UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

WASHINGTON D.C., 20460

	

PC Code: 128810

DP Barcode: 362960, 362957

Chemical: Azoxystrobin  

DATE:	     June 10, 2009

MEMORANDUM

SUBJECT:	Drinking and Aquatic Exposure Water Assessment for amended
label Dynasty® fungicide (EPA Reg. No. 110-1159) Azoxystrobin on
sorghum and head and stem Brassica (cole) crops.

TO:	Tony Kish, PM 22 (7505P)

John Bazuin, Risk Manager Reviewer (7505P)

Registration Division, Fungicide Branch

FROM:	James K. Wolf, Environmental Scientist

Environmental Risk Branch 3

	Mark Corbin, Senior Environmental Scientist

Environmental Risk Branch 3

Dana Spatz, Branch Chief

Environmental Risk Branch 3

Environmental Fate and Effects Division (7507C)

Syngenta Crop Protection has petitioned to amend the labeling for
Dynasty® (EPA Registration No. 100-1159) to allow for seed treatment
use on sorghum and the head and stem subgroup 5A of Brassica (cole)
leafy vegetables (crop group 5). The active ingredient in Dynasty is
azoxystrobin (CAS No. 131860-33-8) This memo describes the Tier 2
estimated drinking water concentrations (EDWCs) for azoxystrobin in
surface water and Tier 1 in ground water from the proposed amendments to
the current label. 

μg/L (ppb), 0.005 µg/L, and 0.0032 μg/L, for the peak, annual mean
and overall mean concentrations, respectively. The highest
concentrations occurred with the sorghum scenario. The estimated ground
water concentration is 9.9e-04 μg/L. For the previously assessed uses,
azoxystrobin was applied by ground or aerial spray, chemigation, and to
soil (soil borne control).  It should be noted that these EDWCs are
significantly lower than those estimated for previous uses such as turf
(D285061, EFED Review dated 11/05/02).  The EDWCs are also provided
(Table 2) for the previous assessment on head and stem brassicas
(broccoli).  

Table 1. Estimated Drinking Water Concentrations (EDWC) of azoxystrobin
residues for Head and stem brassica (leafy vegetables Subgroup 5A) and
sorghum in an Index Reservoir with the linked PRZM and EXAMS models. 
The simulations use the highest rate proposed for the seed treatment
uses, 0.00049 and 0.002 lb ai/acre for subgroup 5A and sorghum,
respectively.   The concentrations have been
adj獵整⁤楷桴琠敨倠牥散瑮䌠潲⁰牔慥整⁤倨䅃 景〠
㠮‷潦⁲⁡慮楴湯污愠獳獥浳湥⹴܇܍

 1-in-10 year Azoxystrobin Concentration (μg/L)	

 Concentration (μg/L)



Scenario -State Crop – Seed treatment 	

Peak	

Annual Mean	

Overall Annual  Mean

FL-Cabbage - Subgroup 5A	0.010	0.002	0.001

KS Sorghum - Sorghum 	0.015	0.005	0.003

1 The bold values represent the recommend EDWCs to be use in the
drinking water assessment.

The EDWCs drinking water concentrations for the seed treatment were less
than the previously determined, by the FIRST model for the turf and
broccoli uses (Table 2).  The application rates previous considered
(Table 2) are considerably less the rate proposed for seed treatment.
Therefore, EFED recommends that the drinking water concentrations
previously used by HED be retained.  

Table 2.  Estimated Drinking Water Concentrations (EDWC) of azoxystrobin
residues for Head and stem brassica (leafy vegetables Subgroup 5A) and
Turf with the FIRST and SCI-GROW (surface and ground water,
respectively) models from previous assessments.  (D285061, 11/05/02).

MODEL	FIRST  (µg/L)	SCI-GROW (µg/L)	Application Rate 	Repeat Interval

 Crop	Peak (Acute) 	Annual Average 	Acute/chronic	 (lb ai/acre)	(days)

Turf	173	33	3.10 	9 apps @ 0.55	10

Broccoli	54	10	0.95	6 apps @ 0.25	14



 

Use Characterization

The active ingredient in the fungicide Dynasty® is azoxystrobin.
Azoxystrobin is a broad spectrum seed treatment fungicide for control of
seed and seed-borne diseases.  The uses considered in this assessment
belong to the Head and Stem Subgroup of the Brassica (cole) crop group
broccoli, Brussel’s sprouts, cabbage, cauliflower, cavolo broccoli,
Chinese broccoli, Chinese cabbage (napa), and kohirabi, and Sorghum.  

The use rates proposed for the seed treatment are summarized in Table 3.
 The application rates range from 0.000013 lb ai/acre to 0.0020 lb
ai/acre.  



Table 3.  Previously assessed crops, maximum application rate and
maximum season application for azoxystrobin (Dynasty®)1 as a seed
treatment.

	Seed Treatment Application



Crop 	Use Rates

(fl. oz prod/100 lb seed)	Seeding Rate   	Maximum Rate  

 (lbs ai/acre)

Crop Group 5A2. Head and Stem Brassica subgroup	0.10 to 3.75	2 lb
seed/acre	0.00049

Sorghum	1.54 to 3.08	10 lb seed/acre	0.00200

Sorghum	0.0031 – 0062 mg ai/seed	(based upon 14500 seeds/lb)	0.00198

1. 9.6 % ai and 0.83 lbs ai/gallon

2 Crop Subgroup 5-A. Head and Stem Brassica (broccoli, Chinese broccoli,
Brussels sprouts, cabbage, Chinese cabbage (napa), Chinese cabbage
mustard, cauliflower. Cavalo broccolo, kohlrabi). 

