UN ITED STATES EN VIRC'NME NTAL PRO TECTION AGE NCY W AS HI N3 T O N , D. C
. 2 0 46 0 

### M

A

il 3 0 2011

O FFI CE OF CHE MICAL SA FETY AN D POLLUTIO N PREVE NTION ME M ORAN DUM
S UBJE CT : BEA D C hem ica l P rofile fo r Re gistr ati o n R e view : T ribenuron-methy l (P C C o d e : 1 28887) F ROM : Jih ad A l sa dek , Eco n o mi s t

### ~~ S c ie n ce Inf orm ation an d A n ::t y;i s n;;- nch

B ill Philli p s , II , Ph .D., A g rono mist B io logica l A n a l ys is Br anch B io lo gical and E co nom ic A n al iv is ion ( 7 503P) D iann S ims , C hie f

# M'"::~ Sci e nce In f orm ation an d A n a ly sis Br anch Ti mothy Kie ly, C hie f 

# -.g z.e,l \ Eco n o mic A n a lysis Br anch I 

## .p,.. 

## --rBi ologica l a nd Eco nomic A na l ys i s Div i s ion (7 S03 P) A me t J o ne s, C h ief Bi ologica l A nal ys i s Br anc h-' 

# U
M o ni c a Wa it , C hemical R e vi ew M anager Pe st icid e Re-evaluation D iv i sion (75 08P) J ohn Fa ulkner , Eco nomi s t Eco nom ic A na lys i s B ranch

TO : T HRU

P e er Review P anel D ate : S e ptember 2 2 , 2010 INT RO D UCTION T h e purpo se o f thi s d o c ument i s to c on v e y us age information a nd a b road ov erv iew of th e p e s t m anagement ro les o f p e sticides that are b eg in ning t o un derg o re gis tration re v iew. Th e an ticipated a udience co n sis t s of th e team of EP A s ta ff c ur rently e va l uating th e re gi str ation s ta tus o f tr ibenuron

- meth y l , an d even tually the ge n er a l p ub li c. Thi s d ocument b ui ld s up on th e d ataalready provided in the " Us age and Label Use Data Package s" t hat are a l s o p rovided to Reg i s trati o n R evie w teams b y B EAD
. Tr ibenuron

- mcthy l is an herbicide u sed in s m a ll grai n c rop s, co rn , co tton , r ice , s or g hum, s oybeans, and s o me horticultural c rops t o co ntrol ann ual bro ad le afw eeds a nd th e s uppr essio n o f so me perennial w eed s pe c ies
. A dditional u s e s in c lud e wee d c ontrol in tobacc o and p a sture s ites. Weed s c ontro lle d incl ude man y s pe c ies and bi otype s that are re sistan t to s eve ral cl asses of herbicide s. T r i benuron-m eth yl i s a s u l fo nylurea wi th t he mod e o f action o f inhib iting th e e nz yme aceto lactat e s ynthas e, and i s cla s sified b y th e He rbicide Resis tance Ac tion Co mmittee and W eed S c i e nce S ocie ty o f A merica in group B I2 I

. C urre ntly , th ere are se vera l w e ed s pe c ies and bi otype s repo rted a s r e s i s tant to th i s famil y o f her oicide s i n the U .S
. 

### U

SE S ITES A gricultural U s e S ite s

Us e s ites for trib enurcn-m eth yl are, A lfa lfa , C orn - pop , Potato
- whit e /iri sh , B arle y , C o rn - s wee t, Pump kin , B ea n s - dri ed -type , C otton ( un sp ecified), Ric e , B eans - s u c culent ( s nap) , C uc umbe r, S o r g h um, Blu eberry , Fa llo wland / c on s. Re serve, So rghum ( un s pecified) , C abba ge, Fl ax , S oyb ea n s ( un s pecified) , C ano lau apc, L e nti ls , S ug ar b e et , C arro t ( including top s ), M elon s - wat er, S unflower , Cereal grain s, M ust ard, S weet po tato , C l ove r, O at s, T o b acco, C o rn ( s ilage) , O nion, Tomato , C o rn (un s pecifi ed ) , Pastur e, Triti cal e, Co m - fi e ld , P eanut s ( unsp e c i fied), Wheat, Pea s (un sp ecified ), Yam
N o n - A gri c ultur a l Use S ites N on e 

### C OMMON FORMULA TIONS AND AP PLICATIO N ME T H ODS Trib enuron -methyl i s f ormu lat ed a s wa ter di sper s ible g ranu l e s ( dry flowab l e) o n ly . T ribe n uro n meth y l i s applied a s a S p o t treatment , broadca st o r bu-n down tre atment v ia gro und or w ith air craft. It c an a lso b e app li ed a s a B and treatment w ith a band s p ray er and ground; an d a s a low v o lume s pray v i a gro und o r aircraft. Tr ibenuron

- methy l u sa ge d at a on po st
- harve st and n on-agocro p s/ si te s a re not a va ila ble f rom our c urrent d ata so urce s. 

