CyLence Ultra® Insecticide Cattle Ear Tag (pyrethroid)

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CyLence Ultra® Insecticide Cattle Ear Tag (pyrethroid)

CyLence Ultra® insecticide cattle ear tag controls face flies, horn flies, Gulf Coast ticks and spinose ear ticks on cattle, including lactating dairy cattle. Flies are often an underestimated menace to cattle producers and can significantly impact the well-being and economic value of the herd. Flies interrupt grazing and can reduce weight gain. In fact, horn flies can reduce yearlings' weights by up to 18%.¹ Up to $68/head can be lost due to overpopulation of flies, and a total industry loss of $1 billion for the entire United States.² No producer wants to lose money, especially when there is a solution to the problem.²

Beyond economics, flies impact cattle comfort and health and cause:

  • Agitation 
  • Itching 
  • Disease Transmission

These impacts can reduce weight gain and milk production, making fly control ear tags an important part of a multiple-point-defense strategy.

Key Product Benefits:

  • Effective against face flies and pyrethroid-susceptible horn flies for up to five months.
  • Synergized fifth-generation pyrethroid insecticide beta-cyfluthrin.
  • Kills and repels face flies, a mechanical vector of Moraxella bovis bacteria which is a cause of pink eye in cattle. 
  • Can be used on beef and dairy cattle including lactating.
  • Utilizes the Allflex® Universal Total Tagger.

Package Sizes: 

  • One box contains two 10-tag pouches. 20 tags, 0.5 oz./tag.


  • All mature animals in the herd should be tagged.
  • For adequate control of horn flies, attach one tag per animal.
  • For optimal control of face flies, horn flies, Gulf Coast ticks and spinose ear ticks, attach one tag to each ear (two per animal). 

Important Product Information 

Learn more about how to properly apply, store and use CyLence Ultra Insecticide Cattle Ear Tags. See label for complete use guidelines, including all cautions and warnings. Always read, understand and follow the label and use directions.


CyLence Ultra Insecticide Cattle Ear Tags are for use on beef and dairy cattle, including lactating cows, to control face flies, horn flies, Gulf Coast ticks and spinose ear ticks.

Two producers overlook a beef health specialist pointing to a laptop screen.

1 Boxler, D. 2017. "Managing horn flies." University of Nebraska-Lincoln Beefwatch. Available at: Accessed December 5, 2017.

2 Simmons, N. June 2018. "Fly control is important for cattle herds over the summer.University of Florida Institute of Food and Agricultural Sciences Extension.