 Previously approved uses, including turf, had application rates ranging
from 0.25 to 0.53 lb ai/acre with a seasonal maximum of up to 5.0 lb
ai/acre.  The reapplication intervals ranged from of 14 to 28 days
(D285061).  Other rates for a variety of crops have also been considered
by the Agency (Appendix 1, Table 1). Application rates ranged from 0.1
to 0.25 lb ai/acre per application with seasonal totals of ranging from
0.45 to 5.0 lb ai/acre (D301948).  Methods of application include ground
and aerial spray.

Chemical Name: methyl
(E)-2-{2-[6-(6-2-cyanophenoxy)pyrimidin-4-yloxy]pheny}-3-methoxyacrylate
. 

the pesticide class of compounds called β-methoxyacrylates, which are
derived from the naturally occurring strobilurins.  Their biochemical
mode of action is inhibition of electron transport.

Environmental Fate and Transport:

Azoxystrobin is relatively persistent, but not highly mobile (D218292). 
Azoxystrobin is stable to hydrolysis at pH 5, 7, and 9 at 25 (C. 
Azoxystrobin degrades through photolysis in water and soil and to a
lesser extent by microbial-mediated degradation.  The dissipation
half-life (T½) of azoxystrobin by photolysis on soil ranges between =
17.6 to 28.4 days (DT50=11 days).   The dissipation of azoxystrobin by
photodegradation half-life in the surface waters ranges between 11.1 to
17 days).  Azoxystrobin will slowly under go biotransformation in
aerobic and anaerobic soils. The aerobic soil metabolism half-lives
range from 72 to 164 days. Three major degradates were detected. The
Health Effects Division (HED) has previously determined that the only
residue of concern for dietary exposure is parent azoxystrobin.  Thus,
only the parent was considered in this drinking water assessment.

The soil/water partitioning coefficients (Kads) for azoxystrobin ranged
from 1.5 to 23 mL/g in seven soils (Table 4). The Koc, Kads, and soil
textural classifications are given in Table 4.  Azoxystrobin exhibits a
low to moderate mobility in all soils tested in the mobility studies. 
The relatively low mobility was confirmed in the field studies where
azoxystrobin dissipated slowly on the surface (0-6 inch) of non-flooded
soils.  No azoxystrobin residue was found in soil layers deeper than 6
inches. Azoxystrobin is expected to have a high to moderate mobility in
runoff and low to moderate potential to leach. The data suggest that
azoxystrobin may be transported to surface and ground waters under some
use conditions.

Based on environmental fate data, the dissipation of azoxystrobin
appears to be predominately dependent on photodegradation and to a
lesser extent microbial-mediated degradation, and possible mobility to
surface and ground waters.  Azoxystrobin should be moderately persistent
to persistent in aerobic mineral soils.  Azoxystrobin is expected to
have a high to moderate mobility in runoff and low to moderate potential
to leach. The data suggest that azoxystrobin may be transported to
surface and ground waters under some use conditions.

Since photodegradation is a major route of degradation for azoxystrobin,
the dissipation of azoxystrobin is expected to be dependent on condition
of the water (e.g., sediment loading, depth, etc.) affecting sunlight
penetration.  For example, azoxystrobin should not persist in clear
shallow water bodies, but will be more persistent in turbid and/or
deeper waters, particularly those with long hydrological residence times

Due the low vapor pressure and burial of treated seeds when planted,
volatilization is not expected to be an important route of dissipation. 
Spray drift, foliar dissipation, and wash-off are also not expected due
to the treatment and burial of seeds.  It is also assumed that the
intent is to bury all seed, which would minimize the presence of ai at
the surface and keep losses due to runoff at minimum. 



Table 4. Textural class, Kads, and Koc for six soils (MRID 43678178,
MRID 43678181)



Texture class	

Kads (mL/g)	

Koc (mL/g)



sand	

1.5	

540



loamy sand	

2.9	

1490



loamy sand	

4	

240



sandy loam	

6.2	

210



silty clay loam	

9.5	

580



clay loam	

15	

540



silty clay loam	

23	

1690



No aerobic aquatic metabolism half-life was reported for azoxystrobin.
However, since azoxystrobin is also stable to hydrolysis, an aerobic
aquatic half-life equal to two times the aerobic soil metabolism
half-life was assumed in accordance with current EFED policy (EFED,
2002). A supplemental anaerobic aquatic metabolism study suggests that
azoxystrobin may be less persistent under anaerobic conditions. For
aquatic photolysis, since two half-life values were reported, the 90th
percent upper bound on the mean was used in order to simulate the
highest amount of azoxystrobin available for runoff.

Additional information concerning the aquatic metabolism would allow for
more certainty concerning estimated azoxystrobin residues in surface
water.  Because the treated seeds are buried during planting foliar
dissipation and wash-off are assumed not to be routes of dissipation.
The environmental fate data and values used in water modeling are
summarized in Table 5.  The seeding depths tend to range between 0.25 to
2 inches (0.65 to 5.0 cm) depending upon the crop (Table 5).  The
chemical application method (CAM) used in PRZM is 5, which is soil
applied at a user defined depth, linearly decreasing with depth.  

