clethodim (Select) Pesticide Petition Filing 11/97
[Federal Register: December 3, 1997 (Volume 62, Number 232)]
>From the Federal Register Online via GPO Access [wais.access.gpo.gov]
ENVIRONMENTAL PROTECTION AGENCY
Notice of Filing of Pesticide Petitions
AGENCY: Environmental Protection Agency (EPA).
SUMMARY: This notice announces the initial filing of pesticide
petitions proposing the establishment of regulations for residues of
certain pesticide chemicals in or on various food commodities.
DATES: Comments, identified by the docket control number PF-780, must
be received on or before January 2, 1998.
ADDRESSES: By mail submit written comments to: Public Information and
Records Integrity Branch, Information Resources and Services Division
(7502C), Office of Pesticides Programs, Environmental Protection
Agency, 401 M St., SW., Washington, DC 20460. In person bring comments
to: Rm. 1132, CM #2, 1921 Jefferson Davis Highway, Arlington, VA.
Comments and data may also be submitted electronically to: opp-
email@example.com. Follow the instructions under ``SUPPLEMENTARY
INFORMATION.'' No confidential business information should be submitted
Information submitted as a comment concerning this document may be
claimed confidential by marking any part or all of that information as
``Confidential Business Information'' (CBI). CBI should not be
submitted through e-mail. Information marked as CBI will not be
disclosed except in accordance with procedures set forth in 40 CFR part
2. A copy of the comment that does not contain CBI must be submitted
for inclusion in the public record. Information not marked confidential
may be disclosed publicly by EPA without prior notice. All written
comments will be available for public inspection in Rm. 1132 at the
address given above, from 8:30 a.m. to 4 p.m., Monday through Friday,
excluding legal holidays.
FOR FURTHER INFORMATION CONTACT: The product manager listed in the
Product Manager telephone number Address
Joanne Miller (PM 23)......... Rm. 237, CM #2, 703- 1921 Jefferson
305-6224, e- Davis Hwy,
mail:miller.joanne@ep Arlington, VA
James Tompkins (PM 25)........ Rm. 239, CM #2, 703- 1921 Jefferson
305-5697, e-mail: Davis Hwy,
tompkins.james@epamai Arlington, VA.
SUPPLEMENTARY INFORMATION: EPA has received pesticide petitions as
follows proposing the establishment and/or amendment of regulations for
residues of certain pesticide chemicals in or on various food
commodities under section 408 of the Federal Food, Drug, and Comestic
Act (FFDCA), 21 U.S.C. 346a. EPA has determined that these petitions
contain data or information regarding the elements set forth in section
408(d)(2); however, EPA has not fully evaluated the sufficiency of the
submitted data at this time or whether the data supports granting of
the petition. Additional data may be needed before EPA rules on the
The official record for this notice of filing, as well as the
public version, has been established for this notice of filing under
docket control number [PF-780] (including comments and data submitted
electronically as described below). A public version of this record,
including printed, paper versions of electronic comments, which does
not include any information claimed as CBI, is available for inspection
from 8:30 a.m. to 4 p.m., Monday through Friday, excluding legal
holidays. The official record is located at the address in
``ADDRESSES'' at the beginning of this document.
Electronic comments can be sent directly to EPA at:
Electronic comments must be submitted as an ASCII file avoiding the
use of special characters and any form of encryption. Comment and data
will also be accepted on disks in Wordperfect 5.1 file format or ASCII
file format. All comments and data in electronic form must be
identified by the docket number (insert docket number) and appropriate
petition number. Electronic comments on notice may be filed online at
many Federal Depository Libraries.
List of Subjects
Environmental protection, Agricultural commodities, Feed additives,
Food additives, Pesticides and pests, Reporting and recordkeeping
Dated: November 21, 1997
Acting Director, Registration Division, Office of Pesticide Programs.
Summaries of Petitions
Petitioner summaries of the pesticide petitions are printed below
as required by section 408(d)(3) of the FFDCA. The summaries of the
petitions were prepared by the petitioners and represent the views of
the petitioners. EPA is publishing the petition summaries verbatim
without editing them in any way. The petition summary announces the
availability of a description of the analytical methods available to
EPA for the detection and measurement of the pesticide chemical
residues or an explanation of why no such method is needed.
