Ortho Bug B Gon Insect Killer for Lawns and Gardens Concentrate kills 235 listed insects, including spiders, ants, fleas, ticks, mosquitoes, and Japanese beetles. 1 bottle makes up to 42 Gal. and kills up to 6-month outdoors. The product starts to kill within minutes and satisfaction is guaranteed or your money back. Applies to: Spiders (excluding black widow, brown recluse, and hobo).