Dairy Cattle Pests

Jenifer Cruickshank
Latest revision: 
March 2023

In all cases, follow the instructions on the pesticide label. The PNW Insect Management Handbook has no legal status, whereas the pesticide label is a legal document. Read the product label before making any pesticide applications.

Note: Products are listed in alphabetical order and not in order of preference or superiority of pest control.


  1. Materials suggested for use on dairy cattle may also be used on beef cattle.
  2. Materials listed below are approved for use in all dairy cattle, including lactating animals, unless otherwise noted.
  3. For non-lactating cattle, additional options may be found in the Beef Cattle Pests section, but carefully observe restrictions preceding lactation.
  4. Some products may have a meat withdrawal period.
  5. Ideally, apply chemical control after milking, but always take particular care to wash and dry teats thoroughly before milking.
  6. When using backrubbers or dust bags to dispense product, place the backrubber or bag where cattle will congregate or pass through regularly, such as the exit alley from the milking parlor. Be sure to refill/recharge/resaturate as needed.
  7. For many ear tags, “optimum” control is provided by two tags per animal; “adequate” control is provided by one tag per animal.
  8. Some of the products suggested for insect control are registered as drugs, not insecticides, and are regulated by the FDA.
  9. Piperonyl butoxide is a synergist (ingredient that makes the insecticide more effective).