Spreading horn fly resistance to
the pyrethroid insecticides used in
fly control ear tags is threatening
one of the best fly killers cattlemen
ever had. Some livestock advisors
hope using an alternative in
secticide may keep pyrethroids in
the fly control arsenal.
Ear tags are still as good as ever
for face fly control. However,
cases of horn fly resistance have
been documented in 16 states.
Livestock specialists say it’s'time
to look at what used to work.
“We never had any trouble
controlling flies with
organophosphates and dust bags,”
says John Campbell, extension
livestock entomologist at the
University of Nebraska - North
Platte.
“The ear tags were so con
venient that most cattlemen threw
away - or at least put away -
everything else,” he adds. Cat
tlemen may want to dig out the
dust bags and fill them with dust
again. In a forced-use situation,
dust bags have been shown to be
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Ear Tags May Not Be Enough
the most cost effective means of
applying insecticides, other than
tags. And organophosphate dusts,
such as Co-Ral (R), are among the
most effective fly killers.
“Where tags are still effective
against horn flies, I’d recommend
using them alone for fly control
until late July or early August,”
Campbell says. “We’ll usually
have a peak in both face fly and
hom fly populations in August.
Adding a dust bag to your fly
control program at that time will
give a boost in control.
“In addition, if resistance is
building in the hom fly population,
using an organophosphate in
secticide through the fall will
significantly reduce the number of
resistant hom flies that over
winter.
“Cattlemen who feel they need
the ear tags for face fly control
should be using organophosphates
as well if hom flies have shown any
degree of resistance to
pyrethroids,” he adds.
“We’re recommending both tags
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And Hedlund/
offers
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and dust bags according to the
situation,” says Fred Knapp,
University of Kentucky research
livestock entomologist. “We’ve put
the word out that producers who
have used ear tags for fly control
for two or more years should
consider using an
organophosphate insecticide,
whether they’ve seen resistance in
the horn fly population or not,” he
says.
Knapp says there is an ad*
vantage to using both ear tags and
another form of insecticide ap
plication - dust bags, for example -
- in controlling face flies.
“Studies here and at the USDA
research center in Beltsville, Md.
have shown improved face fly
control when using tags and dust
bags together,” Knapp says.
While hom flies suck blood from
cattle, face flies are a concern only
because they irritate eyes and
spread pinkeye bacteria.
Dr. Philip Widel, professional
services veterinarian for Anchor
Animal Health, says that while ear
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ftmtottoMiy HasNnr to mcWlr-mim* to
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Stop by your local Hedlund/
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Myerstown, PA 17067, for free
information.
/ hedSjndA
ZSSSCA
To Control Flies
ugs are still effective for con
trolling face flies, “They shouldn’t
be counted on to kill more than 70
percent of the face flies in areas
where they are a problem, and
that’s if you use two tags.”
The best approach to control
pinkeye, Widel says, is to reduce
fly pressure with insecticides, and
build cattle resistance with a
pinkeye vaccine.
Whether you use dust bags alone,
with tags, or as part of a pinkeye
control program, here are a few
pointers to remember:
• Hang dust bags in a gate or
Junior Angus Association Meets
HARRISBURG Nominations
for candidates and delegates for
the National Junior Angus Show
highlighted the Pennsylvania
Junior Angus Association’s
meeting at the Farm Show
Complex on Anril 1?
:
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WiA
*s?-
ByGehl
717-933-4151
alley leading to water or mineral
so animals are forced to use them.
• Introduce the bag slowly by
placing it to one side or above the
gate at first so cattle aren’t
blocked from water by the un
familiar object.
• The bottom of the bag should
be five to six inches lower than the
average back height of the cattle.
• Repair or replace worn, tom,
or frayed bags.
• Check bags frequently and
refill as necessary, using Co-Ral or
other organophosphate dust.
• Check bag for caking, par
ticularly after a rain.
The association also announces a
field day and sale to be held at Fox
Hill Farm on Aug. 8.
The next meeting of the junior
association will be held at the
home of Jan Waltz, Manheim, on
June?.
For The Solutions To Your
Manure Handling Problems,
Talk To Your
Hedlund-Martin Dealer
Today
PENNSYLVANIA
Abraczinskas Farm
Equipment
Inc.
Catawissa, PA
717-356-2323
B & R Farm
Equipment
Beavertown, PA
717-658-7024
Clark's Farm Supply
Williamsport, PA
717-494-0660
Norman D. Clark
ft Son Inc.
Honey Grove, PA
717-734-3682
Clugston Implement
Chambersburg, PA
717-263-4103
Dunkle ft Grieb
Center Hall, PA
814-364-9109
Mill Hall, PA
717-726-3115
Erb ft Henry Equip.,
Inc.
22-26 Henry Ave.
New Berlinville, PA
215-367-2169
H.R. Gutshall ft Sons
Carlisle, PA
717-249-2313
Loysville, PA
717-789-4343
A.L. Herr & Bro.
Quarryville, PA
717-786-3521
Hess Farm
Equipment, Inc.
Canton, PA
717-673-5143
Histand Farm &
Home Service
Rome, PA
717-744-2371
R.S. Hollinger & Son
Mountville, PA
717-285-4538
C.B. Hooker & Son
Intercourse, PA
717-768-8231
Lone Maple Sales
& Service
Inc.
New Alexander, PA
412-668-7172
Marshall Machinery,
Inc.
Honesdale, PA
717-729-7117
MftMßarn Sales
Westfield, PA
814-334-5504
McGarvey Equip. Inc.
Reynoldsville, PA
814-653-9637
Tobias Equipment
Co., Inc.
Halifax, PA
717-362-3132
Umberg er’s Of
Fontana,lnc.
Lebanon, PA
(Fontana)
717-867-5161
Zimmerman
Farm Service
Bethel, PA
717-933-4114
MARYLAND
H.B. Duvall
Frederick, MD
301-662-1125
Enfield
Equipment, Inc.
Whiteford, MD
301-452-5252
Farmer’s Supply Co.
Westminster, MD
301-848-6776
DELAWARE
Oelridge Supply, Inc.
Greenwood, DE
302-349-4327
NEW JERSEY
Jones Dairy .Service
Medford, NJ
609-267-0198