New World Screwworm Information

USDA is the lead federal agency. Their Screwworm.gov website collates most available information.

USDA APHIS: Pesticides for Control of New World Screwworm (Cochliomyia hominivorax)

States have FIFRA 2(ee) Bulletins available. Some include: Clean Up II; Cylence Pour On; Cylence Ultra Pest Control Concentrate; Cylence Ultra Premise Spray; Permectrin CDS Pour On; Permectrin Dust; Co-Ral Fly and Tick Spray; Elector PSP; Vapona

National Section 18 Authorized Treatments

  • Tanidil: A topical powder containing coumaphos and propoxur used to prevent or treat NWS infestations in animal wounds. Manufactured in Brazil, this product is imported, relabelled, and distributed by the USDA.
  • NovoFly: Genetically engineered, male-only New World screwworm strains used in the Sterile Insect Technique (SIT). The males are irradiated and sterilized prior to release to disrupt wild populations. [1, 2, 3, 4, 5]