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Mosquito-Borne Disease Prevention

Standing water, dusk chores and warm nights give mosquitoes plenty of chances. Reducing breeding sites and bites protects workers, families and animals.

Why do mosquitoes matter on a farm?

Mosquitoes breed in standing water, and farms have a lot of it: stock tanks, ponds, ditches, irrigation, tires, buckets and low spots. They are most active at certain times of day, which often match chore times. Some species can carry diseases to people and animals.

Which diseases appear, and when, depends on your region and the year. Your state or local health department publishes current information. Do not assume what is present or absent based on past years.

Dusk chores such as feeding, milking and closing up for the night often overlap with peak mosquito times. Consider whether a few tasks can be moved or whether protective clothing is the better choice.

• Standing water supports breeding
• Dawn and dusk are common times for bites
• Local risk changes by year and place

How do you reduce breeding sites?

Walk the farm and list water that stays for more than a few days. Empty containers, fix leaking troughs and taps, clean gutters, and improve drainage where practical. Refresh water in tanks and troughs on a schedule, and ask your extension office what suits your animals.

Some water cannot be removed, such as ponds and ditches. Ask your local mosquito control district or health department about options, and do not apply products unless you have confirmed the label and your state's rules.

Old tires, tarps with sagging pockets and gutters clogged with debris are classic breeding sites. A short checklist taped inside the shop door keeps them in view. Stagnant water in boot trays, flower pots, bird baths and pet dishes around the house also breeds mosquitoes, so include the home yard in your spring walk-through, and check again after each heavy rain.

• Empty or cover unused containers
• Fix leaks and drainage problems
• Refresh trough water regularly
• Ask the local district about permanent water

How can workers avoid bites?

Cover skin when practical, especially at dawn and dusk. Use repellents registered by the EPA and follow the label. The CDC explains how to choose among them and how to use them with sunscreen. Ask a pharmacist or provider for advice for children and pregnant people.

Fix screens on windows and doors on houses, bunkhouses and break rooms. Provide repellent at central points and remind workers to use it.

Choose repellent products by reading the label and the EPA guidance. Check that the product is intended for the use you have in mind and follow all directions.

What symptoms should prompt a call to a provider?

Fever, severe headache, stiff neck, rash, joint pain or confusion after mosquito exposure should be taken seriously. Contact a health care provider and mention the exposure. Call 911 for severe symptoms such as confusion, seizures or trouble breathing.

Do not wait to see if symptoms pass if they are severe. The CDC and your health department describe signs of specific diseases in detail.

If you work in areas where disease activity has been reported, ask your health provider what to watch for. Keep a list of workers who have symptoms and encourage them to rest and get checked. Pay attention to horses and to people who work in the evening. Keep a list of local symptoms the health department asks people to report, and follow its directions about testing and follow-up care.

What about horses and other animals?

Some mosquito-borne diseases affect horses and other animals. Ask your veterinarian about vaccines and prevention in your area, and about signs to watch for. Report suspicious illness to your veterinarian promptly, since some conditions must be reported to state officials.

Your veterinarian can also advise about reducing exposure at times of day when animals are most affected.

How do you stay informed and prepared?

Sign up for alerts from your local health department and mosquito control district. Pay attention to local reports of mosquito activity and disease. Review your breeding site list each spring and after heavy rain, which creates new standing water.

Share information with neighbors and workers. Mosquitoes do not stop at property lines, and prevention works best when a whole community takes part.

Check on neighbors who may have difficulty managing standing water, such as older residents, and share what you have learned.

Last reviewed: November 12, 2026. Written by the Farm Safety Editorial Team. See our editorial policy.