STANDGUARD® POUR-ON
Delivers quick-kill action on horn flies
and lice in all classes of beef cattle
HORN FLIES
CHEWING & SUCKING LICE
StandGuard® Pour-on — Controlling
Horn Flies and Lice in Beef Cattle
StandGuard® Pour-on insecticide delivers effective, powerful,
season-long control of horn flies and lice on beef cattle and calves1
1
Powerful
• Most potent pyrethroid on the market1
• Quick-kill action
2
Innovative
• Contains gamma-cyhalothrin, the latest technology for beef cattle
in the pyrethroid class
• Not previously used in beef cattle
3
Convenient
• Ready to use — no dilution necessary
• Available in 30-fl oz (900 mL) bottles with an easy squeeze-andpour design ideal for smaller treatment groups
• Also available in 4.5 L size, which is more convenient for large
operations
Indications
• For control of lice and horn flies on beef cattle and calves
• Season-long control of lice with a single application
Dose and application
• Requires a single-dose application for all classes of beef
cattle, once treatment threshold has been reached
- Treatment threshold: when lice densities average more
than three/square inch of skin surface area2
• Apply StandGuard Pour-on along the backline at the rate of:
- Cattle less than 600 lbs: 10 mL (1/3 fl oz)
- Cattle 600 lbs or more: 15 mL (1/2 fl oz)
• One 900 mL bottle treats:
- 90 head weighing less than 600 lbs
- 60 head weighing 600 lbs or more
• One 4.5 L bottle treats:
- 450 head weighing less than 600 lbs
- 300 head weighing 600 lbs or more
StandGuard Pour-on
Applicator Gun
Improve treatment accuracy
with the high-quality,
long-lasting applicator gun.
Horn Flies in Beef Cattle
Heavy horn fly populations in cattle decrease grazing efficiency,
reduce weight gain and reduce milk production2,3
Impact of horn flies on performance, behavior and economics
• Horn flies are the number one pest for U.S. pasture cattle, costing
producers more than $876 million4 annually
• Heavy horn fly populations may reduce stocker gains 15 to 50 lbs, calf
weaning weights 10 to 15 lbs, and milk production in pastured cows by
20 percent2
• At the treatment threshold (see below), normal grazing patterns are
altered as cattle attempt to gain relief from horn fly infestation and the
following can be observed:3
- Decreased grazing time
- Increased traveling
- Increased tail switching
- Standing in groups
- Standing in water
Life cycle
• The complete life cycle of a horn fly takes
to
9-
10 to 20 days2
• Adults emerge in late March, April or May and
populations peak mid- to late-summer and early fall2
• A single female produces as many as 400 to 500
eggs during her lifetime2
• Horn flies pierce the animal’s skin to
ingest blood 20 to 30 times each day2,5
• Horn flies are about half the size of houseflies and
can be differentiated from houseflies and stable flies
by their slender appearance2
Horn fly
Actual Size
Horn fly
y
-da
10
lt
a du
n
life spa
2 Deposits eggs in nearby manure
1 Adult female
and then returns to animal
ingests blood
from host animal
3 Eggs hatch into
larvae within
18 hours
6 Adults emerge
from pupal case
5 Larvae change
4 Larvae grow and
feed in manure
for 3 to 5 days
into pupae in 3
to 5 days
Housefly
Horn Fly
Treatment threshold
200
horn
flies
• Economic losses occur at 200 horn flies per animal.
Treatment initiation is advised when a threshold
of 100 horn flies per animal is reached5
• Rule of thumb: 200 horn flies can fit in
the space of your hand
10- to 11-d
ay d
t
en
m
p
lo
e ve
Lice in Beef Cattle
Lice
Lice infestations cost the U.S. cattle industry more than
$125 million annually2,4
Actual Size
Chewing
Moderate to heavy lice infestations can significantly
reduce gain by as much as 9.2 percent, which is
equivalent to 0.21 lbs/hd/day in growing cattle2,3,6
Sucking
Impact of lice on performance, behavior and health2
• Heavy lice populations in growing cattle:
- Reduce average daily gain and weaning weights
- Decrease feed efficiency
- Increase susceptibility to diseases
- May result in anemia
• Heavy lice populations in cows:
- Reduce milk production
- Decrease body condition score (BCS)
• Chewing and sucking lice reduce performance
and irritate cattle, causing them to rub against
available objects, which damages hides,
fences, equipment and buildings
Treatment threshold2 — lice
densities averaging more than three/
square inch of skin surface area
Heavy louse populations cause
cattle to rub against objects
causing hair loss and hide damage
Prevalence7
• Lice are found throughout North America and are more prevalent in colder climates:
- In the summer, lice are most commonly found in the folds of skin between the legs and dewlap of cattle
- In the winter, as populations increase, lice move to the dewlap, muzzle, back, sides, tailhead, neck, side of
the face and around the eyes
Life cycle2,7
1 Adult lice live for eight weeks and spend all of their lives on the animal
•Lice are host-specific and transmission is from animal to animal
2
2 Each female lays 35 to 70 eggs on cattle hair
3 A louse nymph emerges and matures into an adult within
approximately one month, depending on temperature and humidity
•Reproduction rate increases during cold weather
3
1
The label contains complete use information, including cautions and warnings.
Always read, understand and follow the label and use directions.
Elanco Animal Health study numbers: D3A290503, D3A480504, D3A550602 & D3A310601; Dow Cheminova study number: Y45175001.
Campbell, J. B. 1992, Revised 2006. Lice control on cattle. NebGuide G1112. Elanco Reference No. 0194.
Byford, R. L., M. E. Craig & B. L. Crosby. 1992. A review of ectoparasites and their effect on cattle production. J. Ani. Sci. 70:597-602. Elanco Reference No. 3333.
4
Kunz, S. E., K. D. Murrell, G. Lambert, L. F. James & C. E. Terrill. 1991. Estimated losses of livestock to pests. CRC handbook of pest management in agriculture. 1:6998. Elanco Reference No. 0758.
5
Koehler, P. G., J. F. Butler & P. E. Kaufman. 2005. Horn flies. University of Florida Extension ENY-285. Elanco Reference No. 3334.
6
Gibney, V. J., J. B. Campbell, D. J. Boxler, D. C. Clanton & G. H. Deutscher. 1985. Effects of various infestation levels of cattle lice on feed efficiency and weight gains of
beef heifers. J. Econ. Entomol. 78:1304.
7
Mock, D. E. Lice on beef cattle. Beef cattle handbook. BCH-3805. Elanco Reference No. 3337.
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StandGuard® is a trademark for Elanco’s brand of gamma-cyhalothrin.
Elanco, StandGuard® and the diagonal bar are trademarks owned or licensed by Eli Lilly and Company, its subsidiaries or affiliates.
© 2014 Elanco Animal Health.
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