link is UK ag dept's take on spiders. brown recluse
look at the pic in the link quote:
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following measures can be used to control all spiders:
Routine, thorough house cleaning is the best way to eliminate spiders and discourage their return. A vacuum cleaner or broom effectively removes spiders, webs, and egg sacs.
Spiders prefer quiet, undisturbed areas such as closets, garages, basements, and attics. Reducing clutter in these areas makes them less attractive to spiders.
Large numbers of spiders often congregate outdoors around the perimeter of structures. Migration indoors can be reduced by moving firewood, building materials, and debris away from the foundation. Shrubs, vines and tree limbs should be clipped back from the side of the building.
Install tight-fitting window screens and door sweeps to exclude spiders and other insects. Inspect and clean behind outdoor window shutters.
Consider installing yellow or sodium vapor light bulbs at outside entrances. These lights are less attractive than incandescent bulbs to night-flying insects which, in turn, attract spiders.
To further reduce spider entry from outside, insecticides can be applied as a "barrier treatment" around the base of the foundation. Pay particular attention to door thresholds, garage and crawl space entrances, including foundation vents. Carbaryl, bendiocarb, chlorpyrifos, or any of the synthetic pyrethroids (e.g., cypermethrin, cyfluthrin, lambda-cyhalothrin) are effective, but may need to be reapplied periodically throughout the summer. Wettable powder or microencapsulated ("slow-release") formulations are most effective.
The brown recluse may be found living indoors or outdoors, while black widows are more often encountered outdoors. Thorough inspection of cracks, corners, and other dark, undisturbed areas with a bright flashlight will help determine the location and extent of infestation. Both species construct irregular, nondescript webs. Indoors, pay particular attention to basements, attics, crawl spaces, closets, under/behind beds and furniture, inside shoes, boxes of stored items, and between hanging clothing. Brown recluse spiders also may be found living in drop ceilings, behind baseboards, and inside ductwork or registers. Another way to detect infestations in these areas is to install glueboards or sticky traps. These devices can be purchased at grocery or farm supply stores. Placed flush along walls and in corners, glueboards and sticky traps will capture large numbers of spiders.
Brown recluse and black widow spiders also live outdoors in barns, utility sheds, woodpiles, and underneath lumber, rocks, and accumulated debris. To avoid being bitten, wear work gloves when inspecting inside boxes or when moving stored items.
Each of the six management tips noted above for spiders in general are also useful against the black widow and brown recluse. Removal of unnecessary clutter is especially helpful in making areas unattractive to these pests. Indoor infestations of brown recluse and black widow also warrant treatment with insecticides. Insecticides should be applied into areas where spiders are living, making an attempt to contact as many spiders and webs as possible with the spray. Spot treatment with synthetic pyrethroids such as cyfluthrin, sypermethrin, or lambda-cyhalothrin are especially effective. Most household insecticides with spiders listed on the label will also kill spiders provided the spider is treated directly. In inaccessible or cluttered areas such as attics and storage sheds, total-release foggers or aerosols containing synergized pyrethrin or synergized pyrethroids (e.g. resmethrin, sumithrin, cyfluthrin) will have a better chance of contacting spiders that are hidden.
Severe infestations of brown recluse or black widow spiders require specialized skills and equipment to eradicate. In these situations, it would be prudent to call a professional pest control operator.