Bifenthrin/
128825/
BASF
DACO
7.4.1/
7.4.2/
OPPTS
860.1500/
OECD
IIA
6.3.1,
6.3.2,
6.3.3
and
IIIA
8.3.1,
8.3.2,
8.3.3
Crop
Field
Trial
 
Potatoes
DP#:
310089/
MRID#:
45794203
Page
1
of
9
Primary
Evaluator:
Sarah
J.
Levy,
Chemist
Registration
Action
Branch
1
(
RAB1)
Health
Effects
Division
(
HED;
7509C)
Date:
06­
APR­
2006
Approved
by:
George
Kramer,
Ph.
D.,
Chemist
RAB1/
HED
(
7509C)
Date:
06­
APR­
2006
This
DER
was
originally
prepared
under
contract
by
Dynamac
Corporation
(
1910
Sedwick
Rd.,
Bld.
100,
Durham,
NC
27713;
submitted
17­
OCT­
2005.
The
DER
has
been
reviewed
by
HED
and
revised
to
reflect
current
Office
of
Pesticide
Programs
(
OPP)
policies.

STUDY
REPORT:

45794203.
Culligan,
J.
(
2001)
Magnitude
of
the
Residue
of
Bifenthrin
in/
on
Potatoes
and
Potato
Processed
Parts
Following
Treatment
with
Capture
1.15G
and
Capture
2EC
Insecticide­
Miticide.
Lab
Project
Number:
P­
3526.
Study
No
182POT01R1.
Unpublished
study
prepared
by
FMC
Corporation.
240
pages.

EXECUTIVE
SUMMARY:

Twelve
potato
field
trials
were
conducted
during
2001
comparing
the
use
of
two
bifenthrin
formulations.
At
each
trial,
bifenthrin
(
2
lb/
gal
emulsifiable
concentrate
(
EC)
or
1.15%
granular
(
G))
was
applied
to
potatoes
as
one
in­
furrow
application
at
0.3
lb
ai/
A
followed
by
two
broadcast
foliar
applications
of
the
2
lb/
gal
EC
at
0.1
lb
ai/
A/
application,
for
a
total
of
0.5
lb
ai/
A/
season.
The
in­
furrow
application
was
made
prior
to
planting,
and
the
foliar
applications
were
made
late
in
the
season,
approximately
42
and
21
days
prior
to
normal
maturity.
Duplicate
control
and
treated
samples
of
potatoes
were
harvested
at
commercial
maturity
from
treatment
at
each
trial
site,
at
approximately
20­
21­
day
pre­
harvest
intervals
(
PHIs).
Samples
were
stored
frozen
for
up
to
1
month,
an
interval
supported
by
the
available
storage
stability
data.

The
gas
chromatography
(
GC)/
mass­
selective
detection
(
MSD)
method
used
to
determine
bifenthrin
residues
in/
on
potatoes
(
FMC
Corporation
Report
No.
P­
3426,)
was
adequately
validated
in
conjunction
with
the
field
trial
analyses.
Briefly,
bifenthrin
residues
are
extracted
with
acetone,
concentrated,
and
purified
by
silica
gel
solid
phase
extraction.
The
residues
were
analyzed
by
GC­
MSD.
The
validated
limit
of
quantitation
(
LOQ)
was
0.05
ppm,
and
the
limit
of
detection
(
LOD)
was
0.01
ppm.

Regardless
of
the
type
of
formulation
used
for
the
in­
furrow
application
(
G
or
EC),
bifenthrin
residues
were
<
0.05
(<
LOQ)
ppm
in/
on
all
48
samples
of
potatoes
harvested
at
~
20­
21­
day
PHIs.
The
average
and
highest
average
field
trial
(
HAFT)
residues
in/
on
potatoes
were
0.025
and
0.05
ppm,
respectively.
Residue
decline
information
could
not
be
determined
from
the
two
decline
trials
because
of
the
lack
of
residues
found
at
any
of
the
sampling
points.

