U N IT ED STATES ENVIRONMENTAL PROTECTION A GEN CY WAS H INGTON . D.C. 20460 

### JAN 20 20 11

OFFICE OF CHE MICA L SAFETY AND POLL UTION PREVENTION 

### MEMORAND UM SUBJECT: B EAD C hemical Profil e for R egistration R eview : DCPA (0 7870 I ) FROM:

THRU : Sunil Ratnayake , Bo tanist

### /\ () B iological An alysi s Bran ch \. t 

# ¥\..\ Kath erine Ste bbins , B iologist .**'(1.:f:f -l**  

### i u.- 5Iztt; ,,,j) Sc ience Information and A nalysis Bran ch M ichelle R anville , Eco nomist 

# Li1**~)** E conomic A nalysis B ranch

- Bi ological and E c o no mic A naly s is Di vision (75 03P) A rnet Jon es , C hief B iological An aly s is Bran c Diann S ims, C hief 

### S cience Information and Analy s i s Branch T imothy Kiely , Chi ef . 

# \AA ) E conomic A nalysis Branch ( 

### Biol ogical and Economic A nSJ:is ion (75 03P) T O : Jill B loom , C hemical R eview Manag er Risk Management and Impl ementation Division Bran ch 2 P esticide Re- E valuation D ivision ( 7508P)



### P e er R eview Panel da te: Decemb er 1 , 2010 

### I NTRODUCTI ON The purpo se of th is doc ument i s to co nvey u sage Inf orm ation and a broad ove rview of th e p e st man agement role s of p e sti cides that are b eginning to underg o regi str ation review. The anticip ated audi ence co nsists of the team of E PA s taff c urrently e valuating the registration s tatuso f DCPA (Dim ethy l tetrachloroterephthalate) and ev entua lly th e general publ ic . T his document build s up on the data a l ready provid ed in th e "Usage and Label Us e Data Packages" tha t are al so provided to Registration Re view team s b y BEAD . Th e do cument i s ba sed o n inf ormation and d ata av ailable to B EAD as o f De cember 1 ,2010 . DCPA b elongs to th e c hemical family of c h lo rinated b enzoic acid s . Th e m ode o f action of thi s herbicide appe ars to b e inhibiti on o f the norm a l ce ll di vision o f root tip s of a w ide s pectrum o f p l ants ( EPA, 1 988). T rade names for products c ontaining D CPA includ e D AC 89 3 , D actha l , and Dacth alor. DCPA c ontro ls many a nnua l grasses a nd broadl e afw eeds in a gronomic c rops , ornam enta l plan tings, on ions, co le cr ops, o ther v egetable c rops, o rnamenta l tur f and l awn s . COMMON FORMULATIONS AND AP P LICATION MET HO DS D CPA i s f ormu lated as a fl owable c oncentrate, w ettable p owder, o r granular f ormu lation. D CPA ma y b e app l ied via b roadcast (aeria l or g round) s pray , c hemigation , band treatment , and s oi l inje ction tr eatment. Various types o f e quipment may b e u sed i ncluding broadcast s pray e quipment , s preader , s haker-can , s prinkler irrig ation, and soi l in jection equi pment. It i s app lied as p re-emergence , po st-plant, p ost-transp l ant o r a s a layby tre atment ( EPA , 1 9 88) . U SAGE (A gr icult ure) Ba sed o n p rivate mark et s urvey data from 1 998-2008, ag ric u ltura l u sage a veraged approximately 500 ,000 p ounds for 1 00 , 000 acres ( Of!( Kynetec , 1998

- 2008) . In ge neral, D CPA i s typically a

pp l ied at a rate o f 4-6 p ounds A. 1. per acre ( OIK K ynetec, 199 8 -2 008). From 1 9 98- 2 0 0 8 , the l ar g e s t mark ets in terms o f t ota l po unds of acti ve in gredient appli ed we re: br occo li , onion s , c auliflower, c abbage , and tomatoes ( Figure 1) . T hese cr ops a lso rank ed s imilarly in term s o f th e t otal ar ea treated. Fi gure 1 . M ajor Agric ultura l Mark ets for D CPA (p ercent o f pound s A. 1. applied )

Cabb age 5"1" C au liflower 9% Tomatoes 2% Oth er crops 5%

• B roccoliC O ntons tr C auliflowe rtl C abbage- Tometoes u Other crop S ource: GfK Kyn etec . 199 8-2008 2The states w ith the mo st ag ricultural u sage in terms o f pound s A I appli ed are: C alifornia, Wa shington, A rizona, Texas and O regon (F igure 2) . Th ese s tates a lso ranked s imilarly in term s o f th e total area tre ated . Fi gure 2 . S tates w ith H ighest D CPA Us e- Per cent o f To tal Lb s AI Appli ed

