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Question DetailsAsked on 6/4/2013

How do you kill black widow spiders?

Our landscaper told us we have black widow spiders in our plantbed between the circular driveway and the street. I read that spraying doesn't do any good because they mostly stay hidden during the day and their feet are too small to absorb the spray if they walk on it. The pest control company I called said it would be a waste of my money to have them come out. How do you get rid of them?

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There are specific extermination chemicals for this class of spiders - Demand CS is one of them, and there are several others. The most effective means tends to be wetted powder sprays on surfaces they are likely to walk or web on, so the the powder kills them at that time. Black widows are hard to control because the eggs can stay viable up to several years, so while one spraying might kill the current spiders, another generation hatches out later. This necessitates repeated applicstions about every 6 months for as much as several years, and of course if you have a problem in the general neighborhood (as opposed to ones imported into your house in a household move, for instance) then you are looking at periodic tretments forever.

You need to find a local exterminator who is experienced with spider control. Also, vacuuming (and immediately disposing of vacumn bag, as eggs can hatch in the bag) all nooks and crannies and all exposed floor joists and eave areas, closing off wall and foundation openings with foam, and eliminating woodpiles, old tires, debris piles, etc near the house can all reduce their habitat.

Answered 7 years ago by LCD

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