STUDY/
WAIVER
ACCEPTABILITY/
DEFICIENCIES/
CLARIFICATIONS:

Under
the
conditions
and
parameters
used
in
the
study,
the
potato
field
trial
residue
data
are
classified
as
scientifically
acceptable,
although
complete
information
on
soil
characteristics
Bifenthrin/
128825/
BASF
DACO
7.4.1/
7.4.2/
OPPTS
860.1500/
OECD
IIA
6.3.1,
6.3.2,
6.3.3
and
IIIA
8.3.1,
8.3.2,
8.3.3
Crop
Field
Trial
 
Potatoes
DP#:
310089/
MRID#:
45794203
Page
2
of
9
should
typically
be
supplied
for
studies
in
which
the
pesticide
is
applied
to
the
soil.
The
acceptability
of
this
study
for
regulatory
purposes
is
addressed
in
the
forthcoming
U.
S.
EPA
Residue
Chemistry
Summary
Document
[
DP#:
310089].

COMPLIANCE:

Signed
and
dated
Good
Laboratory
Practice
(
GLP),
Quality
Assurance
and
Data
Confidentiality
statements
were
provided.
The
study
authors
noted
numerous
minor
deviations
from
GLP
compliance
at
the
trial
site,
including
the
collection
of
weather
data
and
descriptions
of
the
field
plot.
However,
these
deviations
do
not
impact
the
validity
of
the
study.

A.
BACKGROUND
INFORMATION
Bifenthrin
is
a
broad
spectrum,
non­
systemic
insecticide/
miticide
in
the
class
of
synthetic
pyrethroids
(
Group
3).
Bifenthrin
is
formulated
for
use
on
crop
plants
as
a
2.0
lb/
gal
EC
(
Capture
®
2
EC;
EPA
Reg.
No.
279­
3069)
and
as
a
1.15%
G
(
Capture
1.15G;
EPA
Reg.
No.
279­
3244).

TABLE
A.
1.
Nomenclature
of
Bifenthrin
Compound
O
O
Cl
F
3
C
CH
3
CH
3
C
H
3
Common
name
Bifenthrin
Company
experimental
names
Capture
®
Insecticide/
Miticide
IUPAC
name
2­
methylbiphenyl­
3­
ylmethyl(
Z)­(
1RS,
3RS)­
3­(
2­
chloro­
3,3,3­
trifluoroprop­
1­
enyl)­
2,2dimethylcyclopropanecarboxylate
or
2­
methylbiphenyl­
3­
ylmethyl(
Z)­(
1RS)­
cis­
3­(
2­
chloro­
3,3,3­
trifluoroprop­
1­
enyl)­
2,2dimethylcyclopropanecarboxylate
CAS
name
rel­
2­
methyl(
1,1'­
biphenyl)­
3­
yl)
methyl(
1R,
3R)­
3­((
1Z)­
2­
chloro­
3,3,3­
trifluoro­
1­
propenyl)­
2,2­
dimethylcyclopropanecarboxylate
CAS
#
82657­
04­
03
End­
use
products/
EP
2.0
lb/
gal
EC
(
Capture
®
2EC;
EPA
Reg
No.
279­
3069)

1.15%
G
(
Capture
®
1.15G;
EPA
Reg
No.
279­
3244)
Bifenthrin/
128825/
BASF
DACO
7.4.1/
7.4.2/
OPPTS
860.1500/
OECD
IIA
6.3.1,
6.3.2,
6.3.3
and
IIIA
8.3.1,
8.3.2,
8.3.3
Crop
Field
Trial
 