### US AGE A gric ultural Us ag e

1 Her bicide R esista nt Ac tio n C o mmitt ee http :/ /w ww . w eedscience
. org/summ ary/C he m j-

am i lySum .asp ? I st A ct i ve- 14 6 &bln S ub I = 0 0 & I stH RA C = 2Ba sed o n pr ivate m arket pesticide u s age da t a , the annua l tota l agricultural u sage a veraged appro ximately 5 4,000 p ounds acti ve in gred ient (A J .) f or alm ost 9 milli on ac re s f rom 1998- 2008 ( GfK Kynetec, 19 98-2008). T he u se o ftri henuron-m ethyl, in p ounds A I., and ac re s treated are rel atively s tab le o ver th e peri od s pan . From 1998-2008 , th e large st mark ets in tenu s o f total pound s o f acti ve in gredient a pp l ied are : w inter w heat (46 %) , s p rin g w heat (3 4%) , b arle y (11 %), and soy beans ( 6 %). T he hig h e st acreage c rops treated : wint er w heat ( 45%), s pring whe at ( 38%) , barl ey ( 10%) , and soy bean s (5%) (G fK K

yn etec , 1 998

- 2008)
. T he s tate s with the mo st ag ricultural u sag e i n te nu s of P ound s A I applied are : N orth Ca ro l ina (2 7%) , Mo ntana ( 8%), I dah o/ W a s hin gto nl lllinoi s/ K e ntuck y ( 6 % e ach). T he s t ates w ith th e mo s t total area tre ated ( TAT ) a re : N o rth Caro lina ( 28 % ) , M o ntana (9 %), W a shin gton ( 8%) , and Idaho / South Dakot a ( 6% e ach) ( G fK Kynete c, 1 9 98-2 0 0 8 ). N on-Agricultural U sage Trib enu ron-meth yl u s age d ata on non- agric ultural usag e ar e not ava ilable from our current data s o ur ces.
U SE TRE NDS T he fo ll owing graph s pro vide u sa ge trend s , in term s o f pound s applied , fo r tribenuron methyl' s lar ge st ag ricultura l m arkets. Th e data provi ded in thi s sec tion are prov ided for preliminary sco ping purpo ses o nly b ecau s e th e d ata ha ve n ot b een anal y zed
. U s e o f tri benuron -methyl o n w int er whea t i s rel atively s table ove r the time s pan 1 998-2008 , e xcept for the yea r 2 003 when u s age w as the hi ghe s t. Us ag e on s prin g w heat and barle y w ere o n th e d ecline durin g th e s ame t ime per iod
. U sage o n s oy be ans s tarted to r i se i n 20 01 a nd re ached a m aximum in 20 08
. W inter W h. , .t 35 ,000 

# I ;;: 

## • -e 

# I c 

# , 0 

# .. 0 1 998 t 999 2000 2001 20 02 2003 2004 2005 2006 2007 2008 Y u ar

3Spring Wheal 3 5 ,000 

### :;;: 

# • -e C 

# , 0 c, 0 1 998 1 999 2000 2 00 1 2002 2003 2004 :W05 2 006 2007 2008 Year Barley 12 ,000 

### :;;: 

# • ." C 

# , 0 c, 

# l JU ]j ]J 0 1 998 1 999 2000 200 1 2002 2003 2004 ; W05 2006 2007 200 8 Y

ear Soybeans 25,000 

### :;;: 

# • -e C 

# , 0 a, 0 

## n n 

# n 1998 1999 2 000 200 1 2002 2003 2004 2005 2006 2007 2008 Year

4BIOLOGICAL ASPECTS RE LEVANT T O TRIBEN URON -METHYL C urrently , th ere are sev eral w eed s pec ies a n d bi o types reported as re s i s tant t o thi s f amily o f h erbicides i n th e U.S.
IIIS TORY O F BEAD ASSESSMENTS F OR TRIBENURON -MET HYL In a n a lternative a naly s i s ( Z inn a nd Kim , 20 05), trib enur on m ethyl wa s i dentified a s a l ikely alte rnative to chl or sulfuron
. In an a ssess ment o f p otential miti gation m easure s f or atrazine (Jo nes a nd Wi daw s ky, 20 03) th e o nly reco mmended a lternative i s thi fensulfuron-methyl plu s trib enuron-methyl f or w inter wee d c ontrol o n s or g hum. No o ther assessme nts o r Sec tion 1 8 reviews we re fo und i n th e B EAD d atabase , DATA NEEDS RE LEVANT TO B EAD'S F U TURE WORK ON T RIBENURONMETHYL D ata rega rding th e decli ne i n u s e in s p r i ng wheat. D ata reg arding th e r apid a doption of this he rb icide in s oyb e an. REFERENCES G tK K ynetec , 1 998

- 2008. Pr oprietary Da ta. Jon es, A rnet W. a nd W idaw sky, D avid. 200 3. A ssess ment o f P otent ial Mi tigation Meas ure s f or A trazine , 1 3 Feb 2 003. K line & Co mpany , Pro fes s ional T urf a nd Orn amental M arke ts fo r Pe sticides a nd F ertili zers (2 000, 2 002, 2 005 , a nd 2 007) K line & Co mpany, Co n su mer s M arket s fo r P es ti c ides a nd Fe rtilizers (2 00 1 , 2 004 , a nd 2 006) FIF RA Sec tion 18 Eme rgency Ex emption s Data base , http ://cfp ub1.epa ·90v/opp ref/section18/sea rch .c'm Zi nn, N icole a nd Kim , Ji n . 2 005
. A ddendum t o C hlorsu lf uron B enefits D iscussio n for A eria l A pplications : A lternative s A nalysi s f or W inter W heat; D3 1 3380 , 5 M ay 2 005
.



### 5