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 (Patriot; OPtimizer)-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.
  • zeta-cypermethrin/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.

Injections, pour-ons, sprays

  • 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 pour-on (Clean-Up) 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.
  • essential plant oils (Essentria IC3) at 30 to 90 ml (1 to 3 oz) per gal mineral oil. Spray directly on animal in amounts to sufficiently cover. Avoid contacting teats with spray unless teats are washed and dried before milking.
  • 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/piperonyl butoxide pour-on (Ultra Boss) at 3 ml per 100 lb body weight. Maximum of 30 ml (1 fl oz) per animal. Treat again in 14 days.
  • permethrin spray (Gardstar 40% EC) at 118 ml (4 fl oz) per 50 gal water (0.05% ai). 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 till wet but not to runoff.
  • tetrachlorvinphos/ddvp (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. Do not treat calves under 6 months of age. Do not treat more often than once a day.

Dusts, backrubbers

  • permethrin backrubber or self-oiler (Gardstar 40% EC) at 118 ml/10 gal mineral oil or diesel oil. Keep rubbing device charged. Results improve with forced daily use.
  • 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.
  • zeta-cypermethrin/piperonyl butoxide dust (PYthon) at 2 oz per animal. 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.