Altosid IGR XRB for Horn Fly Control

25 Boluses

Break the horn fly life cycle at the source with (S)-methoprene. This innovative bolus relies on the animal to deliver the active ingredient directly to the manure—where horn flies lay their eggs. Once administered, the bolus settles in the cow’s rumen and gradually dissolves, providing consistent release of (S)-methoprene for up to 195 days.

By interrupting the development of horn fly pupae into biting adults, this method offers long-term, effective fly control.

• Contains 1.5% (S)-methoprene

• Each bolus weighs 80 grams

Dosage Guidelines:

• Calves 300–659 lbs: ½ bolus

• Cattle 660–1,400 lbs: 1 bolus
  Administer at least 30 days before horn flies emerge or 30 days prior to the average last frost in your region.