1. Valent U.S.A. Corporation
EPA has received a pesticide petition (PP 7F4873) from Valent
U.S.A. Corporation, 1333 N. California Blvd., Walnut Creek, CA 94596.
proposing pursuant to section 408(d) of the Federal Food, Drug and
Cosmetic Act, 21 U.S.C. 346a(d), to amend 40 CFR part 180 by
establishing a tolerance for residues of clethodim in or on the raw
agricultural commodities tuberous and corm vegetables (crop subgroup 1-
C) at 1.0 parts per million (ppm), potato flakes/granules at 2.0 ppm,
sunflower seed at 5.0 ppm, sunflower meal at 10.0 ppm, canola seed at
0.5 ppm, and canola meal at 1.5 ppm. The crop subgroup 1-C tolerance
should replace the 0.5 ppm tolerance that already exists for clethodim
in/or potato tubers which was based on data from Canada. The
proposed analytical method for these commodities is EPA-RM-26D-3, a
high-performance liquid chromatography (HPLC) method. EPA has
determined that the petition contains data or information regarding the
elements set forth in section 408(d)(2) of the FFDCA; however, EPA has
not fully evaluated the sufficiency of the submitted data at this time
or whether the data supports granting of the petition. Additional data
may be needed before EPA rules on the petition.
A. Residue Chemistry
1. Plant metabolism. Clethodim is used for postemergent control of
grasses in a wide variety of crops including cotton, soybeans, sugar
beets, onions, tomatoes, etc. Plant metabolism studies have been
performed in carrots, soybeans, and cotton. Studies were performed with
clethodim radiolabeled in the ring structure and in the side chain to
follow both parts of the molecule.
The major metabolic pathway in plants is initial sulfoxidation to
form clethodim sulfoxide followed by further sulfoxidation to form
clethodim sulfone; elimination of the chloroallyloxy side chain to give
the imine sulfoxide and sulfone; and hydroxylation to form the 5-OH
sulfoxide and 5-OH sulfone. Clethodim sulfoxide and clethodim sulfone
conjugates were also detected as major or minor metabolites, depending
on plant species and subfractions. Once cleaved from clethodim, the
chloroallyloxy moiety udergoes extensive metabolism to eliminate the
chlorine atom and incorporate the three-carbon moieties into natural
Based on these metabolism studies, the residues of concern in crops
are clethodim and its metabolites containing the cyclohexene moiety,
and their sulfoxides and sulfones.
2. Analytical method. Adequate analytical methodology is available
for detecting and measuring levels of clethodim and its metabolites in
crops. For most commodities, the primary enforcement method is EPA-RM-
26D-3, an HPLC method capable of distinguishing clethodim from the
structurally related herbicide sethoxydim. However, for milk natural
interferences prevent adequate quantitation of clethodim moieties and
the common-moiety method (RM-26B-2) is the primary enforcement method
with EPA-RM-26D-3 as the secondary method if needed to determine
whether residues are clethodim or sethoxydim. Both of these methods
have successfully undergone petition method validations at EPA.
3. Magnitude of residues. Clethodim is the active ingredient in
SELECT 2 EC Herbicide (EPA Reg. No. 59639-3) and SELECT Herbicide (also
known as PRISM and ENVOY Herbicides, EPA Reg. No. 59639-78). Tolerances
have been established for residues in cotton, soybean, sugar beet,
onion (dry bulb), and animal commodities, and tolerances are expected
soon for alfalfa, peanut, dry bean, and tomato commodities. A summary
of available field residue data for the pending tolerances on tuberous
and corm vegetables (crop subgroup 1-C), sunflower, and canola
commodities is presented below.
In 17 field trials, potatoes were treated with two post-emergent
applications of 0.25 lb. a.i./A each, approximately 14-days apart, and
harvested approximately 30 days after the last application. Trials were
performed in EPA Regions 1, 2, 3, 5, 9, 10, and 11. Residues for potato
tuber samples ranged from < 0.1 ppm to 0.80 ppm total clethodim. The
highest average field trial (HAFT) residue was 0.775 ppm. The average
residue value for all trials, excluding samples less than the limit of
detection, was 0.42 ppm. Two processing studies were also performed for
potatoes. Residues were found to concentrate in flakes, but not wet
peel or chips. The average concentration factor for flakes was 2.4.