The seed were plant (application date) October 5 for cabbage and May 5
for sorghum.

Table 5. Summary of environmental fate parameters for azoxystrobin and
values used for modeling.

Parameter	Range	Value Used in Model	Source

Solubility in water	6.7 mg/L	6.7 mg/L	D218292

EFGWB One-Liner

Vapor Pressure  	8.2 x 10-13 torr	8.2 x 10-13 torr	D218292

Hydrolysis T½ (at 25 (C) 	stable at pH5, 7, 9	0 days	MRID 43678172

EFED. 2002

Aquatic Photolysis T½	T½ = 11 and 17 days	23.23 (90th percent upper
confidence bound on mean  T½	MRID 43678173

Soil Photolysis	DT50 = 11 days

T½ = 17.6 to 28.4 days. 	Not currently used in PRZM	MRID 43678174

Aerobic Soil Metabolism T½	72, 85, 164 days

mean = 107 days

std   = 49.79

median = 85	(SCI-GROW)

mean = 85 days

(PRZM/EXAMS)

90 percent upper bound on mean = 161.2 day	MRID 43678175

 EFED. 2002

Aerobic Aquatic Metabolism T½	none available	2 x aerobic soil
metabolism

2 x 161.2 = 322.2 days	EFED, 2002

Anaerobic Aquatic Metabolism, T½	50 to 59 days

(soil-water system)	62.3 days 90 % upper bound	 MRID 43678175

 (Supplemental)

Sorption Kads	1.5, 2.9, 4.0, 6.2, 9.5, 15, and 23 mL/g; mean – 8.87
mL/g	6.2 (lowest non-sand) 	MRID 43678178

MRID 43678181

EFED. 2002

Sorption Koc	210, 240, 540, 580, 1490, 1690 mL/g	210 mL/g (lowest
non-sand) 	MRID 43678178

MRID 43678181

U.S. EPA. 2002a

Spray Drift	

	 Assumed to be 0	EFED. 2002

Application Efficiency	

	1.0 as seed is buried	EFED. 2002

Foliar Wash-Off	Not applicable	0   (FEXTRA)	EFED. 2002

Foliar Dissipation	Not applicable	0  (PKDKRT)	EFED. 2002

CAM (chemical application method)	5 soil applied 	increasing with depth

	DEPI (depth of soil incorporation)	Brassica crops: 0.25 – 0.5 inch

Sorghum: 1-2 inches	Broccoli – 2 cm

Sorghum – 3 cm	  HYPERLINK
"http://aggie-horticulture.tamu.edu/extension/vegetable/cropguides/brocc
oli.html" 
http://aggie-horticulture.tamu.edu/extension/vegetable/cropguides/brocco
li.html 

  HYPERLINK
"http://www.uaex.edu/Other_Areas/publications/PDF/MP297/2_cultural_pract
ices.pdf" 
http://www.uaex.edu/Other_Areas/publications/PDF/MP297/2_cultural_practi
ces.pdf 

  HYPERLINK "http://www.ag.ndsu.nodak.edu/carringt/agalerts/milo.htm" 
http://www.ag.ndsu.nodak.edu/carringt/agalerts/milo.htm 



Simulation Modeling

There is no monitoring data available.  Thus, water assessment must use
modeled estimates.

Surface Water 

For Tier 2 surface-water assessments, two models are used, PRZM and
EXAMS.  PRZM simulates pesticide transport as a result of runoff and
erosion from a standardized watershed and EXAMS estimates environmental
fate and transport of pesticides in surface waters.  The version of PRZM
(Carsel et al., 2005) used was PRZM 3.12.2, dated May 2005. For
agricultural applications, the water body is simulated with EXAMS
version 2.98.4.6, dated August, 2007 (Burns, 2004).  PRZM and EXAMS were
linked using the PE5.pl shell, dated August, 2007,  which also
summarizes the output.

For further information on these models see,
http://www.epa.gov/oppefed1/models/water/index.htm

The Tier 2 assessment reports the EDWCS (drinking water) for
azoxystrobin that are expected once every ten years.  The estimates are
generated using 30-years of meteorological data, encompassing the years
from 1961 to 1990.  

The Index Reservoir (IR) is the water body used in drinking water
exposure assessment.  The IR allows for flow rates have been modified to
reflect local weather conditions. The index reservoir (IR)  is
approximately 82 m wide and 640 m long, with an area of 5.3 ha. (USEPA,
2000).  The area of the entire watershed is 172.8 ha.  Guidance for
using the IR is located at: http://www.epa.gov/pesticides/trac/science/.
 

The azoxystrobin concentrations simulated by PRZM/EXAMS assume that 100%
of the watershed is planted to the simulated crop.  The raw PRZM/EXAMS
concentrations (output) are then multiplied by the PCA (percent crop
area) to account for the less 100% coverage by the crop in watershed
large enough to support a drinking water facility.  The PRZM/EXAMS
output concentrations multiplied by the PCA are the estimated drinking
water concentration (EDWC).   PCAs are the maximum proportion of a
drinking water basin that might be planted to a specific crop (EFED,
2000).  The PCA (percent crop area) for all crops modeled was the EFED
default PCA value of 0.87.  The PCA is the maximum proportion of a
drinking water basin that might be planted to a specific crop (EFED,
2000).

 

Guidance for using PCAs and a thorough discussion of this method and
comparisons of monitoring and modeling results for selected
pesticide/crop/site combinations is located at:
http://www.epa.gov/pesticides/trac/science/.

