Skip to content
For More Information Please Visit Us at
For More Information Please Visit Us at

Merck Ultra Boss Pour-On Insecticide 32oz

ULTRA BOSS Pour On insecticide is used for beef, dairy and lactating cattle; sheep, goats and horses. Target species include: lice, horn flies, face flies, horse flies, stable flies, mosquitos, black flies and ticks.
  • Low-volume dosage reduces time and labor
  • Effective horn fly control for 8 weeks. Also controls face flies
  • Season-long lice control with one application (January through April)
  • Apply 3 mL per 100 lb. body weight, up to 30 mL maximum application limit.
  • Also approved for use in backrubbers
  • For optimum lice control, two treatments at 14-day intervals are recommended