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Spider Control Facts
Have Arachnophobia? Contrary to the 1990 Steven Spielberg movie made popular by John Goodman as the "Exterminator" and Jeff Daniels as the "Doctor" most spiders are harmless. The only distinguishable feature is that Spiders have a characteristic appearance which is easily recognized by most people. They possess eight legs which immediately separate them from insects, which have only six legs. Spiders lack wings and antennae. Their bodies have but two regions - a cephalothorax (fused head and thorax) and an abdomen. Young spiders, or spiderlings, resemble the adults except for size and, sometimes, coloration. All spiders have a pair of jaw-like structures, called chelicerae. At the end of each is a hollow, claw-like fang. Each fang has a small opening in the end through which venom is injected into the prey. Spinnerets, located at the tip end of the abdomen, are silk spinning glands used for web making.
Many species of spiders are common household pests in the United States. Certain common household spiders spin webs over lamps, in corners and in basements. This creates an unsightly situation but causes no real harm. Remember that every "cobweb" was made by a spider. Although all spiders use venom when they bite and kill their prey, the black widow and the brown recluse spiders are the only North American species consistently dangerous to humans. Even though there is generally little danger of complications from spider bites, you should advise all spider bite victims to take the spider specimen with them (if possible) when consulting their physician.
Under most conditions outdoors, spiders are considered beneficial because they feed on insects. However, they are undesirable to most homeowners when indoors, and the unsightly webbing spiders use to catch insect prey usually outweigh this beneficial behavior.
Many spiders are associated with moisture and, therefore, are found in basements, crawl spaces, and other damp parts of buildings. Others live in warm, dry places so are found in sub floor air-vents, in upper corners of rooms or in attics. Most species hide in cracks, darkened areas, or other retreats which they construct of silk.
Poisonous Spiders
Black Widow Spider / Brown Widow SpidersThe black and brown widows are widely distributed over the warmer portions of the United States. Females are easily identified because of their globular, shiny black or brown abdomen with two reddish or yellowish triangles on the underside. These reddish or yellowish triangles form a characteristic hourglass marking. The abdomen is about 1/4 inch in diameter but may be as large as 1/2 inch when the female is full of eggs. Males are much smaller and lighter-colored, with light streaks on their abdomens.
Left - Female Black Widow Spider Right - Brown Widow
Brown Widow w/Multicolored Top
The widow's web is an irregular mass of fibers with a small central area to which the spider retreats while waiting until its prey becomes ensnared. These webs are frequently constructed underneath boards, stones, or the seats of outdoor privies. They are also found along foundation slabs, behind shrubs and especially where brick or wood siding extends close to ground level. This spider does not usually enter residences.
Widow spider venom contains toxins that are neurotoxic (affects the nervous system). The severity of a person's reaction to the bite depends on the area of the body where the bite occurs; the person's size and general sensitivity; the amount of venom injected; depth of bite; seasonal changes (in venom potency); and temperature. The bite produces a sharp pain similar to a needle puncture. The pain usually disappears rapidly. Local muscular cramps are felt 15 minutes to several hours after the bite, spreading and becoming more severe as time passes. The venom then grows weak, tremors develop, and the abdominal muscles show a board-like rigidity. Respiration becomes spasmodic and the patient is restless and anxious. During this period, a feeble pulse, cold skin, labored breathing and speech, light stupor, and delirium may be noted. Convulsions and death may result with some victims, especially if the person is sensitive to the venom and no treatment is received. An anti-venom specific for the black or brown widow is readily available to most physicians.
The brown recluse spider, (loxosceles reclusa), can also inflict a very dangerous bite. The initial pain associated with the bite is not intense, and is generally less troublesome than a bee sting. Within 8 to 12 hours the pain becomes quite intense, and over a period of a few days a large ulcerous sore forms. This sore heals very slowly and often leaves a large, ugly disfiguring scar.
Brown Recluse Bite and Infection
Warning - Pictures Are Graphic !
Subject Unknown - Infection Time 6-8 weeks.
Click On Each For A Larger Image
The brown recluse is soft-bodied and secretive species found in homes and other outbuildings. The adult body varies from 1/3- to 1/2inch in length, with the arrangement of the legs producing a larger overall size of 1 inch diameter or greater. The body is yellow to dark brown, and has a rather distinctive darker brown violin shaped mark on the top of the cephalothorax. Recluse Spiders are often colored tan, but can be dark brown to almost white in appearance.
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Brown Recluse Spider Click For Larger ImageThe Brown Recluse Spider has been widely reported in the southern, western, and mid western United States, and is a particularly serious pest in Oklahoma, Missouri, and surrounding states. It is usually found indoors, particularly in bathrooms, bedrooms, closets, garages, basements, and cellars. In homes with forced hot-air heating and air conditioning and often above-ceiling ductwork, brown recluse spiders are commonly found harboring in or around the ductwork or registers. They may also be present in attic areas or other locations above the ceiling. They are also commonly found in cluttered closets or basements, and in outbuildings where miscellaneous items are stored. The web is not elaborate and is best described as an off white to gray, nondescript type of webbing. The spider is not aggressive and usually retreats to cover when disturbed. Most bites occur when a person crushes the spider while putting on old clothes that have been hanging in a garage, or by rolling on the spider while asleep in bed.