Potatoes
DP#:
310089/
MRID#:
45794203
Page
3
of
9
TABLE
A.
2.
Physicochemical
Properties
of
the
Technical
Grade
Bifenthrin
Parameter
Value
Reference
Melting
point/
range
68­
70.6
°
C
pH
NA
Density
at
24
°
C
1.26
g/
mL
Water
solubility
<
0.1
Fg/
L
Solvent
solubility
(
g/
100
mL)
8.9
in
heptane
and
methanol
125
in
acetone,
chloroform,
ether,
methylene
chloride,
and
toluene
Vapor
pressure
(
Pa)
at
25
°
C
2.41
x
10­
5
Dissociation
constant
(
pKa)
NA
Octanol/
water
partition
coefficient)
Kow
>
1
x
106
UV/
visible
absorption
spectrum
NA
Product
Chemistry
Chapter
of
the
Tolerance
Reassessment
Eligibility
Decsion
(
TRED)

B.
EXPERIMENTAL
DESIGN
B.
1.
Study
Site
Information
Potatoes
were
grown
and
maintained
at
each
trial
site
using
typical
agricultural
practices
for
the
respective
geographical
region
(
Table
B.
1.1).
Rainfall,
irrigation
data,
and
minimum
and
maximum
average
monthly
temperatures
were
reported
for
most
trial
sites,
although
several
trial
sites
just
reported
general
weather
observations.
Compared
to
10­
year
average
data,
variations
from
average
precipitation
and
air
temperature
were
reported
at
several
sites,
but
no
extreme
weather
conditions
were
noted
that
would
adversely
impact
the
field
trial
data.
Information
was
also
provided
on
maintenance
chemicals
and
other
pesticides
used
at
each
site.
However,
information
on
soil
characteristics
was
incomplete;
these
data
are
typically
required
for
applications
made
to
the
soil.

TABLE
B.
1.1.
Trial
Site
Conditions.
Soil
characteristics1
Trial
Identification
(
City,
State;
Year)
Type
%
OM
pH
CEC
(
meq/
g)
Dundee,
NY;
2001
Loam
3.3
6.2
NR
North
Rose,
NY;
2001
Sand
NR
NR
NR
Sunbury,
NC;
2001
Fine
Sandy
Loam
NR
NR
NR
Hobe
Sound,
FL;
2001
Fine
Sand
NR
NR
NR
Fitchburg,
WI;
2001
Silt
Loam
2.9
5.5
NR
Wahpeton,
ND;
2001
Loam
4.3
5.4
NR
Center,
CO;
2001
Loamy
Sand
NR
NR
NR
Visalia,
CA;
2001
Sandy
Loam
NR
NR
NR
Moses
Lake,
WA;
2001
Silt
Loam
NR
NR
NR
Walla
Walla,
WA;
2001
Silt
Loam
2.5
7.8
NR
Jerome,
ID;
2001
Loam
1.4
7.4
NR
Rupert,
ID;
2001
Silt
Loam
NR
NR
NR
1
OM
=
Organic
matter,
CEC
=
Cation­
exchange
capacity.
These
parameters
are
optional
except
in
cases
where
their
value
affects
the
use
pattern
for
the
chemical.
Bifenthrin/
128825/
BASF
DACO
7.4.1/
7.4.2/
OPPTS
860.1500/
OECD
IIA
6.3.1,
6.3.2,
6.3.3
and
IIIA
8.3.1,
8.3.2,
8.3.3
Crop
Field
Trial
 
Potatoes
DP#:
310089/
MRID#:
45794203
Page
4
of
9
NR
=
Not
reported
Each
trial
site
used
two
treatment
regimes,
in
addition
to
a
control
plot
(
Trt
1).
For
one
treatment
(
Trt
2),
the
1.15%
G
formulation
was
used
for
the
in­
furrow
application,
and
for
the
other
treatment
(
Trt
3)
the
2
lb/
gal
EC
formulation
was
used
for
the
in­
furrow
application.
Both
treatments
used
the
EC
formulation
for
the
foliar
application
(
Table
B.
1.2).

