Wellesley, MA - Spiders certainly evoke a fear with the general public & this no doubt is thanks to TV + movie sensationalism. Spiders are difficult to kill and easier to manage. They do not have the sticky pads (aerolia) on their feet that most insects have for absorbing insecticides from a surface. Therefore, it is better to landscape and use light management to discourage spiders. Spiders follow insects they prey upon for food and most flying insects come to white lights, but do not perceive yellow wavelengths of light. The use of yellow lights (AKA bug lights) will reduce the insect load upon which the spiders prey. Also, removing shrubs near a home or keeping them trimmed way back will help remove harborages for both spiders and insects.
Exclusion measures around your clients' homes will help to keep them out. EHS insect monitors (AKA glue boards) in a home will trap most spider species and allow for proper species identification thus better treatment strategies. Certainly, stressing the spiders by knocking down their webbing is also helpful toward discouraging their presence, something we perform on spider treatments. We also employ an all-natural product that prevents web formation on all spider treatments. This product can prevent web rebuilding for up to six months. As you can see, it is a multi-faceted treatment & strategy that has proven successful even against the giant ones that are hear to destroy earth!