Livestock Entomology

2013 Horn Fly Data

The horn fly project has been an on going project that is conducted on an annual basis to see how different insecticidal ear tags perform from year to year. The following information is from the summer of 2013.

The horn fly project has been an on going project that is conducted on an annual basis to see how different insecticidal ear tags perform from year to year. The following information is from the summer of 2013.


Project details

This year we had two different locations that were tagged, Valliant OK and Stillwater OK. Fly counts are taken weekly from five groups of twenty cattle each. Three groups were treated with different insecticidal ear tags and one control group in Valliant OK. Stillwater had five different treated groups and one control group.

 

information to know before you buy ear tags

The following is information over horn fly insecticide resistance management and how to properly rotate tags each year.

 

  • Begin horn fly control procedures in the spring when cattle average approximately 200 horn flies.
  • If ear tags are used, the insecticide classes must be rotated. Do not use a pyrethroid ear tag more than once every three years. Do not use an organophosphate ear tag more than two years in succession. Continuous use of ear tags in the same insecticide class will eventually result in horn fly resistance.
  • Remove ear tags at the end of the fly season or when they lose their effectiveness. Do not tag cattle more than once per fly season, regardless of insecticide class.
  • If additional horn fly control is needed later in the year, use sprays, pour-ons, dusts or backrubbers. If possible, alternate insecticide classes when changing control methods.
  • If pyrethroid ear tags have failed to control horn flies in the previous year, pyrethroid insecticides in any form should not be used for at least two years. In the meantime, use non-pyrethroid ear tags, sprays, pour-ons, etc.
  • Pyrethroid Tags should be used NO more than once every three years
  • Organophosphate Tags should not use more than two years in a row
  • What animals should receive tags?

YES: Heifers, Cows and Weaned Calves

NO :  Calves still on their mother


Types of Insecticidal ear tags

The following are a list of insecticidal ear tags available on the market today.

 

Organophosphate EAR TAGS 

 


Pyrethroid EAR TAGS 

 
 

Abamectin EAR TAGS 

 
 

Ideal Rotation of Insecticidal Products for horn fly control

 

 The ideal rotation of products is based on the chemical class of the product. Currently all insecticides used for horn fly control fall in three categories: Pyrethriod, Organophosphate, or Macrocyclic Lactone.

 


The chemical class needs to be rotated every time the animals are treated. This could be a yearly rotation with insecticidal ear tags or a monthly rotation of sprays or pour-ons or any monthly combination.

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