Flies Be Gone Fly Trap Kills Up To 20000 Flies Per Bag, This would be perfect near a stock yard, stable, or areas where you have a lot of flies congregating. Just make sure that it is hung far enough away from your animals and front door where it is not going to bring in hoards of flies that initially smell the bait and fly to the area.
The good: It kills flies. By the thousands (obviously this claim requires that there are thousands of flies w/in flying distance of your trap).
Ths bad: It stinks and if you don't replace it often enough you can end up creating more flies.

Flies Be Gone Fly Trap Kills Up To 20000 Flies Per Bag

by FLIES BE GONE

Product Features

NO toxins, NO poisons, NO insecticides
Catches up to 20,000 flies in each trap
Maintenance free and completely disposable
Highly effective even on fruit flies

Product Description

18 billion flies can't be wrong! Flies Be Gone Fly Trap really works, safe and easy! Proven by U.S. Military use in Iraq, proven in livestock corrals, kennels, restaurant trash areas... this reduces fly problems without toxic chemicals, maintenance or messy clean-ups. It's been working for over 25 years in 27 countries worldwide. You just pour the included bait inside and add water, and the bait remains active for about 30 days. Flies fly in and never get out, and it decimates the breeding population. Protects an area about half the size of a football field. For outdoor use only. Environmentally safe and disposable. Hang-up bag is approx. 8" diam., 11"h. Institute your own "no fly" policy... get this best in pest control now! Flies Be Gone Fly Trap