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Screw Worm Aerosol

This page contains information on Screw Worm Aerosol for veterinary use.
The information provided typically includes the following:
  • Screw Worm Aerosol Indications
  • Warnings and cautions for Screw Worm Aerosol
  • Direction and dosage information for Screw Worm Aerosol

Screw Worm Aerosol

This treatment applies to the following species:
Manufacturer: Aspen

Wound Spray

For Use On: Beef and Dairy Cattle, Sheep, Goats, Swine and Horses.

Kills flies and fly maggots on wounds.

EPA Reg. No. 47000-100-40940

EPA Est. No. 47000-IA-1

Screw Worm Aerosol Caution

Keep Out Of Reach Of Children

Active Ingredients







*(3-phenoxyphenyl)methyl (±) cis/trans-3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropanecarboxylate. Cis/trans ratio: Min. 35% (±) cis and max. 65% (±) trans.

Precautionary Statements


Harmful if swallowed, absorbed through the skin, or inhaled. Causes moderate eye irritation. Avoid breathing spray mist. Avoid contact with skin, eyes, or clothing. Wash thoroughly with soap and water after handling and before smoking or eating. Remove contaminated clothing and wash before reuse. Avoid contamination of feed and foodstuffs.

Environmental Hazards

This product is extremely toxic to fish and aquatic invertebrates (crabs, shrimp). Do not apply directly to water.

Physical Or Chemical Hazards

Contents under pressure. Do not use or store near heat or open flame. Do not puncture or incinerate container. Exposure to temperatures above 130° F may cause bursting.

First Aid

If Inhaled: Move person to fresh air. If person is not breathing, call 911 or an ambulance, then give artificial respiration, preferably mouth to mouth if possible. Call a poison control center or doctor for further treatment advice.

If Swallowed: Call a poison control center or doctor immediately for treatment advice. Have person sip a glass or water if able to swallow. Do not induce vomiting unless told to do so by a poison control center or doctor. Do not give anything by mouth to an unconscious person.

If in Eyes: Hold eye open and rinse slowly and gently with water for 15-20 minutes. Remove contact lenses, if present, after first 15 minutes, then continue rinsing eye. Call a poison control center or doctor for treatment advice.

If on Skin or Clothing: Take off contaminated clothing. Rinse skin immediately with plenty of water for 15-20 minutes. Call a poison control center or doctor for treatment advice.

For emergency information contact: National Pesticide Information Center at 1.800.858.7378 between 6:30 am and 4:30 Pacific Time. After 4:30 call your poison control center. Have the product container or label with you when calling a poison control center or doctor, or going for treatment.

Directions For Use

It is a violation of federal law to use this product in a manner inconsistent with its labeling.

SHAKE WELL BEFORE USING: Remove protective cap, hold container upright and spray from a distance of 12 to 15 inches. Remove birds and cover fish aquariums before spraying.

IN ANIMAL QUARTERS AND MILK ROOMS: For rapid control of House Flies, Mosquitoes, Gnats, Wasps, Hornets, Bees and Small-Flying Moths. Remove animals prior to treatment, close windows and doors and spray at the rate of 2 seconds per 1000 cubic feet of space. For best results, keep area closed for 10 minutes after spraying. Do not remain in treated area and ventilate after treatment is completed.

TO TREAT LIVESTOCK: To protect beef cattle, dairy cattle, goats, sheep, hogs and horses from attacks of Stable Flies, Horse Flies, Deer Flies, Face Flies, House Flies, Horn Flies, Mosquitoes, and Gnats: Spray about 3 seconds on each side being careful to spray back, withers and forelegs thoroughly. To protect from Face Flies, spray the face and head, but do not spray into the eyes. Repeat treatment when flies are troublesome. For ear ticks spray directly into ear.

WOUND SPRAY AND TO KILL SCREW WORMS, FLIES AND MAGGOTS infesting beef cattle, horses and sheep, hold can about 4 to 8 inches from the area to be treated with nozzle pointed at wound. Spray the area until it is completely wet (3 to 10 seconds are usually enough). The area surrounding the wound should also be sprayed. This product is not recommended for use in deep wounds. Some strains of screw worm may develop resistance to pyrethroids. This will be observed by lack of response to treatment. Where pyrethroid resistance is known or suspected, this product should not be used.

FOR SWINE: Do not ship animals for slaughter within 5 days of last treatment.

TO CONTROL BLOOD SUCKING LICE: Apply to the infested areas of the animal, using a stiff brush to get the spray to the base of the hair. Repeat every 3 weeks if required.

TO CONTROL POULTRY LICE: Spray roosts, walls and nests or the cages thoroughly. This should be followed by spraying over the birds with a fine mist.

TO CONTROL BEDBUGS AND MITES IN POULTRY HOUSES: Spray crevices of roost poles, cracks in walls, and cracks in nests where bedbugs and mites hide.

STORAGE AND DISPOSAL: Contents under pressure. Do not use or store near heat or open flame. Do not puncture or incinerate container. If empty: Place in trash or offer for recycling if available. If partly filled: Call your local solid waste agency for disposal instructions.

NOTICE: Buyer assumes all responsibility for safety and use not in accordance with directions.

Manufactured for: Aspen Veterinary Resources,® Ltd., 3155 W. Heartland Dr. Liberty, MO 64068



12 oz.

A246CT Rev. 7-12

NAC No.: 14752780

Telephone:   816-415-4324
Fax:   816-415-4314
Every effort has been made to ensure the accuracy of the Screw Worm Aerosol information published above. However, it remains the responsibility of the readers to familiarize themselves with the product information contained on the US product label or package insert.

Copyright © 2017 North American Compendiums. Updated: 2017-04-21