UNITED STATES ENVIRONMENTAL PROTECTION AGENCY WASHINGTON , D
.C
. 20460



## DfC 2·2

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MEMORANDUM 

### SUBJECT: FROM:

THRU: 

### BEAD Chemical Profile for RegistrationReview: Sulfosulfuton Jihad· Alsadek, Ph.D. Economist

# y~A-**~ J.t..~** **.** Science Information and Analysis Branch Stephen Smearman, Economist

### ~ L.. 

# r _ 1
. . Ec;;onomic Analysis Branch 

# pup**~~** Bill Phillips, II, Ph.D. Agronomist

# ~ Biological Analysis Branch Biological and Economic Analysis Di
. ion (7503P) Arnet Jones, Chief () 

## J. II 

### Biological Analysis Branch**~~** 

### Diann Sims, Chief 

# hr

# ~ 

# k 0 Science Information and Analysi \ sB ranch

# ~ Timothy Kiely, Chief

# ~**~** Economic Analysis Branch 

# ,,_ !'0
_ \.AI\.. Biological and Economic Analysis Division (7 ) TO: Carissa Cyran, Chemical Review Manager Pesticide Re-evaluation Division (7508P)
Peer Review Panel Date: November 24, 2010 OFFICE; OF CHEMICAL SAFETY AND POLLUTION PREVENTION



### Attached is the Biological and.Economic Analysis Division (BEAD) Chemical Profile for Registration Review for the chemical Sulfosulfuron. The purpose ofthis document is to convey usage information and a broad overview ofthe pest management roles ofpesticides that are beginning registration review. The intended audiences for this document are the OPP registration review team and the general public. This document builds upon the data that has been provided inthe "Use·and Label Use Data Packages" that are also provided to Registration Review teams by BEAD.


### 1

### INTRODUCTION The purpose ofthis document is to convey usage information and 

## abroad overview ofthe · pest managementroles ofpesticides that are beginning registration review. The intended audience for this document is the opp registration review team and the general public. This document builds upon the data already provided in the "Usage and Label Use Data Packages" that are also provided to Registration Reviewteams by the Biological and Economic Analysis Division (BEAD). 

### In agronomic production, sulfosulfuron is an herbicide that is usedpre and post emergence in winter and spring wheat as well
. as post emergence in alfalfa and pastures. 

### In addition to these uses, this herbicide is applied post emergence 

### invariouS non-agricultural/industrial sites. Weed species controlled are grass and broadleafweeds. Sulfosulfuron is a sUlfonylureaherbicide with
. the mode ofaction ofinhibiting acetolactate/acetohydroxyacid synthase. The Herbicide Resistance Action Committee and Weed Science Society ofAmerica classify this herbicide in group B/21. Currently, there are reported weed biotypes resistant to this herbicide inthe U.S.


### USE SITES Agricultural Use Sites

The agricultural use sites for this herbicide forhay and pasture land are, agricultural fallow land, reserve bermudagrass, forage, fodder, hay, rangeland, and wheat. Non-Agricultural Use Sites

The non-agricultural use sites for this herbicide include airports and landing
.

. fields, private roads and walkways, exterior commercial/intuitional/industrial premises, commercial storage/warehouse premises, drainage systems,**~xterior** household/domestic dwellings,**no~gricultural** and utility pole rights-of-ways/fencerowslhedgerows, and nonagricultural uncultivated areas/soils. 

### In addition, ornamental trees, shrubs, and vines, herbaceous and nonflowering plants, commercial/industrial lawns, ornamental 

### turf, golfcourse 

### turf, residential/recreational lawns, sod farm, gJ;ound covers. 

### COMMON FORMULATIONS AND APPLICATION
.METHODS Sulfosulfuron is formulated as water dispersible granules and emulsifiable conce. ntrate only. Sulfosulfuron may be applied via broadcast (aerial or ground) spray, directed spz:ay, ground

1 Herbicide Resistant Action Committee http://www.weedscience.org/summary/ChemFamilySum
.asp?lstActive=478&btnSub 1 =Go&lstHRAC=