TABLE
B.
1.2.
Study
Use
Pattern
s.
Application
Information2
Location
(
City,
State;
Year)
Trial
ID
Treatment
No.
EP1
Method;
Timing
Volume
(
GPA)
Single
Rate
(
lb
ai/
A)
RTI3
(
days)
Total
Rate
(
lb
ai/
A)

1.15G
In
Furrow
at
planting
NA
0.3
NA
10
0.1
49
2
2
lb/
gal
EC
Two
broadcast
foliar
applications
at
42
and
21
days
prior
to
harvest
10
0.1
21
In
Furrow
at
planting
10
0.3
NA
10
0.1
49
Dundee,
NY;
2001
1
3
2
lb/
gal
EC
Two
broadcast
foliar
applications
at
42
and
21
days
prior
to
harvest
10
0.1
21
0.5
1.15G
In
Furrow
at
planting
NA
0.3
NA
10
0.1
52
2
2
lb/
gal
EC
Two
broadcast
foliar
applications
at
42
and
21
days
prior
to
harvest
10
0.1
21
In
Furrow
at
planting
10
0.3
NA
10
0.1
52
North
Rose,
NY;
2001
2
3
2
lb/
gal
EC
Two
broadcast
foliar
applications
at
42
and
21
days
prior
to
harvest
10
0.1
21
0.5
1.15G
In
Furrow
at
planting
NA
0.3
NA
11
0.1
66
2
2
lb/
gal
EC
Two
broadcast
foliar
applications
at
42
and
21
days
prior
to
harvest
10
0.1
21
In
Furrow
at
planting
10
0.3
NA
11
0.1
66
Sunbury,
NC;
2001
3
3
2
lb/
gal
EC
Two
broadcast
foliar
applications
at
42
and
21
days
prior
to
harvest
10
0.1
21
0.5
1.15G
In
Furrow
at
planting
NA
0.3
NA
10
0.1
49
2
2
lb/
gal
EC
Two
broadcast
foliar
applications
at
42
and
21
days
prior
to
harvest
10
0.1
21
In
Furrow
at
planting
10
0.3
NA
10
0.1
49
Hobe
Sound,
FL;
2001
4
3
2
lb/
gal
EC
Two
broadcast
foliar
applications
at
42
and
21
days
prior
to
harvest
10
0.1
21
0.5
1.15G
In
Furrow
at
planting
NA
0.3
NA
10
0.1
56
2
2
lb/
gal
EC
Two
broadcast
foliar
applications
at
42
and
20
days
prior
to
harvest
11
0.1
22
In
Furrow
at
planting
10
0.3
NA
10
0.1
56
Fitchburg,
WI;
2001
5
3
2
lb/
gal
EC
Two
broadcast
foliar
applications
at
42
and
20
days
prior
to
harvest
11
0.1
22
0.5
1.15G
In
Furrow
at
planting
NA
0.3
NA
10
0.1
75
2
2
lb/
gal
EC
Two
broadcast
foliar
applications
at
42
and
21
days
prior
to
harvest
10
0.1
21
In
Furrow
at
planting
10
0.3
NA
10
0.1
75
Wahpeton,
ND;
2001
6
3
2
lb/
gal
EC
Two
broadcast
foliar
applications
at
42
and
21
days
prior
to
harvest
10
0.1
21
0.5
Bifenthrin/
128825/
BASF
DACO
7.4.1/
7.4.2/
OPPTS
860.1500/
OECD
IIA
6.3.1,
6.3.2,
6.3.3
and
IIIA
8.3.1,
8.3.2,
8.3.3
Crop
Field
Trial
 
Potatoes
DP#:
310089/
MRID#:
45794203
Page
5
of
9
Application
Information2
Location
(
City,
State;
Year)
Trial
ID
Treatment
No.
EP1
Method;
Timing
Volume
(
GPA)
Single
Rate
(
lb
ai/
A)
RTI3
(
days)
Total
Rate
(
lb
ai/
A)