	Because the application rate is based upon pounds of seed (i.e., fl oz
per lb seed), the assessment assumes that 100 percent of the ai comes
off the seed and is available for runoff or leaching.  Thus, amount of
“ai” per acre may be overestimate.  

Scenario Selection

A critical component of Tier 2 modeling is the selection of the scenario
for each crop.  The scenario to a large extent determines the extent of
risk that is assessed in the risk assessment. The goal in development of
scenarios is to select scenario parameters such that the scenario
modeled produces higher EECs than 90% of the sites that could be used to
grow a specific crop. These scenarios are selected by best professional
judgment so there is imprecision relative to that goal.  The
environmental concentrations for surface water use a single or multiple
sites which typically represent a high-end exposure (standard) scenario
from pesticide use on a particular crop or noncrop use site (Leovey,
2002).  Two standard scenarios were considered in this assessment KS
sorghum and FL Cabbage.

Previous azoxystrobin assessments consider application by ground or
aerial spray, chemigation, and to soil (soil borne control).  This
assessment only considers seed treatment for sorghum and the head and
stem subgroup (5A) of the brassicas (cole) leafy vegetable crops.   

Output from PRZM and EXAMS using the PE5.pl for the two scenarios are
located in Appendix 2.



Table 6.  Scenarios used to represent crops for Tier 2 modeling of
azoxystrobin.



State Crop	

Crop Group Represented	

Location	

Soil; Hydrologic Group (HYDG)	

Weather

(met file)

KS Sorghum	Sorghum	Osage County, KS	Dennis silt loam

HYDG: C	w13996.dvf

FL Cabbage	Cabbage and other vegetables	Manatee, FL	Riviera sand 

HYDG: C	w12844.dvf

 



Ground Water

Previously, the EPA determined that azoxystrobin exhibited properties
similar to some chemicals that have the potential to leach to ground
water, thus a ground water label advisory has been applied to the label.


SCI-GROW (SG23.exe, version 2.3, dated July 29, 2003) is a Tier I,
regression-based model that provides a groundwater screening exposure
value to be used in determining the potential risk to human health from
drinking water contaminated with the pesticide. Pesticide concentrations
estimated by SCI-GROW represent conservative or high-end exposure values
because the model is based on ground-water monitoring studies which were
conducted by applying pesticides at maximum allowed rates and frequency
to vulnerable sites (i.e., shallow aquifers, sandy, permeable soils, and
substantial rainfall and/or irrigation to maximize leaching). In most
cases, a large majority of the use areas will have ground water that is
less vulnerable to contamination than the areas used to derive the
SCI-GROW estimate. No PCA adjustment is required for SCI-GROW.  

μg/L (Table 7).

Table 7. SCI-GROW estimated ground water concentration for azoxystrobin
for maximum proposed rate (0.002 lb ai/acre).



Chemical	

Azoxystrobin



Concentration	 9.9e-04 μg/L



CITATIONS

Burns, L. A.  2004.  EXAMS (Exposure Analysis Modeling System) Version
2.98.04.  Environmental Research Laboratory.(04/25/05)  U. S.
Environmental Protection Agency. Athens, GA.

Carsel, R.F,  J.C. Imhoff,  P.R. Hummel,  J.M. Cheplick, A.S. Donigian,
Jr., L.A. Suarez.  2005.  PRZM-3.12.2 , PRZM (Pesticide Root Zone
Model).  A Model for Predicting Pesticide and Nitrogen Fate in the Crop
Root and Unsaturated Soil Zones:  Users Manual for Release 3.12.2  (May
16, 2005). National Exposure Research Laboratory, U.S. Environmental
Protection Agency,  Athens, GA.

EFED, 1999.  Standard Method of Determining the Leachability of
pesticides from treated seeds.  July 30, 1999,  USEPA, OPP, EFED,
Arlington, VA.

EFED, 2006.  EFED SHELL “Linkage Program “ PRZM-EXAMS Shell
PE5V01.pl PRZM-EXAMS Shell PE4V01.pl [dated Nov. 15, 2006].
Environmental Fate and Effects Division, Office of Pesticide Programs, 
U.S.  Environmental Protection Agency, Washington, D.C.

EFED. 2002.  Guidance for Selecting Input Parameters in Modeling the
Environmental Fate and Transport of Pesticides. Version II, February 28,
2002. USEPA, OPP, EFED, Arlington, VA.

Leovey, Elizabeth.  2002.  PRZM Standard Crop/Location Scenarios,
Procedure to Develop and Approve New Scenarios, and PRZM Turf Modeling
Scenarios to Date.   February 27, 2002.  USEPA. OPP. EFED, Arlington, VA

PMRA, 2000.  Pesticide Management Regulatory Agency. Health Canada. 
Regulatory Note. 	Azoxystrobin.  REG2000-15.
pmra_publications@hc-sc.gc.ca    Ottawa. Canada.

RUSLE, 2000.  RUSLE EPA Pesticide Project  File:  PestProjDocumtn.doc. 
rev. 1/5/00

SCI-GROW (Screening Concentration In Ground Water) 2003. .(version 2.3;
July 29, 2003). Environmental Fate and Effects Division, Office of
Pesticide Programs, U.S. Environmental Protection Agency, Arlington, VA

T-REX, 2005.   User’s Guide Version 1.2.3 (Terrestrial Residue
EXposure model) August 8, 2005.  Environmental Fate and Effects
Division, Office of Pesticide Programs,  U.S.  Environmental Protection
Agency, Washington, D.C.

