Fig. 3.--Narrow strip of hardened bait (1g grams Bayer L 13/59 in 1 pint 
Karo syrup) in south part of H-shaped calf barn. Two months after being 
applied, the bait was still effective. House flies on floor represent the kill from 
this strip in less than a day. North part of H-shaped barn was unbaited, and 
flies breeding there had free access to south part. 
