UNITED
STATES
ENVIRONMENTAL
PROTECTION
AGENCY
WASHINGTON,
D.
C.
20460
OFFICE
OF
PREVENTION,
PESTICIDES
AND
TOXIC
SUBSTANCES
MEMORANDUM
SUBJECT:
Imazapyr
Use
Closure
Memo
(
PC
Codes
128821
&
128829)

FROM:
Robert
McNally,
Branch
Chief
Special
Review
Branch
Special
Review
and
Reregistration
Division
TO:
Tina
Levine,
Director
Health
Effects
Division
Steven
Bradbury,
Director
Environmental
Fate
and
Effects
Division
This
memo
serves
as
the
imazapyr
Use
Closure
Memo
and
clarifies
imazapyr
uses
and
usage
data
for
the
Reregistration
Eligibility
Decision
(
RED)
risk
assessments.
The
risk
assessments
for
imazapyr
will
be
based
on
the
use
sites
and
usage
data
in
BEAD's
LUIS
report,
documents
presented
by
the
registrants,
and
the
product
labels.

Imazapyr
is
a
systemic
herbicide
and
belongs
to
the
imidazolinone
chemical
family.
Imazapyr
is
used
on
both
agricultural
and
non­
agricultural
sites,
including:
corn,
agricultural
rights­
of­
way/
fencerows/
hedgerows,
agricultural
uncultivated
areas,
drainage
systems,
forests,
outdoor
industrial
areas,
non­
agricultural
outdoor
buildings/
structures,
non­
agricultural
rights­
of­
way/
fencerows/
hedgerows,
non­
agricultural
cultivated
areas,
paved
areas
(
pre­
construction),
household/
domestic
dwellings/
walkways,
lakes/
ponds/
reservoirs,
streams/
rivers/
channeled
water,
swamps/
marshes/
wetlands/
stagnant
water,
urban
areas,
and
conifer
trees
(
for
conifer
release).
A
complete
list
of
use
sites
and
use
patterns
is
included
in
the
use
information
attached
with
this
memo.

Imazapyr
can
be
applied
as
a
pre­
emergence
or
post­
emergence
treatment.
Applications
can
be
made
with
aerial
and
ground
equipment.
Hand­
held
applications
can
also
be
made;
including
applications
with
handguns,
hand
held
sprayers,
paint
brushes,
pump
sprayers,
backpack
sprayers,
sprinkler
cans,
and
tree
injection
equipment.

The
technical
registrant,
BASF,
is
supporting
all
of
the
uses
for
reregistration
that
are
currently
on
active
labels.
Usage
information
for
imazapyr
can
be
found
in
the
attached
tables.
The
A2
table
contains
information
on
food/
feed
use
patterns
and
the
A3
table
contains
information
on
non
food/
non­
feed
use
patterns.

If
you
have
any
questions
or
concerns
regarding
this
memorandum,
please
contact
Mika
J.
Hunter
at
(
703)
308­
0041.

Attachments:
Table
A2
and
A3
for
PC
Code
128821
Table
A2
and
A3
for
PC
Code
128829
Cc:
Daniel
Rieder
Bill
Hazel
Sherrie
Kinard
Charles
(
Billy)
Smith
Elissa
Reaves
Lucy
Shanaman
Stephanie
Syslo
Jim
Tompkins
Bill
Phillips
TJ
Wyatt