USEPA. 2000. Drinking Water Screening Level Assessment. Part A:
Applying a Percent Crop 	Area Adjustment to Tier II Surface Water Model
Estimates for Pesticide Drinking Water Exposure Assessments. FQPA
Science Policy Document .Public Comment Draft September 1, 2000. 
Federal Register: October 11, 2000 (volume 65, number 197).  Electronic
copy available at http://www.epa.gov/pesticides/trac/science/ .

U.S. EPA. 2002a. Guidance for Selecting Input Parameters in Modeling the
Environmental Fate 	and Transport of Pesticides,  Version II (February
28, 2002).   Office of Pesticide Programs, Environmental Fate and
Effects Division, U.S. Environmental Protection Agency. Arlington, VA

U.S. EPA. 2002b. Pesticide Root Zone Model (PRZM) Field and Orchard Crop
Scenarios: 

Standard Procedures for Conducting Quality Control and Quality
Assurance. Office of Pesticide Programs, Environmental Fate and Effects
Division, U.S. Environmental Protection Agency. Arlington, VA

USEPA.  2003. Use of Regional Percent Crop Area Factors in Refined
Drinking Water 

Assessments, US EPA Office of Pesticide Programs (OPP), Environmental
Fate and Effects Division (EFED), Water Quality Technical Team (WQTT),
July 25, 2003, Arlington, VA

 

APPENDIX 1.   Previously assessed crops and application rates

Appendix 1. Table 1.  Previously assessed crops, DP Barcode and product,
maximum application rate, reapplication interval, and maximum season
application for azoxystrobin products.



	

	

Application



Crop and Action	

DP Barcode

(product assessed)	

Maximum Rate (lbs ai/acre)	

Interval (days)	

Maximum Seasonal  (lbs ai/acre)



Tobacco 

(Add tobacco to label)	

D301948

(Abound)	

0.20

4 applications at 0.13 per application	

7-14 days ( 1 to 4 applications)	

0.52



IR-4: Tolerance, Seed Production, Minor use

(Oil Seeds)	

D312950

(Amistar)	

max - 0.23

0.11 at early bud,

0.23 at 45 days before harvest,

0.11 at about 45 days before harvest	

15 days

(app 1 = 0.112

(app 2 = 0.225)

(app 3 = 0.112

	

0.45

(4x)

limit to 3 applications



IR-4 Tolerance, Herbs and Spices: Spices sub group 19B - except black
pepper products, Minor use	

D312952

(Amistar)	

 0.15 to 0.25

	

7 to 14 days (1 to 6 applications)	

1.50 lb ai/acre/crop



IR-4 Tolerance, Herbs and Spices: Herb subgroup 19A	

D312954

(Amistar)	

0.1 to 0.25

	

 7 days

(1 to 6 applications)	

1.5 lb ai/acre/crop  



New Use; Fruiting Vegetables: Crop Group 8 (except tomatoes)	

D317292

(Abound)	

0.10 to 0.25

0.31 soil borne	

7-14 days (1 to 4 applications)

1 application	

1.0



New Use; Legume Vegetables: Crop Group 7 forage, hay	

D317292

(Abound)	

0.10-0.25

 	

7-14 days (1 to 6 applications)	

1.5



Oil Seeds: crambe, flax, Mustard, rapeseed (canola) safflower,
sunflower,	

D317292

 (Abound)	

0.10-0.25

0.11 at early bud,

0.23 at 45 days before harvest,

0.11 at about 45 days before harvest

soil borne	

 	

0.45



New Use; Pea and Bean, Succulent Shelled: Sub-Group 6-B

Legume Vegetables; soil disease	

D317292

(Abound)

soil borne

	

0.10-0.25

0.31 soil borne	

7-14 days (1 to 6 applications)

1 application	

1.5



New Use; Pea and Bean, Dried Shelled (except soybeans): Sub-group 6C	

D317292

(Abound)

	

0.10-0.25

0.31 soil borne	

7-14 days (1 to 6 applications)

1 application	

1.5



New Use Forage, fodder, straw hay grass, and non-grass; Crop Group 18,
Nongrass Animal Feed	

D317292

(Abound)	

0.10 to 0.25	

7-14 days (number of application not stated)	

0.75 to 1.5



Herb; Sub group 19 A, fresh -adding chives	

D317292

(Abound)	

0.10 to 0.25	

7 days (1 to 6 applications)	

1.5



Herb; Sub group 19 A, dried -adding chives	

D317292

(Abound)	

0.10 to 0.25	

7 days (number of application not stated)	

1.5



Section 3: Roses (Greenhouse) 

Engineering control statements

NOT ASSESSED	

D313858

(A12910C fungicide)	

0.046

 (280SC formulation)

Azoxystrobin

Cyproconazole 	

1 application 

aerial application? p.3	

5.0 lb ai/ac/yr

[this appears to incorrect]



APPENDIX 2.  MODELING OUTPUTS.

stored as cabbagekoc.out

Chemical: azoxystrobin

PRZM environment: FLcabbageSTD.txt	modified Thuday, 24 May 2007 at
10:40:46

EXAMS environment: ir298.exv	modified Tueday, 26 August 2008 at 06:14:08

Metfile: w12842.dvf	modified Tueday, 26 August 2008 at 06:14:20

Water segment concentrations (ppb)