1.15G
In
Furrow
at
planting
NA
0.3
NA
10
0.1
64
2
2
lb/
gal
EC
Two
broadcast
foliar
applications
at
42
and
21
days
prior
to
harvest
10
0.1
21
In
Furrow
at
planting
10
0.3
NA
10
0.1
64
Center,
CO;
2001
7
3
2
lb/
gal
EC
Two
broadcast
foliar
applications
at
42
and
21
days
prior
to
harvest
10
0.1
21
0.5
1.15G
In
Furrow
at
planting
NA
0.3
NA
11
0.1
71
2
2
lb/
gal
EC
Two
broadcast
foliar
applications
at
41
and
21
days
prior
to
harvest
10
0.1
21
In
Furrow
at
planting
10
0.3
NA
11
0.1
71
Visalia,
CA;
2001
8
3
2
lb/
gal
EC
Two
broadcast
foliar
applications
at
41
and
21
days
prior
to
harvest
10
0.1
21
0.5
1.15G
In
Furrow
at
planting
NA
0.3
NA
10
0.1
109
2
2
lb/
gal
EC
Two
broadcast
foliar
applications
at
42
and
21
days
prior
to
harvest
10
0.1
21
In
Furrow
at
planting
10
0.3
NA
10
0.1
109
Moses
Lake,
WA;
2001
9
3
2
lb/
gal
EC
Two
broadcast
foliar
applications
at
42
and
21
days
prior
to
harvest
10
0.1
21
0.5
1.15G
In
Furrow
at
planting
NA
0.3
NA
10
0.1
101
2
2
lb/
gal
EC
Two
broadcast
foliar
applications
at
42
and
21
days
prior
to
harvest
10
0.1
21
In
Furrow
at
planting
10
0.3
NA
10
0.1
101
Walla
Walla,
WA;
2001
10
3
2
lb/
gal
EC
Two
broadcast
foliar
applications
at
42
and
21
days
prior
to
harvest
10
0.1
21
0.5
1.15G
In
Furrow
at
planting
NA
0.3
NA
11
0.1
89
2
2
lb/
gal
EC
Two
broadcast
foliar
applications
at
42
and
21
days
prior
to
harvest
11
0.1
21
In
Furrow
at
planting
11
0.3
NA
11
0.1
89
Jerome,
ID;
2001
11
3
2
lb/
gal
EC
Two
broadcast
foliar
applications
at
42
and
21
days
prior
to
harvest
11
0.1
21
0.5
1.15G
In
Furrow
at
planting
NA
0.3
NA
10
0.1
77
2
2
lb/
gal
EC
Two
broadcast
foliar
applications
at
43
and
21
days
prior
to
harvest
10
0.1
22
In
Furrow
at
planting
10
0.3
NA
10
0.1
77
Rupert,
ID;
2001
12
3
2
lb/
gal
EC
Two
broadcast
foliar
applications
at
43
and
21
days
prior
to
harvest
10
0.1
22
0.5
1
EP
=
End­
use
products.
2
No
adjuvants
were
included
in
any
of
the
spray
mixes.
3
RTI
=
Retreatment
Interval
Bifenthrin/
128825/
BASF
DACO
7.4.1/
7.4.2/
OPPTS
860.1500/
OECD
IIA
6.3.1,
6.3.2,
6.3.3
and
IIIA
8.3.1,
8.3.2,
8.3.3
Crop
Field
Trial
 
Potatoes
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310089/
MRID#:
45794203
Page
6
of
9
TABLE
B.
1.3.
Trial
Numbers
and
Geographical
Locations.

Potatoes
Requested
NAFTA
Growing
Region1
Submitted
Canada
US
1
2
NA
2
2
1
NA
1
3
1
NA
1
5
2
NA
2
8
­­
NA
1
9
1
NA
1
10
1
NA
4
11
4
NA
­­

Total
12
NA
12
1
Regions
13­
21
and
1A,
5A,
5B,
and
7A
were
not
included
as
the
use
is
for
the
US
only.
NA
=
not
applicable.

