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Screwworm Alert
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Screworms
Posted on: June 22, 2026 by Jemila Chellappa
⚠️ LIVESTOCK ALERT: New World Screwworm Expanding
New World Screwworm (NWS), Cochliomyia hominivorax, is a devastating livestock pest whose larvae (maggots) feed on the living tissue of warm-blooded animals. NWS was eradicated from the United States in 1966, but recent outbreaks have spread northward through Central America and into Mexico, raising concerns for the U.S. livestock industry.
Why This Matters
Historically, New World Screwworm cost the U.S. livestock industry more than $100 million annually before eradication. Infestations can cause severe animal welfare issues, production losses, trade restrictions, and costly eradication efforts.
While NWS has not been detected in Idaho, producers should remain vigilant and aware of the signs and symptoms. Current Status: https://www.aphis.usda.gov/animals/animal-health/livestock-and-poultry-disease/current-status?page=1
Animals at Risk
- Cattle
- Sheep and goats
- Horses
- Swine
- Wildlife
- Pets
- Any warm-blooded animal, including humans
What to Look For
Inspect animals regularly and watch for:
• Maggots present in wounds
• Wounds that enlarge rapidly or fail to heal
• Foul-smelling discharge or odor of decay
• Excessive irritation or unusual behavior
• Head shaking or rubbing
• Animals separating themselves from the herd
• Reduced appetite or depression
Even small wounds, including tick bites, ear tags, branding sites, castration wounds, dehorning sites, foot lesions, and newborn umbilical cords can attract NWS flies.
What do you need to know? https://www.aphis.usda.gov/animals/animal-health/livestock-and-poultry-disease/stop-screwworm#comp-32826
Prevention
✅ Promptly treat and monitor all wounds.
✅ Reduce unnecessary procedures that create wounds during peak fly activity.
✅ Inspect livestock frequently during warm weather.
✅ Repair equipment, corrals, and fencing that may cause injuries.
✅ Work closely with your veterinarian regarding wound management and fly control.
If You Suspect New World Screwworm
Immediately contact:
- Your veterinarian
- Idaho State Department of Agriculture (ISDA)
- USDA Animal and Plant Health Inspection Service (APHIS)
Early detection and rapid reporting are essential for preventing establishment and spread.
Idaho Producers: Stay Prepared
Although New World Screwworm remains a southern concern, livestock movement, wildlife, pets, and travel can contribute to its spread. Increased awareness and monitoring today can help protect Idaho's livestock industry tomorrow.
For the latest updates and current detections, visit the USDA APHIS Screwworm Status Page.
Parma 2026 Field Day
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Field Day at Parma on August 13th, 2026
Posted on: June 22, 2026 by Jemila Chellappa
2026 Snake River Weed Management Tour and Field Day at Kimberly, ID
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Posted on: June 12, 2026 by Nora Olsen
Please save the dates for the 2026 Snake River Weed Management Tour and Field Day:
Wednesday, June 24th - UI Kimberly Research and Extension Center, 3806 N 3600 E, Kimberly, ID 83341
Registration: 8:00 to 9:00 AM
Tour: 9 AM to noon
Followed by a sponsored lunch.
Please see the attached flyer for details.
You do not need to pre-register/ RSVP
We anticipate that three Idaho pesticide recertification credits will be available after the tour.
See the attached flyer for more information.
For questions about the tour, please contact:
Albert Adjesiwor
Ph: 2084236616
OR
Angela Jackson
amjackson@uidaho.edu
208-423-6606
