clothing or in bedding. Researchers at UC claim that yellow sac spiders are responsible for more bites on people than any other spider. They have four pairs of eyes and they move very quickly when they are disturbed. Check out this website if you would like more information about the Yellow sac spider. http://www.srv.net/~dkv/hobospider/yellosac.html

The best way to control spiders indoors is with a vacuum cleaner that has a hose nozzle. You should clean behind sofas, chairs, chests, and other furniture regularly and occasionally clean behind picture frames on the wall. Weather stripping will keep them from coming inside and you should inspect and replace the brush on the bottom of sliding glass doors when they are worn.

If You Live in North County, Contact Us For Spider Control.