### 2spray, or injectiontreatment. Applications may be made using various types of sprayers (backpack, hand held, pump-up, and high- volume ground), aircraft, and soil injection equipment. USAGE Agricultural Based on private marketpesticide usage data, the annual total agricultural usage averaged 27,000 pounds active ingredient (A.O for approximately 1 million acres from 1998-2008 (G£K. Kynetec, 1998-2008). The use of sulfosulfuron, inpounds A.I., is mainly onwinter**~heat** (99%) Data indicate that there is some use nationally onpasture and**gr~slands** butthe use interms of pounds A.1. as a percentofthe total pounds applied is less than 1 percent annually. From 1998-200.8, the largest markets in terms oftotal pounds of**activ~** ingredient appliedto all crops and use sites are: winter wheat (99%), and spring wheat**(~1**%). Usage interms ofthe acres treated for 

### all crops and use sites is the same; winter wheat (99%), and spring wheat**(~1**%). (G£K. Kynetec, 1998-2008). The states with $e most agricultural usage in terms ofPounds AI applied are: Oklahoma (43%), Washington (23%), and Kansas (10%). (G£K. Kynetec, 1998-2008). Non-Agricultural The non-agricultural data shQwed less than 500 pounds active ingredient ofsulfosulfuron are used on golfcourses, nationally, in2006 (Kline Studies, Inc.). There are no currently available usage data for**residential"comm~rciallawns,** or sod farms. Usage for these sites may be occurring belowthe reporting threshold. USE TRENDS Historical usage data from 1998-2008 are detailed for winter wheat (Figure 1). The graph shows an average of40,000 pounds active ingredients for the period 2000-2004, and an average of 15,000 pounds active ingredient for the time'period 2005-2008. This is in contrastto the annual total agricultural usage that averaged 27,000 pounds active ingredient (A.I.) for the time period 1998-2008. The data do not show a clear trend, with a significant increase inthe number of pounds applied to wheat from 1999 to 2000, then fluctuating for the period 2000-2004, followed by a significant decrease inpounds applied in 2005. Forthe period 2005-2008, the number of pounds applied appears to showmodest increases year to year. BEAD is trying to determine why there was a significant increase in use starting in 2000 followed by a sudden drop in use in 2005. The data used were for preliminary scoping purposes only.



### 3

### ci. 

## -3 c ::I o Q. 

### WinterWheat

1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 Years 

### Figure 1. Pounds ofSulfosulfuron Applied to Winter Wheat (1998-2008) 

### BIOLOGICAL ASPECTS RELEVANT TO SULFOSULFURON Currently, there**~e** 

### many weed species and biotypes reported as resistant to this family of herbicides inthe U.S. There are a few weeds that are specifically resistant to this herbicide. As an example, weeds resistant to sulfosulfuron in Kansas, where wheat is a major crop, are broadleafweeds such 

## as bushy wallflower and flaxseed (e.g. Erysium repandum 

### and Descurainia sophia, 

### respectively) and grasses such as Japanese brome and rye brome (bromusjaponicus 

### and scalimus, 

### respectively). 

### mSTORY OF BEAD ASSESSMENTS FORSULFOSULFURON The following documents and
.assessments were found: 

### Use Related Documents Two use related references without documents found:

- There was· reference to 

### a public interest document in support ofa request for Section 3 registration for MON 37500 (sulfosulfuron}technical grade active ingredient and for Maverick herbicide end use product. 

### Section 18 Emergency Requests There were 28. Section 18 requests for sulfosulfuron. The requests were for grass control in grass crops and/orpastures. Overall there were 20 requests for the use ofthis herbicide to control johnsongrass inpasture and hay crops. 

### In additionto these requests, there·were sevenrequests 4

### for the use ofsulfosulfuron to control grasses in-wheat·and one request for grass control in rice for the years 1997 through 2007 (see Appendix A).
DATA NEEDS RELEVANT TO BEAD'S FUTUREWORK ON SULFOSULFURON Obtaining additional jnfonnation onthe following items would improve future BEAD assessments ofthe importance ofsulfosulfuron and may be required 

### as part ofthe registration review ofthis pesticide. 

### Usage Information·Requested for Sulfosufuron: Usage data for use on: agricultural sites including pasture/rangeland/agricultural
.fallow

- non-agricultural sites including rights-ofway, conservation areas, ditch backs, fencerows etc. forestry/nursery conifer release programs. Usage data should include the average application rate, use sites, pests and number ofacres treated for each agricultural use site. OPP is also requesting infonnation regarding the drop in use ofsulfosulfuron on winter wheat following the 2004 season. REFERENCES Appendix A Section 18 Data Base link: http://cfpub1
.epa.gov/oppref/section18/search
.cfm 