Year	Peak	96 hr	21 Day	60 Day	90 Day	Yearly

1961	0.003172	0.003082	0.001938	0.000781	0.0005206	0.0001284

1962	0.002682	0.002608	0.002325	0.001827	0.001549	0.0005601

1963	0.01193	0.0117	0.01041	0.007469	0.004981	0.001253

1964	0.00594	0.005786	0.005209	0.004159	0.00355	0.001444

1965	0.006499	0.006308	0.005581	0.004342	0.003492	0.001207

1966	0.002624	0.002557	0.002304	0.0019	0.001633	0.0008517

1967	0.01114	0.01081	0.009626	0.007481	0.006265	0.001698

1968	0.009139	0.00887	0.007851	0.006435	0.004995	0.002016

1969	0.003572	0.003486	0.003148	0.002527	0.002169	0.0009388

1970	0.0008664	0.0008449	0.0007598	0.0006065	0.000518	0.0002027

1971	0.02034	0.01973	0.01815	0.01458	0.01182	0.002971

1972	0.007008	0.006827	0.006128	0.004904	0.004197	0.001915

1973	0.002281	0.002214	0.001985	0.001688	0.001153	0.0006423

1974	0.002235	0.002174	0.001598	0.0008386	0.0007131	0.0003454

1975	0.003213	0.003117	0.002764	0.00219	0.001805	0.0008078

1976	0.001847	0.001793	0.001587	0.001452	0.001226	0.0005848

1977	0.001377	0.001337	0.001275	0.0007704	0.0005211	0.0003127

1978	0.003242	0.003145	0.002803	0.002205	0.001575	0.0005841

1979	0.001556	0.001526	0.001385	0.001109	0.0009475	0.000355

1980	0.002205	0.002141	0.001994	0.001316	0.0008815	0.0003162

1981	0.002509	0.002441	0.001141	0.000969	0.0008524	0.0003559

1982	0.002336	0.002271	0.00205	0.00163	0.001383	0.0005756

1983	0.0008387	0.0008197	0.0007369	0.0006786	0.0006078	0.000301

1984	0.0006537	0.0006367	0.0005716	0.0004552	0.000388	0.0001387

1985	0.01183	0.01161	0.01029	0.007995	0.005445	0.001371

1986	0.008166	0.007991	0.007367	0.006446	0.00543	0.002399

1987	0.0101	0.009809	0.008771	0.007952	0.006554	0.002312

1988	0.006466	0.006279	0.005599	0.003899	0.002787	0.001636

1989	0.00445	0.004318	0.003817	0.003093	0.002399	0.001385

1990	0.008509	0.008252	0.00736	0.005707	0.004606	0.001524

Sorted results

Prob.	Peak	96 hr	21 Day	60 Day	90 Day	Yearly

0.032258064516129	0.02034	0.01973	0.01815	0.01458	0.01182	0.002971

0.0645161290322581	0.01193	0.0117	0.01041	0.007995	0.006554	0.002399

0.0967741935483871	0.01183	0.01161	0.01029	0.007952	0.006265	0.002312

0.129032258064516	0.01114	0.01081	0.009626	0.007481	0.005445	0.002016

0.161290322580645	0.0101	0.009809	0.008771	0.007469	0.00543	0.001915

0.193548387096774	0.009139	0.00887	0.007851	0.006446	0.004995	0.001698

0.225806451612903	0.008509	0.008252	0.007367	0.006435	0.004981	0.001636

0.258064516129032	0.008166	0.007991	0.00736	0.005707	0.004606	0.001524

0.290322580645161	0.007008	0.006827	0.006128	0.004904	0.004197	0.001444

0.32258064516129	0.006499	0.006308	0.005599	0.004342	0.00355	0.001385

0.354838709677419	0.006466	0.006279	0.005581	0.004159	0.003492	0.001371

0.387096774193548	0.00594	0.005786	0.005209	0.003899	0.002787	0.001253

0.419354838709677	0.00445	0.004318	0.003817	0.003093	0.002399	0.001207

0.451612903225806	0.003572	0.003486	0.003148	0.002527	0.002169	0.0009388

0.483870967741936	0.003242	0.003145	0.002803	0.002205	0.001805	0.0008517

0.516129032258065	0.003213	0.003117	0.002764	0.00219	0.001633	0.0008078

0.548387096774194	0.003172	0.003082	0.002325	0.0019	0.001575	0.0006423

0.580645161290323	0.002682	0.002608	0.002304	0.001827	0.001549	0.0005848

0.612903225806452	0.002624	0.002557	0.00205	0.001688	0.001383	0.0005841

0.645161290322581	0.002509	0.002441	0.001994	0.00163	0.001226	0.0005756

0.67741935483871	0.002336	0.002271	0.001985	0.001452	0.001153	0.0005601

0.709677419354839	0.002281	0.002214	0.001938	0.001316	0.0009475
0.0003559

0.741935483870968	0.002235	0.002174	0.001598	0.001109	0.0008815	0.000355

0.774193548387097	0.002205	0.002141	0.001587	0.000969	0.0008524
0.0003454

0.806451612903226	0.001847	0.001793	0.001385	0.0008386	0.0007131
0.0003162

0.838709677419355	0.001556	0.001526	0.001275	0.000781	0.0006078
0.0003127

0.870967741935484	0.001377	0.001337	0.001141	0.0007704	0.0005211
0.000301

0.903225806451613	0.0008664	0.0008449	0.0007598	0.0006786	0.0005206
0.0002027

0.935483870967742	0.0008387	0.0008197	0.0007369	0.0006065	0.000518
0.0001387

0.967741935483871	0.0006537	0.0006367	0.0005716	0.0004552	0.000388
0.0001284

0.1	0.011761	0.01153	0.0102236	0.0079049	0.006183	0.0022824

					Average of yearly averages:	0.00103774

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: cabbagekoc

Metfile:	w12842.dvf

PRZM scenario:	FLcabbageSTD.txt

EXAMS environment file:	ir298.exv

Chemical Name:	azoxystrobin

Description	Variable Name	Value	Units	Comments

Molecular weight	mwt	403.3	g/mol

Henry's Law Const.	henry		atm-m^3/mol

Vapor Pressure	vapr	8.2e-13	torr

Solubility	sol	6.7	mg/L

Kd	Kd		mg/L

Koc	Koc	210	mg/L

Photolysis half-life	kdp	23.23	days	Half-life

Aerobic Aquatic Metabolism	kbacw	322.2	days	Halfife

Anaerobic Aquatic Metabolism	kbacs	62.3	days	Halfife

Aerobic Soil Metabolism	asm	161.2	days	Halfife

Hydrolysis:	pH 7	0	days	Half-life

Method:	CAM	5	integer	See PRZM manual

Incorporation Depth:	DEPI	2	cm

Application Rate:	TAPP	0.0005	kg/ha

Application Efficiency:	APPEFF	1	fraction

Spray Drift	DRFT	0	fraction of application rate applied to pond

Application Date	Date	05-10	dd/mm or dd/mmm or dd-mm or dd-mmm

Record 17:	FILTRA	

	IPSCND	

	UPTKF	

Record 18:	PLVKRT	

	PLDKRT	

	FEXTRC	0.5

Flag for Index Res. Run	IR	Reservoir

Flag for runoff calc.	RUNOFF	total	none, monthly or total(average of
entire run)

stored as sorghumkoc.out

Chemical: azoxystrobin

PRZM environment: KSsorghumSTD.txt	modified Tueday, 29 May 2007 at
13:55:46

EXAMS environment: ir298.exv	modified Tueday, 26 August 2008 at 06:14:08

Metfile: w13996.dvf	modified Tueday, 26 August 2008 at 06:14:52

Water segment concentrations (ppb)