Since potato is the only representative crop for crop subgroup 1-C per
40 CFR 180.41, these data support time-limited tolerances of 1.0 ppm in
tuberous and corm vegetables (crop subgroup 1-C) and 2.0 ppm in flakes/
In 8 field trials, sunflowers were treated with two post-emergent
applications of 0.25 lb. a.i./A each. Sunflower seeds were harvested 56
to 72 days after the last application. Trials were performed in EPA
Regions 5, 7, and 8. Residues for sunflower seed samples ranged from
0.46 ppm to 4.4 ppm total clethodim. The highest average field trial
(HAFT) residue was 4.2 ppm. The average residue level was 1.6 ppm. A
processing study was also performed for sunflowers. Residues were found
to concentrate in meal, but not in refined oil. The concentration
factor for meal was 2.1. These data support tolerances of 5.0 ppm in
sunflower seed and 10.0 ppm in sunflower meal.
In 18 field trials, canola or rape was treated with one post-
emergent application of 0.11 to 0.32 lb. a.i./A and harvested
approximately 70 to 98 days after the application. Most of the trials
were performed in Canada in growing regions adjacent to the U.S. areas
where canola is grown. These data were used to support a maximum
residue level in Canada and are being cited in order to harmonize
maximum residue levels between the U.S. and Canada and remove the
existing trade barrier. Residues in canola seed samples ranged from <
0.05 ppm to 0.54 ppm. The highest average field trial (HAFT) residue
was 0.505 ppm. The average residue value for all trials, including
samples less than the limit of detection at one-half the limit, was
0.162 ppm. A processing study was also performed for canola and
residues were found to concentrate in meal, but not in crude oil. Since
the highest residues were the result of application rates higher than
those proposed for the U.S., these data support tolerances of 0.5 ppm
in canola seed and 1.5 ppm in canola oil.
B. Toxicological Profile
1. Acute toxicity. Clethodim Technical is slightly toxic to animals
following acute oral (Toxicity Category III), dermal (Toxicity Category
IV), or inhalation exposure (Toxicity Category IV under current
guideline interpretation). Clethodim is a moderate eye irritant
(Category III), a severe skin irritant (Category II), and does not
cause skin sensitization in the modified Buehler test in guinea pigs.
In addition, an acute oral no-observed effect level (NOEL) has been
determined in rats to be 300 milligrams/kilograms (mg/kg). Since this
NOEL is significantly higher than the lowest chronic NOEL of 1 mg/kg/
day, chronic exposures are expected to be of the most concern and this
summary will focus on repeated exposures.
2. Genotoxicty. Clethodim Technical did not induce gene mutation in
microbial in vitro assays. A weak response in an in vitro assay for
chromosome aberrations was not confirmed when clethodim was tested in
an in vivo cytogenetics assay up to the maximally tolerated dose level,
nor was the response observed in vitro using technical material of a
higher purity. No evidence of unscheduled DNA synthesis was seen
following in vivo exposure up to a dose level near the LD<INF>50</INF>
(1.5 g/kg). This evidence indicates that clethodim does not present a
genetic hazard to intact animal systems.
3. Reproductive and developmental toxicity. No reproductive
toxicity was observed with Clethodim Technical at feeding levels up to
2,500 ppm. Developmental toxicity was observed in two rodent species,
but only at maternally toxic dose levels. In rats, the developmental
NOEL was 300 mg/kg/day while the maternal toxicity NOEL was only 150
mg/kg/day. In rabbits, the developmental NOEL was >300 mg/kg/day and
the maternal NOEL was only 25 mg/kg/day. Valent therefore does not
consider clethodim to be a reproductive or developmental hazard. These
studies also indicate that clethodim does not adversely affect
4. Subchronic toxicity. High doses of Clethodim Technical cause
decreased body weights, increased liver size (increased weight and cell
hypertrophy), and anemia (decreased erythrocyte counts, hemoglobin, or
hematocrit) in rats and dogs. No observable effect levels have been
determined to be 100 mg/kg/day for a 4-week dermal study in rats, 200
to 1,000 ppm for 4- or 5-week feeding studies in rats or mice, 500 ppm
in a 13-week feeding study in rats, and 25 mg/kg/day in a 90-day oral
study in dogs.
