• Improve drainage of livestock trampled areas and manure piles to reduce water accumulation
• Turn over buckets, pails and feeders when not in use to prevent water accumulation
• Drain and fill water troughs weekly or add goldfish or koi to eat mosquito larvae or use mosquito dunks
• Fix leaky faucets around barns or stables
• Cover and store hay away from sources of water
• Talk to your veterinarian about immunizing horses against West Nile virus
• Consult a licensed pest control operator for mosquito habitat that cannot be controlled by drainage or other means
• West Nile Virus: Protecting Your Horses (PDF)

NOTE: If you are considering using a pesticide to control mosquitoes, please see the legal requirements.