B.
2.
Sample
Handling
and
Preparation
Single
control
and
duplicate
treated
samples
of
potatoes
( 
5
lbs)
were
harvested
from
each
treatment
at
each
site
at
commercial
maturity.
Samples
were
collected
20­
21
days
following
the
second
foliar
application
except
at
the
FL
trial
site,
where
samples
were
collected
at
a
14­
day
PHI
due
to
an
infestation
of
late
blight.
At
two
trial
sites
in
NY
and
ID,
additional
duplicate
samples
were
collected
at
14­,
21­,
28­,
and
35­
day
PHIs
to
examine
residue
decline.
All
samples
were
placed
into
frozen
storage
within
3.5
hours
of
sampling.
Samples
were
shipped
frozen
by
ACDS
freezer
truck
to
the
analytical
laboratory
(
FMC
Corporation,
Princeton,
NJ),
where
samples
were
stored
at
­
18
°
C
until
extraction
for
analysis.

B.
3.
Analytical
Methodology
Samples
of
potatoes
were
analyzed
for
residues
of
bifenthrin
using
a
GC/
MSD
method
(
FMC
Corporation
Method
P­
2132M).

For
this
method,
residues
of
bifenthrin
are
extracted
with
acetone,
centrifuged,
and
concentrated
to
an
aqueous
remainder
under
nitrogen.
Residues
were
then
partitioned
into
hexane
and
purified
on
a
silica
gel­
solid­
phase
extraction
(
SPE)
cartridge.
Residues
are
eluted
from
the
SPE
cartridge
with
10%
ethyl
acetate/
hexane
and
concentrated.
Residue
levels
of
bifenthrin
were
analyzed
by
gas
chromatographic
analysis
using
a
mass
selective
detector,
using
the
m/
z
181
ion
for
quantitation.
External
standards
were
used
for
quantitation.

In
conjunction
with
the
analysis
of
field
trial
samples,
the
method
was
validated
using
control
samples
of
potatoes
fortified
with
bifenthrin
at
0.05,
0.1
and
0.2
ppm.

C.
RESULTS
AND
DISCUSSION
The
number
and
geographic
representation
of
the
potato
field
trials
are
adequate.
In
twelve
field
trials
conducted
during
2001,
bifenthrin
(
G
or
EC)
was
applied
as
an
in­
furrow
application
at
0.3
Bifenthrin/
128825/
BASF
DACO
7.4.1/
7.4.2/
OPPTS
860.1500/
OECD
IIA
6.3.1,
6.3.2,
6.3.3
and
IIIA
8.3.1,
8.3.2,
8.3.3
Crop
Field
Trial
 
Potatoes
DP#:
310089/
MRID#:
45794203
Page
7
of
9
lb
ai/
A/
application
and
followed
by
two
late­
season
broadcast
foliar
applications
of
the
2
lb/
gal
EC
at
0.1
lb
ai/
A/
application,
for
a
total
of
0.5
lb
ai/
A/
season.
The
RTIs
were
49­
109
days
between
the
in­
furrow
application
and
the
1st
foliar
application,
and
20­
22
days
between
the
two
foliar
applications.
A
single
control
and
duplicate
treated
samples
of
potato
tubers
were
collected
at
commercial
maturity
(
20­
21­
day
PHIs)
from
each
treatment.
Samples
from
the
FL
trials
were
collected
early
(
14­
day
PHI)
due
to
problems
with
infestation
of
late
blight.
Additional
samples
were
also
collected
at
14­,
21­,
28­,
and
35­
day
PHIs
from
two
trials
in
NY
and
ID
to
examine
residue
decline.

The
GC/
MSD
method
used
to
determine
bifenthrin
residues
in/
on
potatoes
was
adequately
validated
concurrently
with
the
field
sample
analyses.
Concurrent
validation
recoveries
from
control
samples
fortified
at
0.05­
0.2
ppm
averaged
72­
86%
with
standard
deviations
8­
12%.
Apparent
residues
of
bifenthrin
were
<
LOQ
on
all
control
samples.
The
validated
method
LOQ
for
bifenthrin
in
potatoes
is
0.05
ppm
and
the
LOD
is
0.01ppm.
Adequate
sample
calculations
and
example
chromatograms
were
provided.