5. Chronic toxicity and oncogenicity. In chronic studies conducted
in rats, mice, and dogs, compound-related effects noted at high doses
included decreased body weight, increased liver size (liver weight and
hypertrophy), and anemia (decreased hemoglobin, hematocrit, and
erythrocyte count). Bone marrow hyperplasia was observed in dogs at the
highest dose tested. No treatment-related increases in incidence of
neoplasms were observed in any study. Chronic NOELs were 200 ppm for an
18-month feeding study in mice and 500 ppm for a 24-month study in
rats. The lowest NOEL is from the 1-year oral dog study and is 1 mg/kg/
day clethodim technical. Based on this study and a 100-fold safety
factor, the reference dose (RfD) for clethodim was determined to be
0.01 mg/kg/day. Valent believes that clethodim is not carcinogenic.
These studies also indicate that clethodim does not adversely affect
6. Animal metabolism. The in vivo metabolism of clethodim in rats
was tested at a high dose (468 mg/kg), low dose (4.4 mg/kg), and a low
dose (4.8 mg/kg) following 14-days of treatment with Clethodim
Technical. A single oral dose of [14C]-clethodim was given to each rat
and expired carbon dioxide and excreta were collected over the next 2-
and 7-days, respectively, to determine radiolabel recovery. Several
organs and tissues, and the remaining carcass, were collected after
sacrifice to determine radiolabel recovery. In all treatment groups,
nearly all of the radiolabel was eliminated in the urine (87-93%),
feces (9-17%), and carbon dioxide (0.5-1%) and less than 1% of the dose
was recovered in the organs and tissues after 7- days.
Elimination was rapid as most of the recovered dose was eliminated
within 48 hours. The low dose groups eliminated clethodim slightly
faster than the high dose group, and repeated exposure to clethodim
prior to radiolabel dosing did not affect the rate of elimination or
distribution of recovered radiolabel. There were no apparent sex
differences with respect to elimination or distribution of metabolites.
The primary excretory metabolites were identified as clethodim
sulfoxide (48-63%), clethodim S-methyl sulfoxide (6-12%), clethodim
imine sulfoxide (7-10%), and clethodim 5-hydroxy sulfoxide (3-5%).
Minor metabolites included clethodim oxazole sulfoxide (2-3%),
clethodim trione sulfoxide (1%), clethodim (1%), clethodim 5-hydroxy
sulfone (0.3-1%), clethodim sulfone (0.1-1%), aromatic sulfone (0.2-
0.7%), and S-methyl sulfone (0-0.4%).
7. Dermal penetration. The dermal penetration of SELECT 2 EC
Herbicide, the end-use product, was tested on unabraded, shaved skin of
rats. Single doses of approximately 0.05, 0.5, and 5.0 mg of
radiolabeled (14C-clethodim) SELECT 2 EC Herbicide, were applied
topically to 10 cm<SUP>2</SUP> sites on the dorsal trunk. After 2, 10,
or 24 hours, urine, feces, volatiles, scrubbings of the skin, skin at
treatment site, blood, several tissues, and the carcass were collected
and counted for radioactivity. Clethodim was found to be slowly
absorbed through the skin in a time-dependent manner. The percent of
dose absorbed increased with length of exposure and decreased with
increasing dose. 10-hour absorption rates ranged from 7.5% to 30.0%.
Most of the absorbed material was found in the urine and carcass, and
most of the unabsorbed material was found in the skin scrubbings
indicating that material was still on the skin surface.
8. Metabolite toxicology. 2 metabolites of clethodim, clethodim
imine sulfone (RE-47719) and clethodim 5-hydroxy sulfone (RE-51228),
have been tested in toxicity screening studies to evaluate the
potential impact of these metabolites on the toxicity of clethodim. In
general, these metabolites were found to be less toxic than Clethodim
Technical for acute and oral toxicity studies; reproduction and
teratology screening studies; and several mutagenicity studies.
C. Aggregate Exposure
1. Dietary exposure--i. Food. Clethodim is approved for use in the
production of commercial agricultural crops including cotton, soybeans,
sugar beets, and onions (dry bulb). Approval is expected soon for
several additional crops. Dietary exposures are expected to represent
the major route of exposure to the public. Since chronic exposures are
of more concern than acute exposures for clethodim, this summary will
focus primarily on chronic issues. Chronic dietary assessments for
clethodim have been conducted by the registrant for all currently
approved crops, all pending crops, and the crops proposed in this
petition (tuberous and corm vegetables, sunflower, and canola).