Year	Peak	96 hr	21 Day	60 Day	90 Day	Yearly

1961	0.009048	0.00888	0.008236	0.007308	0.006703	0.002823

1962	0.0154	0.01508	0.01416	0.01219	0.01079	0.004576

1963	0.004922	0.004832	0.004578	0.004076	0.003748	0.00217

1964	0.005366	0.00526	0.004942	0.004222	0.003753	0.001726

1965	0.005791	0.005687	0.005429	0.004784	0.004275	0.001946

1966	0.008377	0.008267	0.007693	0.006486	0.005755	0.002504

1967	0.01043	0.01024	0.01001	0.008797	0.008291	0.003913

1968	0.003816	0.003742	0.003533	0.003152	0.002928	0.001789

1969	0.01073	0.01052	0.01014	0.009146	0.008699	0.003899

1970	0.009063	0.008948	0.008574	0.007839	0.007031	0.003318

1971	0.01543	0.01515	0.01475	0.01296	0.01153	0.00494

1972	0.009665	0.009484	0.008864	0.007879	0.007294	0.003633

1973	0.01317	0.01293	0.01218	0.01092	0.01017	0.004671

1974	0.007633	0.007491	0.006938	0.006549	0.005979	0.003039

1975	0.004415	0.004359	0.004064	0.003616	0.00327	0.00167

1976	0.005554	0.005451	0.005035	0.00438	0.003964	0.001828

1977	0.03873	0.03824	0.03579	0.03189	0.02886	0.01189

1978	0.01204	0.01182	0.01106	0.00982	0.008743	0.005075

1979	0.003899	0.003824	0.003607	0.003167	0.002908	0.001767

1980	0.009407	0.009218	0.008454	0.007155	0.006434	0.002796

1981	0.01707	0.01675	0.01552	0.01336	0.01185	0.005195

1982	0.01984	0.01954	0.01828	0.01574	0.01405	0.006275

1983	0.007574	0.00746	0.007077	0.006278	0.005601	0.00291

1984	0.01142	0.0112	0.01041	0.009773	0.0088	0.003761

1985	0.006849	0.006716	0.006263	0.005455	0.005058	0.002648

1986	0.01605	0.01583	0.01517	0.01302	0.01159	0.004927

1987	0.007343	0.007198	0.006826	0.006328	0.005684	0.002945

1988	0.006575	0.006443	0.006012	0.005055	0.004745	0.002435

1989	0.01684	0.01653	0.01564	0.01396	0.01265	0.005495

1990	0.01459	0.01432	0.01325	0.01144	0.01018	0.004747

Sorted results

Prob.	Peak	96 hr	21 Day	60 Day	90 Day	Yearly

0.032258064516129	0.03873	0.03824	0.03579	0.03189	0.02886	0.01189

0.0645161290322581	0.01984	0.01954	0.01828	0.01574	0.01405	0.006275

0.0967741935483871	0.01707	0.01675	0.01564	0.01396	0.01265	0.005495

0.129032258064516	0.01684	0.01653	0.01552	0.01336	0.01185	0.005195

0.161290322580645	0.01605	0.01583	0.01517	0.01302	0.01159	0.005075

0.193548387096774	0.01543	0.01515	0.01475	0.01296	0.01153	0.00494

0.225806451612903	0.0154	0.01508	0.01416	0.01219	0.01079	0.004927

0.258064516129032	0.01459	0.01432	0.01325	0.01144	0.01018	0.004747

0.290322580645161	0.01317	0.01293	0.01218	0.01092	0.01017	0.004671

0.32258064516129	0.01204	0.01182	0.01106	0.00982	0.0088	0.004576

0.354838709677419	0.01142	0.0112	0.01041	0.009773	0.008743	0.003913

0.387096774193548	0.01073	0.01052	0.01014	0.009146	0.008699	0.003899

0.419354838709677	0.01043	0.01024	0.01001	0.008797	0.008291	0.003761

0.451612903225806	0.009665	0.009484	0.008864	0.007879	0.007294	0.003633

0.483870967741936	0.009407	0.009218	0.008574	0.007839	0.007031	0.003318

0.516129032258065	0.009063	0.008948	0.008454	0.007308	0.006703	0.003039

0.548387096774194	0.009048	0.00888	0.008236	0.007155	0.006434	0.002945

0.580645161290323	0.008377	0.008267	0.007693	0.006549	0.005979	0.00291

0.612903225806452	0.007633	0.007491	0.007077	0.006486	0.005755	0.002823