The
samples
were
stored
frozen
from
collection
to
analysis
for
up
to
65
days
(
Table
C.
2).
Storage
stability
data
are
available
indicating
that
bifenthrin
is
stability
in
frozen
potatoes
for
up
to
36
months
(
Memo,
S.
Levy,
21­
AUG­
2002;
DP#:
283808).

TABLE
C.
1.
Summary
of
Concurrent
Recoveries
of
Bifenthrin
from
Potatoes.
Analyte
Matrix
Spike
level
(
ppm)
Sample
size
(
n)
Recoveries
(%)
Mean
"
std
dev
(%)
0.05
6
95,
97,
76,
87,
93,
68
(
1)
1
86
±
12
0.1
3
91,
76,
74
80
±
9
Bifenthrin
Potato
0.2
2
66,
77
72
±
8
1
The
number
of
recoveries
outside
the
70­
120%
range
is
indicated
in
parentheses.

TABLE
C.
2.
Summary
of
Storage
Conditions.
Matrix
Storage
Temperature
(
°
C)
Actual
Storage
Duration
(
days)
Interval
of
Demonstrated
Storage
Stability
(
months)
Potato
­
18
°
C
65
36
1
Bifenthrin
TRED,
S.
Levy,
21­
AUG­
2002;
DP#:
283808.

Regardless
of
the
type
of
formulation
used
for
the
in­
furrow
application
(
G
or
EC),
bifenthrin
residues
were
<
0.05
(<
LOQ)
ppm
in/
on
all
48
samples
of
potatoes
harvested
14­
21­
day
PHIs
(
Table
C.
3).
Detectable
residues
of
bifenthrin
(
0.01­
0.02
ppm)
were
observed
in
only
7
of
the
48
samples,
and
these
7
samples
were
all
from
trials
using
the
EC
for
the
in­
furrow
application.
The
average
and
HAFT
residues
in/
on
potatoes
were
0.025
and
0.05
ppm,
respectively
(
Table
C.
4).
No
pattern
of
residue
decline
could
be
ascertained,
as
residues
were
<
LOQ
in
samples
from
each
interval
in
the
two
residue
decline
trials.
Bifenthrin/
128825/
BASF
DACO
7.4.1/
7.4.2/
OPPTS
860.1500/
OECD
IIA
6.3.1,
6.3.2,
6.3.3
and
IIIA
8.3.1,
8.3.2,
8.3.3
Crop
Field
Trial
 
Potatoes
DP#:
310089/
MRID#:
45794203
Page
8
of
9
Table
C.
3.
Residue
Data
from
Potato
Fields
Trials
with
Bifentrhin
Using
G
and
EC
Formulations.
Trial
ID
(
City,
State;
Year)
Zone
Potato
Variety
Commodity
Formulations1
Total
Rate
(
lb
ai/
A)
PHI
(
days)
Bifenthrin
residues
(
ppm)

