OPtimizer PYthon Warrior PYthon Maxima Brute for Horses Brute for Cattle



AGRESSOR™ is a plastic ear tag containing a new, synergised formulation of abamectin (avermectins B1a and B1b) and piperonyl butoxide. Abamectin is a highly active macrocyclic lactone that has never been used before in an ear tag in Australia. The patentpending formulation contains a high loading of piperonyl butoxide which synergizes the abamectin for maximum pesticidal action. This insecticide has excellent activity against strains of Buffalo Fly known to be resistant to other chemical compounds like organophosphates and synthetic pyrethroids. This allows for the first time, an annual three way insecticidal rotation program to be adopted to reduce the impact of insecticide resistance. The AGRESSOR™ tag has a net weight of 9 grams and a metallic gold colour.


Controls susceptible buffalo flies for up to 12 weeks in Beef and Dairy Cattle (including lactating diary cattle).


AGRESSOR™ is available in 20 and 100 tag packs, in sachets of 20 tags each. Each tag contains a male button for attachment.


  1. AGRESSOR™ contains a unique chemical compound making it ideal for use as a third rotation option in the Insecticidal tag rotation program with organophosphates (OPtimizer™ and WARRIOR™) and synthetic pyrethriods (PYthon™ and PYthon MAXIMA™) to minimise Buffalo Fly insecticide resistance.

  2. Agressor™ is the only ear tag worldwide to contain a macrocyclic lactone, which has excellent pesticidal activity against OP and SP resistant strains of Buffalo Fly.

  3. Agressor™ provides control of Buffalo Fly for up to 12 weeks, reducing the need for frequent re-treatments
    and mustering costs.

  4. Works very rapidly, usually eliminating Buffalo Flies within 1 day.

  5. Agressor™ is the only synergised Abamectin tag worldwide, designed for extended release of active ingredients.

  6. The tag has no objectionable odour.

  7. Rainfast - Agressor™ was proven effective in field studies in North Queensland where rainfall in excess of 1,000mm was recorded over the four month trial period.

  8. Provides sustained pest control potency that can result in increased weight gains.

  9. Nil withholding period in meat of Beef Cattle and milk in Dairy Cattle (including lactating dairy cattle).

  10. Has patented Snap-Lok™ collar for guaranteed retention against tag or button failure for 5 months.

  11. Uses the proven two-piece application system.

Agressor Insecticidal Cattle
Ear Tag Brochure


Fact Sheet 8  Y-Tex Aggressor Ear Tags

Fact Sheet 8  Buffalo Fly Control Strategies for use with Warrior Insecticidal Ear Tags

Fact Sheet 9  The Dollar Benefit of Long-term Buffalo Fly Control on Cattle



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