Aug 19, 2013 - 10:27 AM
Almost any pesticide product will kill Black Widow Spiders. Outdoors, use Bifen or Talstar, and completely wet the entire lawn, under shrubs, debris, etc. The application rate is roughly 1 gallon per 1,000 square feet of lawn mixed at 1 oz of chemical per gallon of water.
Applications may be need to be performed every weeks during the spring, summer and fall for maximum control.
Indoor use ePest IPM Traps placed under and behind furniture to catch them.
Hope this helps.