G
+
EC
0.5
ND,
ND
Dundee,
NY;
2001
1
NY­
79
Tuber
EC
+
EC
0.5
21
ND,
ND
14
ND,
ND
21
ND,
ND
28
ND,
ND
G
+
EC
0.5
35
ND,
ND
14
ND,
ND
21
(
0.01),
(
0.02)
28
ND,
ND
North
Rose,
NY;
2001
1
NY­
79
Tuber
EC
+
EC
0.5
35
ND,
(
0.01)
G
+
EC
0.5
ND,
ND
Sunbury,
NC;
2001
2
Superior
Tuber
EC
+
EC
0.5
21
ND,
(
0.01)
G
+
EC
0.5
ND,
ND
Hobe
Sound,
FL;
2001
3
Red
Lasoda
Tuber
EC
+
EC
0.5
142
ND,
ND
G
+
EC
0.5
ND,
ND
Fitchburg,
WI;
2001
5
Superior
Tuber
EC
+
EC
0.5
20
(
0.02),
(
0.02)
G
+
EC
0.5
ND,
ND
Wahpeton,
ND;
2001
5
Kennebec
Tuber
EC
+
EC
0.5
21
ND,
ND
G
+
EC
0.5
ND,
ND
Center,
CO;
2001
9
Norkotah
Tuber
EC
+
EC
0.5
21
ND,
ND
G
+
EC
0.5
ND,
ND
Visalia,
CA;
2001
10
Cherry
Red
Tuber
EC
+
EC
0.5
21
ND,
ND
G
+
EC
0.5
(
0.01),
ND
Moses
Lake,
WA;
2001
11
Russet
Burbank
Tuber
EC
+
EC
0.5
21
ND,
ND
G
+
EC
0.5
ND,
ND
Walla
Walla,
WA;
2001
11
Russet
Burbank
Tuber
EC
+
EC
0.5
21
ND,
(
0.02)
G
+
EC
0.5
ND,
ND
Jerome,
ID;
2001
11
Russet
Burbank
Tuber
EC
+
EC
0.5
21
ND,
ND
14
ND,
ND
21
ND,
ND
28
ND,
ND
G
+
EC
0.5
35
ND,
ND
14
ND,
ND
21
ND,
ND
28
ND,
ND
Rupert,
ID;
2001
11
Russet
Burbank
Tuber
EC
+
EC
0.5
35
ND,
ND
1
The
in­
furrow
application
was
made
with
a
G
or
EC
formulation
and
all
foliar
applications
were
made
with
an
EC
formulation.
2
These
samples
were
harvested
early
due
to
a
blight
infestation.
ND
=
Not
detectible
(<
LOD
of
0.01
ppm)

TABLE
C.
4.
Summary
of
Residue
Data
from
Potato
Field
Trials
with
Bifenthrin
(
G
and
EC).
Residue
Levels2
(
ppm)
Commodity
Forms.
1
Total
Applic.
Rate
(
lb
ai/
A)
PHI
(
days)
n
Min.
Max.
HAFT3
Median
Mean
Std.
Dev.
G
+
EC
0.5
21
24
0.05
0.05
0.05
0.025
0.025
­
Potatoes
EC
+
EC
0.5
21
24
0.05
0.05
0.05
0.025
0.025
­
1
The
in­
furrow
application
was
made
with
a
G
or
EC
formulation
and
all
foliar
applications
were
made
with
an
EC
formulation.
2
For
calculating
the
mean,
median
and
Std.
Dev,
½
the
LOQ
was
used
for
residues
below
the
LOQ
3
HAFT
=
Highest­
Average
Field
Trial.
Bifenthrin/
128825/
BASF
DACO
7.4.1/
7.4.2/
OPPTS
860.1500/
OECD
IIA
6.3.1,
6.3.2,
6.3.3
and
IIIA
8.3.1,
8.3.2,
8.3.3
Crop
Field
Trial
 
Potatoes
DP#:
310089/
MRID#:
45794203
Page
9
of
9
D.
CONCLUSION
The
potato
field
trial
data
are
adequate
and
support
the
use
of
a
single
in­
furrow
application
of
bifenthrin
(
G
or
EC)
prior
to
planting
at
up
to
0.3
lb
ai/
A
and
up
to
two
late
season
foliar
applications
of
bifenthrin
(
EC)
at
0.1
lb
ai/
A/
application,
for
a
maximum
seasonal
rate
of
0.5
lb
ai/
A.

E.
REFERENCES
DP#:
283808
Subject:
Bifenthrin.
Residue
and
Product
Chemistry
Considerations
for
the
Tolerance
Reassessment
Eligibility
Decision
(
TRED)
From:
S.
Levy
To:
T.
Myers
Dated:
21­
AUG­
2002
MRID(
s):
None
F.
DOCUMENT
TRACKING
RDI:
RAB1
Chemists
(
16­
NOV­
2005)
Petition#:
3E6882
DP#:
310089
PC
Code:
128825
Template
Version
June
2005