In Valent's assessment, anticipated residues were used for all crop
and animal commodities. Anticipated residue levels were the mean levels
found in crop field trial data after treatment with the maximum
recommended rate and harvested at minimum allowable intervals. These
values are, therefore, slightly conservative. An assessment was
performed assuming 100% of crop treated (still conservative) as well as
assuming a more realistic percent of crop treated based on market
survey data for existing uses or market projections for proposed uses.
Adjusting for percent of crop treated is justified because most of
treated commodities are combined in central locations and broadly
distributed to the public; none of the clethodim tolerances or uses are
limited to specific regions in the U.S.; and the primary concern is
with chronic dietary exposure which minimizes the variance of single
serving residues. The results of these assessments are summarized below
in the Safety Determination section and indicate that chronic dietary
exposures for existing and proposed uses of clethodim are well below
the reference dose in either case.
ii. Drinking water. Since clethodim is applied outdoors to growing
agricultural crops, the potential exists for clethodim or its
metabolites to leach into groundwater. Drinking water, therefore,
represents a potential route of exposure for clethodim and should be
considered in an aggregate exposure assessment.
Based on available studies used in EPA's assessment of
environmental risk for clethodim (memo from E. Brinson Conerly dated
June 26, 1990), clethodim itself was classified as mobile in soil, but
very non-persistent, representing a minimal groundwater concern.
Metabolites of clethodim were also classified as mobile, but are
slightly more persistent (half-lives up to 30-days versus up to 3-days
for parent). Regarding clethodim metabolites, the Agency concluded that
the ``potential for groundwater contamination may be somewhat higher
than for clethodim but would still be expected to be relatively low in
most cases due to their moderately low persistence''.
There is no established Maximum Concentration Level for residues of
clethodim in drinking water under the Safe Drinking Water Act.
Based on this information, Valent believes that clethodim appears
to represent an insignificant risk for exposure through drinking water.
2. Non-dietary exposure. Clethodim is currently approved for the
commercial production of agricultural crops including soybeans, cotton,
sugar beets, onions, and ornamental plants as well as for use on non-
crop areas. The new uses proposed in this notice of filing are all
agricultural crops. While there is a potential for clethodim to be used
in non-crop areas (e.g. around parks and rights-of-way) where the
public does spend some time, the likelihood of significant exposure is
very small. First, this grass herbicide cannot be sprayed on lawns
where the public does spend significant amounts of time, but instead
must be used where there is no crop or around ornamental plants that
are tolerant to the chemical. The public does not spend significant
amounts of time in these areas. And second, clethodim is not persistent
in the environment so the potential for public exposure is short term.
Therefore, Valent believes that the potential for non-occupational
exposure to the general public, other than through the diet or drinking
water, is insignificant.
D. Cumulative Effects
There is one other pesticide compound registered in the United
States, sethoxydim, which is structurally related to clethodim and has
similar effects on animals. Sethoxydim is approved for use on a variety
of agricultural crops, in non-crop areas, and around the home. This
chemical should be considered in an aggregate exposure assessment along
with clethodim. Dietary exposure is expected to represent the major
route of exposure for sethoxydim as well as for clethodim.
The reference dose for sethoxydim is 0.09 mg/kg/day based on the 1-
year dog feeding study NOEL and a 100-fold safety factor. This in on
the same order of magnitude as clethodim, 0.01 mg/kg/day, which is also
based on a 1-year dog study and a 100-fold safety factor.
A discussion of the cumulative effects from clethodim and
sethoxydim exposures is presented below in the Safety Determination
E. Safety Determination
1. U.S. population. Using the dietary exposure assessment
procedures described above for clethodim, chronic dietary exposures
resulting from existing and proposed uses of clethodim were compared to
the reference dose (RfD) of clethodim. In Valent's conservative
assessment (using anticipated residues and assuming 100% treated for
all crops), exposure for the U.S. population would occupy 13.6% of the
RfD and non-nursing infants (< 1-year) are most highly exposed with
total exposure occupying 32.3% of the RfD. Exposure to children 1 to 6
years old would occupy 27.1% of the RfD. In Valent's realistic analysis
(using anticipated residues and estimated percent of crop treated for
all crops), exposure for the U.S. population would occupy only 0.6% of
the RfD and non-nursing infants are still the highest and would be at
only 1.6% of the RfD.
For sethoxydim, recent EPA dietary assessments have been performed
in conjunction with the extension of several time-limited tolerances.
