David from Memphis, Tn writes
Talstar P (Talstar One) is NOT labeled to kill horse flies or for use in pastures containing grazing animals. We recommend using Martins Permethrin 10%. Martins Permethrin 10% controls horse flies, face flies, lice and ticks, with a residual activity lasting up to 28 days. It is also safe for Horses.
Answer last updated on: 03/28/2016