0.645161290322581	0.007574	0.00746	0.006938	0.006328	0.005684	0.002796

0.67741935483871	0.007343	0.007198	0.006826	0.006278	0.005601	0.002648

0.709677419354839	0.006849	0.006716	0.006263	0.005455	0.005058	0.002504

0.741935483870968	0.006575	0.006443	0.006012	0.005055	0.004745	0.002435

0.774193548387097	0.005791	0.005687	0.005429	0.004784	0.004275	0.00217

0.806451612903226	0.005554	0.005451	0.005035	0.00438	0.003964	0.001946

0.838709677419355	0.005366	0.00526	0.004942	0.004222	0.003753	0.001828

0.870967741935484	0.004922	0.004832	0.004578	0.004076	0.003748	0.001789

0.903225806451613	0.004415	0.004359	0.004064	0.003616	0.00327	0.001767

0.935483870967742	0.003899	0.003824	0.003607	0.003167	0.002928	0.001726

0.967741935483871	0.003816	0.003742	0.003533	0.003152	0.002908	0.00167

0.1	0.017047	0.016728	0.015628	0.0139	0.01257	0.005465

					Average of yearly averages:	0.00371036666666667

Inputs generated by pe5.pl - Novemeber 2006

Data used for this run:

Output File: sorghumkoc

Metfile:	w13996.dvf

PRZM scenario:	KSsorghumSTD.txt

EXAMS environment file:	ir298.exv

Chemical Name:	azoxystrobin

Description	Variable Name	Value	Units	Comments

Molecular weight	mwt	403.3	g/mol

Henry's Law Const.	henry		atm-m^3/mol

Vapor Pressure	vapr	8.2e-13	torr

Solubility	sol	6.7	mg/L

Kd	Kd		mg/L

Koc	Koc	210	mg/L

Photolysis half-life	kdp	23.23	days	Half-life

Aerobic Aquatic Metabolism	kbacw	322.2	days	Halfife

Anaerobic Aquatic Metabolism	kbacs	62.3	days	Halfife

Aerobic Soil Metabolism	asm	161.2	days	Halfife

Hydrolysis:	pH 7	0	days	Half-life

Method:	CAM	5	integer	See PRZM manual

Incorporation Depth:	DEPI	3	cm

Application Rate:	TAPP	0.002	kg/ha

Application Efficiency:	APPEFF	1	fraction

Spray Drift	DRFT	0	fraction of application rate applied to pond

Application Date	Date	05-05	dd/mm or dd/mmm or dd-mm or dd-mmm

Record 17:	FILTRA	

	IPSCND	

	UPTKF	

Record 18:	PLVKRT	

	PLDKRT	

	FEXTRC	0.5

Flag for Index Res. Run	IR	Reservoir

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Flag for runoff calc.	RUNOFF	total	none, monthly or total(average of
entire run)

                           SCIGROW

                          VERSION 2.3

            ENVIRONMENTAL FATE AND EFFECTS DIVISION

                 OFFICE OF PESTICIDE PROGRAMS

             U.S. ENVIRONMENTAL PROTECTION AGENCY

                        SCREENING MODEL

                FOR AQUATIC PESTICIDE EXPOSURE

 

 SciGrow version 2.3

 chemical:azoxystrobiin

 time is  6/ 3/2009  14:36:19

 -----------------------------------------------------------------------
-

  Application      Number of       Total Use    Koc      Soil Aerobic

  rate (lb/acre)  applications   (lb/acre/yr)  (ml/g)   metabolism
(days)

 -----------------------------------------------------------------------
-

      0.002           1.0           0.002      2.10E+02       85.0

 -----------------------------------------------------------------------
-

 groundwater screening cond (ppb) =   9.91E-04 

 ***********************************************************************
*

 

 PAGE  2 

 PAGE   

 PAGE   17 

OFFICE OF

PREVENTION, PESTICIDES AND

TOXIC SUBSTANCES