The best method of treatment for Brown Recluse Spiders is to first carefully inspect all areas (using leather gloves and flashlight) that are suspected of harboring them. The BugBuster Vacuum is perfect for capturing them during an inspection or even for collection purposes. Then after careful inspection, treat all areas with a wettable powder insecticide such as Demon WP. Baseboards, corners of rooms, closets, under and behind furniture, window sills, etc, should all be carefully treated. Attics and sub areas can be treated or dusted with TriDie. BioCare Spider Traps, Trapper LTD glue traps or Insect stick alls can also be used to trap Brown Recluse and monitor movement and population numbers.
As previously mentioned the Brown Recluse Spider is usually found indoors, especially in bathrooms, bedrooms, closets, garages, basements, and cellars. They may also be present in attic areas, or other locations above the ceiling. They may also be found in out-buildings. Their web is not very elaborate and is best described as an off-white to gray, nondescript webbing. Most bites occur when a person crushes the spider while putting on clothes that may have been hanging for some time, or by rolling on the spider while asleep in bed. Gardeners should wear gloves and be especially alert when handling leaves or bark mulch.
Non Poisonous SpidersTarantula's, Jumping Spiders, Wolf Spiders and Garden Spiders are victims of a so-called spider phobia and are considered to be armed and dangerous simply because the possess the same spider shape and characteristics as the brown recluse and black widow. They are hairy, large and formidable, but their bite is less harmful than a bee sting. Some people, however, are extremely allergic to spider venom, so if you are bitten and have an adverse reaction, don't hesitate to see your physician immediately.
TarantulaMany people have tarantula's as pets. Although this may sound fun to some people, tarantula's although shy and timid most of the time will bite if angry or provoked.
TarantulaThe garden spider is sometimes called a yellow sac spider - although the yellow sac spider is a completely different species. The garden spider weaves a beautiful web and is the best looking of all the spiders.
Garden SpiderWe're not sure that the wolf spider looks like a wolf.
Wolf SpiderThe hunting spider hunts for insects, not people.
Hunting SpiderJumping spiders can jump, as most spiders can, although nobody is for sure how far or high.
Jumping SpiderDaddy Long Legs
Daddy Longlegs are not true spiders. They are spider like arachnids, belonging to the same class (arachnid) as spiders, ticks, scorpions, and mites. Daddy Longlegs, also known as Harvest Spiders, belong to a different order than spiders, that of Opilliones. Spiders belong to the order Araneae. The daddy long legs get it's name because their legs can grow to be over 12" long. (April Bailey)
Daddy Long LegsSpider Control
If spiders are breeding indoors or if outdoor species are migrating indoors, residual insecticide applications of Demand or Demon WP can be used. All areas where the spiders have been found should be treated, paying particular attention to dark corners of rooms and under furniture. Dusts such as or Drione or TriDie may be especially useful for treating crawl spaces and attics. Wettable powder or microencapsulated formulations such as Demand or Demon WP will generally give somewhat better and longer residual action on most surfaces. The use of glue type traps such as the BioCare Spider Traps or Trapper LTD indoors works well to trap spiders behind furniture, under beds, in closets, etc.
Outdoor treatment is necessary to control spiders which are migrating inside or to eliminate spiders on porches, under eaves, and other areas on the outside of the building. Spiders often become particularly numerous on the exterior surfaces of homes and buildings built near lakes. They spin webs to catch and feed on the many flying insects which come out of the lake.
Chronic spider problems can be very difficult to manage as there are few good management options except reducing night lights (which attract so many flying insects) and applying residual insecticide treatments at every few weeks. Dr. T's Cobweb Eliminator works well around boat docks, eaves, etc. to stop spiders from spinning their webs. Spider fecal droppings can disfigure fiberglass boats or latex painted surfaces. Occasionally, residual treatments using a long lasting insecticide is necessary to eliminate heavy infestations. The residual insecticides such as Demand or Demon WP can be used indoors as well as outdoors..
The Webduster can be used to remove spider webs from eaves, doorways, window sills, corner of rooms, garages, etc. It is the perfect companion when using Dr. T's Cobweb Eliminator. When removing spider webs it is important to remember to also remove and destroy the egg sacs. It may be a better idea in some cases to spray the area (eaves) with a residual insecticide first to kill the spiders and also the eggs, let the area dry, and then remove the webs and egg sacs. Whatever method you prefer, be sure to not disrupt live spiders to the point where the jump or lunge at you during your web removal process. Protective clothing and eye protection is also recommended to help protect against spider bites and exposure to the products being applied overhead which can result in drift.
Cobweb Removal Using The Webduster
Recommended Products:Indoors - Liquid sprays such as Demand or Demon WP. Spiders must be killed by spraying directly on contact. Residual sprays are ineffective since spiders do not absorb chemicals through their feet or legs as cockroaches do. Dust formulations such as Drione or TriDie are very effective in attic areas and basement areas.
BioCare Spider Traps, Insect Stick all's, Trapper LTD's - Place Stick all's under and behind furniture to trap, catch and monitor spider infestations, especially infestations of Brown Recluse and Black Widow Spiders.
Vacuuming using the BugBuster Vacuum and removal of webs and egg sacs. Removal of clutter and other sanitation steps directed at conditions favoring spiders and insect populations.
Cobweb removal using the Webduster.Outdoors - Liquid broadcast spray such as Demand or Demon WP. Cobweb removal using the Webduster and Dr. T's Cobweb Eliminator works great on Boat Docks and homes and buildings located near lakes and other spidery areas. Dr. T's Cobweb Eliminator is a natural product that prevents spiders from spinning webs.
Want To Know More? Get The Book!

Field Guide For The Management of Urban Spiders
220 Pages Author: Stoy Hedges
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