Tracey Erickson SDSU Extension Dairy Field Specialist Fly control in dairies is a challenge, due to abundant moisture and organic matter available for fly breeding grounds. Flies not only are a pest, but they also decrease production efficiency. Flies cause livestock to expend extra energy fending them off instead of resting, feeding and milking. Other issues directly associated with fly pest problems on dairies include increased medication costs, veterinary costs, increased potential for…