W A TX O R AZ 3% 3% All others 6 %

Sou rce : G IK Kynetcc , [ 998-2008 U SE TRE NDS I

_ C A

_ W A 0 AZ 0 TX

_ OR iii AU others I

T he hi storical u sage data provided in th is se ction i s provided f or prelimin ary sco ping purp oses o nly, to convey a br oad ov erview of DCPA at the be ginnin g o f th e reg istration re view proce ss. N on-Ag Usa ge In 2000 , a pproximately I milli on p ound s o fD CPA w as u s ed by co nsumers usi ng lawn herbi cide pr oducts and an a dditional 1 .8 million pound s was f rom co mbination h erbicide/ fertilizer pr oducts (Kl ine and C o. Inc . , 2 001) . U s age was n ot rep orted in th e m ore c urrent r eports f rom 2 003 and 2 005 , ho wever , u sage m ay have b een o c curring belo w the reporting thr esholds o f abo ut 4 00,000 poun ds f or the h erbicide /fertili zer co mbination product s and 20 0,000 pound s f or th e herbic ides. Use of DCPA in nur series i s l ow w ith o nly 7 00 p ounds reported in 20 03 and 2 ,600 p ounds in 20 06 (USDA NASS , 20 01-2007) .

3

### Agricult ural Usage D CPA u s age h as be en v ariable ove r the 1998 -2 008 tim e p eriod (Fi gure 3 ) . Figure 3. Pound s A.!. A pplied (1 998-2008) 80 0 . 000 ,- - - - - - - - - - - - - - - - - - - - - - - -



## o 1998 1999 20 00 2001 2 002 2003 2004 2 005 2 006 2 007 2008 

# I

_ Brocco li . Onions 0 C auli flo wer 0 Cabbage . Other 

# I Sour ce : G fK K ynetec. 1 998 -20 08 

### B IOLOGICAL ASPEC TS RE LEVAN T T O DCPA Ac cording t o a pub l ic ation b y th e Un ivers ity o f G uelph, as o f Dece mber 20 09 , n o w eeds we re reported t o b e r esi stant t o D ac th a l h erbicide (U niv . of G uelph, 2009 ). H owever, 13 bio -t ype s of ri gid ry egra ss (L atium rig idum) h ave s h own so me le vel o fresis tance t o D CPA ( McAlister e t aI. , 2 009 ). 

### HISTORY O F BEAD ASSESSMENTS F OR DCPA BEAD h as n ot c onducted a ny b enefit s asse ss ments o r Sec tion 18 a na lys e s f or th is ch emic al. 

### DATA NEEDS RELEVANT TO BEA D'S F UTURE WORK ON DCPA C urrent u sage d ata fo r n on.ag. DC PA u ses (lawn h erbicides / fertili zers). 

### REFE RE NCES Dac thal F lo wa b le He rb icide. AMV AC. 4 1 00 E . Was hington Bl vd . L os A nge les , CA 9 0023. U SA. http: //www.amvacchem ica 1.comlmedialpdf /produc ts /spe cimcn label sJdacthal flowable.pdf. Accessed on Nov . 15 , 2 0 10. 4DC PA ( Decthal) H erbicide P rofile . 1 988. E PA Pe sti cide Fact Shee t. http: / /pmcp.cce.comel l.eduJprofileslherb -grom hrcg/da lapon -ethephon/dcpafherb -prof -dcpa.html Ac cess ed o n Nov . 1 5 , 2010 G fK K yne tec . (1 998-2 00 8) . E PA Pr oprietary D ata . EPA Sec tion 18 D atabase . A va ilable at http: / /cfpub l.epa.gov /opp ref /sectionI8 /search.cfm K line and C o. Inc . (2 001). C onsum e r M arket s for Pe sti cide s and Fe rtilize rs. M c Alister , F . M ., J . A. M . Holtum , and S . B. Po wle s. 1 995 . Dini troaniline herbicide re sistance in rigid ryeg ras s ( Lo lium r igidum) . W e ed Sci ence . 4 3: 55 -62 . US DA NASS (2 001-200 7). Agr icultural C hemical U sage- N ursery a nd Floriculture S ummary . http: //usda. mannlib .come II. eduJusdainas sJ Ag ri C hern UsNursF1 0 // 2000s/2004/AgriChernUsNursF lo-09-15-2004.pdf . A cc e ss ed o n De c . 3 , 2 010 Un iv .o fGuelph . 2 009 . W eed s Re sistant to Herb icide s. h ttp:// \V\ .. w.uoguelph .calplant/resistant

weeds /assets /resistant weeds herbic ides 2009.pdf . A cces se d o n N o v. 15 , 2 010



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