Target Horn Flies With MAGNUM Force!


PYthon® MAGNUM is a sustained-release, plastic ear tag containing a synergized formulation of zetacypermethrin, a potent, enriched S-isomer pyrethroid compound. This insecticide has excellent activity against many pests, including horn flies that are resistant to certain other insecticides. PYthon MAGNUM’s larger net weight of 15.4 grams per tag provides greater insecticide release for maximum effectiveness against horn flies and other ectoparasites.


Controls horn flies and biting lice. Aids in control of face flies, stable flies, house flies and sucking lice.



  1. Labeled for use at one tag per head on beef and dairy cattle, including calves over 3 months of age and lactating dairy cows.


  2. The only synergized pyrethroid tag with 15.4 grams net weight providing, in nearly all cases, 62% more active ingredient than similar competitive tags.


  3. Provides maximum pest control potency and economy against horn flies, face flies, stable flies, house flies and lice.


  4. Design for extended insecticide release.


  5. One tag per head controls most strains of horn flies and aids in control of face flies, stable flies and house flies for up to 4 months and controls pyrethroid susceptible horn flies for up to 5 months.


  6. One tag per head controls biting lice and aids in control of sucking lice for up to 3 months.


  7. Sustained horn fly control can result in increased calf weight gains.


  8. There is no withdrawal time required for either meat or milk.


  9. Has Y-TEX patented Snap-Lok® collar for guaranteed retention against tag or button failure for 5 months.


  10. Ideal for rotation with WARRIOR™, OPtimizer®, DIAPHOS™Rx or other organophosphate tags to help manage horn fly resistance to insecticides.  

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PYthon MAGNUM is available in packages of 20 tags and in Ranch Packs of 100 tags (5 pouches of 20 tags each). Each tag includes a male button for attachment.


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