StridAst
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actually, most death's from black widow bites are caused by allergy. While the venom from all spiders in the genus Latrodectus is extremely toxic (Think nerve agent. Atropine will even counteract some of the effects) They also inject a truly tiny amount of the venom. A small child can die from a single rather nasty bite, but the vast majority of the bites are from allergic reaction.
That being said, Latrodectus spiders do kill more humans then any other spider. Largely due to being present on every continent except for Antarctica. Although human deaths from bee stings are still considerably more common. As an allergy could exist to either one equally frequently, and bee stings are considerably more common.
Here in North America there are 3 spiders slightly nastier from a single bite then Latrodectus. The most well known is the Brown Recluse (usually a term applied to all spiders of the genus Loxosceles). However in the pacific northwest over to Montana and down into Utah there are the Hobo Spiders, and Yellow Sac spiders are all over North America. All three of these spider types are known to produce necrotic lesions. With the majority of the bites stemming from yellow sac spider bites. The bites of all 3 spiders are routinely diagnosed as "Brown Recluse spider bites" regardless of where you live, and if there are even brown recluse spiders present.
Now in the united states, these are the only known medically significant spiders known to continuously inhabit a range still. As for frying one with a laser, a black widow would die easily to any color laser, as long as you had multiple watts Although if using a red or IR laser, watch out for reflections if you hit one of its red spots...... a yellow sac spider, being a pale yellow color would just get mad and run around, although a BR laser might have better luck, they aren't available in high enough powers. While normally non aggressive, this might get it to change it's mind. A brown recluse or hobo spider, might take some more damage but would still be likely to just get mad. Last thing anyone would want hiding in their bedroom is a blind, hurt, and very mad somewhat toxic spider from any one of these genus.
As for other countries. Most of the nastiest spiders in the world are considerably larger. The wattage of laser needed to kill a Sydney Funnelweb for instance would be rather high. As they are the side of a small bird. Not to mention who would want to risk pissing one off. I would recommend if you wish to use a laser to kill spiders, borrow the Death Star and simply blow up the entire planet. After all, anything short of it simply leaves a vacuum of no predators in their niche. So in would move new spiders to take their place.
Glue boards will catch and trap lots of spiders quite well, pesticides will work too.
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