### GfK Kyrletec, 1998-2008. Proprietary Data. Kline Studies, Inc. 2006. Proprietary D
. ata.



### 5

### Appendix A Chemical Site Pest Applicant Received Response Status Tolerance Tolerance Date Date Publication Expiration SULFOSULFURON BERMUDA, JOHNSONGRASS GEORGIA 12715106 2/17/07 ISSUED BAHIA,GRASS, PASTURE HAYFIELD SULFOSULFURON BERMUDA AND BAHIA JOHNSONGRASS ARKANSAS 5/15107 5/29/07 ISSUED PASTURES, GRASS SULFOSULFURON BERMUDA, JOHNSONGRASS MISSISSIPPI
. 1/17/07 2/17/07 ISSUED BAHIA;GRASS PASTURE HAYFIELD SULFOSULFURON BERMUDA, GRASS, JOHNSONGRASS ALABAMA 12/15106 2117/07 ISSUED PASTURE HAYFIELD SULFOSULFURON BERMUDAGRASS JOHNSONGRASS OKLAHOMA 6/7/06 9/18/06 WITIIDRA WN 

## - SULFOSULFURON BERMUDAGRASS JOHNSONGRASS OKLAHOMA 2/22/07 5/11/07 ISSUED SULFOSULFURON BERMUDAGRASS JOHNSONGRASS -South Carolina 3/20/07 4/2107 WITIIDRA WN SULFOSULFURON BERMUDAGRASS JOHNSONGRASS TEXAS 5/17/07 6/14/07 ISSUED SULFOSULFURON GRASS, PASTURE JOHNSONGRASS ALABAMA 3/3/05 9/23/05 ISSUED 1lI16/05 12/31/09 SULFOSULFURON GRASS, PASTURE JOHNSON GRASS ARKANSAS 5/11106 5119/06 WITIIDRA 11/16/05 12131109 WN SULFOSULFURON GRASS, PASTURE JOHNSONGRASS GEORGIA 2114/05 9/23/05 ISSUED 11116/05 12/31/09 SULFOSULFURON GRASS, PASTURE JOHNSONGRASS GEORGIA 6/22/04 2/14/05 WI11HI>RA 11/16/05 12/31/09 WN


### 6SULFOSULFURON GRASS, PASTURE JOHNSONGRASS LOUISIANA 6/23/04 9123/05 ISSUED 11116/05 12131109 SULFOSULFURON GRASS, PASTURE JOHNSONGRASS MISSISSIPPI 7/14/04 21f!05 VVI11HI>RA 11/16/05 12131109 WN SULFOSULFURON GRASS, PASTURE JOHNSONGRASS MISSISSIPPI 211105 9/23/05 ISSUED 11/16/05 12131109 SULFOSULFURON GRASS, PASTURE JOHNSONGRASS OKLAHOMA 6/15/04 10/18/04 VVI11HI>RA 11/16/05 12/31109 WN SULFOSULFURON GRASS, PASTURE JOHNSON GRASS TEXAS 3/21106 7/26/06 ISSUED ll/16/05 12/31109 SULFOSULFURON GRASS, PASTURE, JOHNSONGRASS LOUISIANA 6/12/07 6/25/07 VVI11HI>RA BERMUDA, BAHIA WN SULFOSULFURON GRASS, PASTURE, JOHNSONGRASS LOUISIANA 7/25/07 7/30/07 ISSUED BERMUDA, BAHIA SULFOSULFURON PASTURES, GRASS, JOHNSONGRASS ARKANSAS 5/15/07 5/29/07 ISSUED BERMUDA AND BAHIA SULFOSULFURON RICE BARNYARD GRASS ARKANSAS 2/10/00 317/00 ISSUED SULFOSULFURON WHEAT DOWNYBROME IDAHO 7/29/97 12/3/97 DENIED SULFOSULFURON WHEAT DOWNYBROME IDAHO 5/6/98 10/1/98 ISSUED SULFOSULFURON WHEAT CHEAT OKLAHOMA 8/10/98 10/1198 ISSUED SULFOSULFURON WHEAT DOWNYBROME OREGON 7/29/97 12/3/97 DENIED SULFOSULFURON WHEAT DOWNYBROME OREGON 4/27/98 10/1198 ISSUED SULFOSULFURON WHEAT DOWNYBROME WASHINGTON 7/29/97 '12/3/97 DENIED SULFOSULFURON WHEAT DOWNYBROME WASHINGTON 5/6/98 10/1/98 ISSUED



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