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4.8 out of 5 stars. 20 reviews

Merck Ultra Boss Pour-On

4.820 Reviews

Item # 602027799

Image showing Ultra Boss Pour-On
Image showing Ultra Boss Pour-On
Image showing Ultra Boss Pour-On
Image showing Ultra Boss Pour-On
$249.99
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Merck Ultra Boss Pour-On

4.820 Reviews

Item # 602027799

Image showing Ultra Boss Pour-On
Image showing Ultra Boss Pour-On
Image showing Ultra Boss Pour-On
Image showing Ultra Boss Pour-On
$57.99 - $249.99
financeCard Logo
New Cardmembers earn a $20 Reward‡ with qualifying purchase of $20 or more plus earn 5% in Rewards+ on this purchase. Valid through 2/8/26.Apply now

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Merck Animal Health Ultra Boss Pour-On Insecticide (Permethrin And Piperonyl Butoxide) is used for beef, dairy and lactating cattle; sheep, goats and horses. Target species include: lice, horn flies, face flies, horse flies, stable flies, mosquitoes, black flies and ticks. Protection against horn flies lasts for about 8 weeks.

  • Low-volume dosage of pour-on insecticide 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)
  • Special Note: for cattle, horses, sheep and goats, repeat treatment as needed but not more than once every two weeks. for horses, do not saddle horse for 6 hours after application and refrain from washing down area of application. for optimum lice control, two treatments at 14-day intervals are recommended. Ultra Boss Pour-On Insecticide is not effective against cattle grubs

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Reviews

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4.8

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1 to 4 of 20 Reviews
1 – 4 of 20 Reviews
Review 1

Good Stuff!

4 months ago
Very good product. One of best products we have tried to keep flies at a minimum.

Originally posted on SCBT

Review 1

Quick Easy Fly Control

6 months ago
I only have a couple steers but I saw immediate results with fly control after applying Ultra Boss. Quick and easy to use.

Originally posted on SCBT

Review 1

Happier horses

6 months ago
Love this product. I combine it with fly spray when the flies are extremely bad.

Originally posted on SCBT

Review 1

Expensive but works great

11 months ago
Expensive but works for about 2-3 weeks without reapplication

Originally posted on SCBT