Dairy cattle-Lice

Includes

Cattle chewing louse (Bovicola bovis)-biting
Little blue louse (Solenopotes capillatus)-sucking
Long-nose louse (Linognathus vituli)-sucking
Short-nose louse (Haematopinus eurysternus)-sucking

Management-chemical control

A single treatment may not give complete seasonal control because none of the listed products are effective against eggs. A second treatment no later than 14 days after the first treatment is usually recommended.

Ear tags

  • diazinon ear tag (OPtimizer)-Apply one tag to each ear of all animals older than 3 months. Do not use on lactating dairy cattle. Remove before slaughter.
  • diazinon/chlorpyrifos ear tag (Warrior)-Apply one tag per animal in late fall or early winter. Do not use on lactating dairy cattle. Remove before slaughter.
  • zetacypermethrin/piperonyl butoxide ear tag (Python MagnuM)-Apply one tag per head over 3 months of age in late fall or early winter. Remove at end of season or before slaughter.
  • zetacypermethrin/abamectin ear tag (Tri-Zap)-Apply one tag per ear of all animals. Remove at end of season or before slaughter.

Pour-ons, sprays

  • coumaphos spray (Co-Ral Fly & Tick Spray)-Mix 1 quart per 50 gal water. Spray to complete wetting to run-off. Treat no more than 6 times/year. Do not apply less than 10 days apart.
  • cyfluthrin pour-on (CyLence)-See label for dosing instructions. Pour along top of back and head of cattle of all ages. Repeat treatment 3 weeks later.
  • diflubenzuron/permethrin pour-on (Clean-Up II; Lice-Ban)-Apply at 3 ml per 100 lb of body weight up to 30 ml per animal. Apply down face and along back. Retreat as needed, but no more than once every 2 weeks.
  • octanoic acid/nonanoic acid/decanoic acid (Ecovet Fly Repellent)-Apply to hair coat with small sprayer or a cloth. (Not registered in Oregon.)
  • permethrin spray (Atroban 11% EC) at 1 quart to 50 gal water. Spray 1 to 2 quarts per animal and get thoroughly wet. Treat once every 2 weeks as needed.
  • permethrin spray (Durvet 10%; Prozap Insectrin X Concentrate)-Dilute 0.64 oz (normal infestation) or 1.28 oz (severe infestation) per gallon water (0.05%, 0.10%). Spray to thoroughly cover entire animal. Spray lactating cows only after milking is complete. Second treatment recommended in 14-21 days.
  • permethrin pour-on (Boss)-Apply at 3 ml per 100 lb body weight. Maximum of 30 ml (1 fl oz) per animal. Treat again in 14 days.
  • permethrin pour-on (Martin's 1%)-Pour along back line and down face at 0.5 oz per 100 lb body weight up to a maximum of 5 oz. Repeat as needed but don't exceed 5 oz during any 14 day interval.
  • permethrin spray (Gardstar 40% EC)-Dilute at 118 ml (4 fl oz) per 25 gal water (0.05% ai). Apply 1 to 2 quarts high pressure spray over body of animal; get thoroughly wet. For low-pressure spray, apply at 118 ml (4 fl oz) to 2.5 gal water; spray to point of runoff. Repeat application in 10-14 days.
  • permethrin RTU pour-on & spray (Gordon's)- Apply undiluted along back and down face at 0.5 to 2 fl oz per 100 lb to a maximum of 20 oz. Use as needed but no more than once every 2 weeks.
  • permethrin spray (Prozap Screw Worm Ear Tick Aerosol; Durvet Screw Worm Aerosol)-Apply to infested areas using a stiff brush to get spray to base of hair. Repeat every three weeks if required.
  • permethrin/piperonyl butoxide pour-on, spray (Synergized Delice)-Apply undiluted, 0.5 oz per 100 lb of animal to a maximum of 5 oz poured on along back and down face or applied using a mist sprayer. Two treatments at a 14 day interval are recommended.
  • permethrin/piperonyl butoxide pour-on (Ultra Boss)-Apply at 3 ml per 100 lb body weight. Maximum of 30 ml (1 fl oz) per animal. Two treatments at a 14 day interval are recommended.
  • pyrethrins spray (PyGanic Livestock & Poultry Insecticide)-Dilute at 1 qt per 16 gal water. Spray to thoroughly wet hair. Repeat treatment in 10 days. This organic product is OMRI listed.
  • pyrethrins spray (Evergreen Pyrethrum Concentrate)-Dilute at 1.5 oz per 2 gal water and spray to wet hair thoroughly. Repeat treatment in 10 days. This organic product is OMRI listed.
  • pyrethrins/piperonyl butoxide spray (Vampyre Misting Concentrate)-Dilute at 4.3 fl oz per gal water (for 0.10% pyrethrins) or 22 fl oz per gal water (for 0.50% pyrethrins). Spray thoroughly to wet side of animal. Repeat treatment in 10 days.
  • rosemary, peppermint oils spray (Essentria All Purpose)-Mix 30 to 90 ml (1 to 3 oz) per gal mineral oil. Spray directly on animal in amounts to sufficiently cover. Apply at least 20 minutes before milking of after milking is complete.
  • tetrachlorvinphos/ddvp spray (Ravap EC)-Mix 1 gal in 200 gal water. Apply as coarse spray, up to 0.5 gal per animal. Avoid contacting teats with spray unless teats are washed and dried before milking. Apply at least 20 minutes before milking or after milking is complete. Do not treat calves under 6 months of age. Do not treat more often than once a day.
  • thyme oil/2-phenethyl propionate/rosemary oil spray (EcoVia EC)-Dilute 0.5 to 1.5 oz per gal mineral oil USP. Spray to cover thoroughly. Repeat as necessary. Apply at least 20 min before milking or after milking is complete.

Backrubbers (oil)

  • permethrin backrubber/self-oiler (Gardstar 40% EC)-Mix 118 ml (4 oz) per 10 gal mineral oil or diesel oil. Keep rubbing device charged. Results improve with forced daily use.
  • permethrin backrubber/self-oiler (Synergized Delice)-Mix 1 pint per gal #2 diesel or mineral oil. Keep rubbing device charged.
  • permethrin backrubber/self-oiler (Gordon's)-Use undiluted. Recharge as needed.

Dusts

  • coumaphos dust (Co-Ral 1%)-Suspend bags where cattle congregate or pass through (e.g., milking parlor exit lane) daily. Place bags so they hang 4 to 6 inches below animals' backline. Direct applications of 2 oz per animal may be repeated no more frequently than 10 days apart and no more than 12 applications in 12 months.
  • permethrin dust (several brands, 0.25%)-Suspend bags where cattle congregate or pass through (e.g., exit alley of milking parlor). Place bags so they hang 4 to 6 inches below animals' backline. Direct applications of 2 oz per animal may be repeated as needed but no more than once every three days.
  • zetacypermethrin/piperonyl butoxide dust (PYthon)-Apply in dust bag, shaker, dusting glove, or mechanical duster, hung where cattle congregate or pass through (e.g., exit alley of milking parlor). Direct applications of 2 oz per animal may be repeated as needed but not more than once every 3 days.