In a Final Rule published in the Federal Register of April 11, 1997 (62
FR 17735) (FRL-5598-7), EPA estimated that exposure to all existing
tolerances for sethoxydim would occupy 36% of the sethoxydim RfD for
the U.S. population and 72% of the RfD for the most exposed
subpopulation of children aged 1- to 6-years. The assumptions used were
conservative and the final rule stated that ``actual risks using more
realistic assumptions would likely result in significantly lower risk
Since clethodim and sethoxydim have similar toxicological effects
in mammals, the contributions to the individual reference doses may
need to be considered in an aggregate exposure assessment. The EPA
generally has no concern for exposures below 100% of the RfD because
the RfD represents the level at or below which daily aggregate exposure
over a lifetime will not pose appreciable risks to human health.
Directly summing the results of the conservative sethoxydim and the
conservative clethodim contributions to RfD would be approaching 100%.
However, reliable information is not available to indicate that
directly summing the percent of RfD for these two chemicals is the most
appropriate thing to do. Since using realistic assumptions for
clethodim, including adjustment for percent of crop treated, result in
large decreases in dietary risk (about 20-fold) Valent expects that the
sethoxydim risk estimates would also be reduced significantly.
Therefore, Valent believes that the cumulative chronic dietary risk of
sethoxydim and clethodim is likely to be well below the 100% level for
all population subgroups.
Regarding drinking water exposures, sethoxydim is similar to
clethodim representing a minimal risk for leaching into groundwater due
to its rapid degradation in the environment. There is no established
Maximum Concentration Level for residues of sethoxydim in drinking
water under the Safe Drinking Water Act.
Regarding non-occupational exposures, sethoxydim is registered for
use in non-crop areas and around the home and may have some potential
for exposure to the general public. However, as discussed for
clethodim, sethoxydim cannot be applied to grass where public contact
is expected and sethoxydim is not persistent in the environment. Valent
therefore expects that non-occupational exposures to the public be
minimal for sethoxydim.
In summary, dietary exposure for clethodim and sethoxydim are each
expected to occupy less than 10% of their RfD's when anticipated
residue levels and percent of crop treated values are considered.
Exposures through the drinking water or other non-occupational routes
are expected by Valent to be minimal. Collectively, Valent believes
that the aggregate risks associated with the uses of these two
chemicals is small and demonstrates a reasonable certainty of no harm
to the public.
2. Infants and children. As discussed above, dietary exposure for
clethodim and sethoxydim is greatest for children ages 1-6-years or
non-nursing infants less than 1-year old. However, using a realistic
approach to estimating exposures, exposures are expected to be below
10% of the RfD for each chemical even for infants and children. The
databases for clethodim and sethoxydim are complete relative to current
pre- and post-natal toxicity testing requirements including
developmental toxicity studies in two species and multi-generation
reproduction studies in rats. Reproduction and developmental effects
have been found in toxicology studies for clethodim and sethoxydim, but
the effects were seen at levels that were also maternally toxic. This
indicates that developing animals are not more sensitive than adults.
FQPA requires an additional safety factor of up to 10 for chemicals
which represent special risks to infants or children. Clethodim and
sethoxydim do not meet the criterion for application of an additional
safety factor for infants and children. Valent believes that this
demonstrates a reasonable certainty of no harm to children and infants
from the proposed uses of clethodim.
F. International Tolerances
Although some have been proposed, there are no Mexican or Codex
tolerances or maximum residue limits established for clethodim on
potatoes, sunflower, or canola commodities. In
Canada, there are maximum residue limits established for potato tubers
at 0.5 ppm and canola oil at 0.1 ppm. The use rates proposed for the
use on tuberous and corm vegetables (crop subgroup 1-C) may exceed the
0.5 ppm level in tubers so a higher level is necessary. In Canada,
canola oil is the only canola commodity considered for a residue limit
since this is the commodity consumed by humans. In the U.S., a
tolerance is not being proposed for the processed commodity canola oil
since concentration did not occur in the processing study.
Consequently, residue in oil up to 0.5 ppm would be allowed in the U.S.
However, the residue data indicate that residues in oil are not
expected to exceed 0.1 ppm and Valent does not believe this would
represent a barrier against exporting U.S.-treated canola oil into
[FR Doc. 97-31542 Filed 12-2-97; 8:45 am]
BILLING CODE 6560-50-F