Ortho Bug B Gon Insect Killer for Lawns & Gardens Ready to Spray1 kills 235 listed insects, including spiders, ants, fleas, ticks, mosquitoes, and Japanese beetles. One bottle treats up to 5, 300 sq. ft. and provides 6 months of protection*. Ortho Bug B Gon Insect Killer for Lawns & Gardens Ready to Spray1 is ready to use as soon as you get home, it starts to work immediately and is to kill or your money back. *Outdoors. Applies to spiders (excluding black widow, brown recluse, and hobo).