# CO OP BUTYL 400

- EPA Reg No: **1381-114**
- Registrant: WINFIELD SOLUTIONS, LLC
- Signal word: Caution
- Active ingredients: 2,4-dichlorophenoxyacetic acid, butyl ester (55.4%)
- Label accepted: 1982-11-05
- Source PDF: https://www3.epa.gov/pesticides/chem_search/ppls/000912-00033-19821105.pdf

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1_-72 pt. 
A 2,4-0 Weed Killer-- 48P t. 
For Controlling Most Kinds 01 Broad· -18 lit. 
leaved Weeds on Farms. 
ACTIVE INGREDIENT: 
2,<1-Dichlorophenoxyacetic Acid, Butyl Esterst . _ •........ _ •.• !'S.4% 
INERT INGREDIENTS ........................ , ........•.......... 44.6% 
Tola1 ....................•........... __ .............. 100% 
2.4·Dichloroph~~o .. yacetic A,c-d Equivalent!: 44.2%-3.161~-·~ 
j Isomer Specillc by AOAC • .1etlood No. 6.001-5 .~--;."·1-'.D· 
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~". r r"?"3 
'.r1j.--:J 'C~\"~ 
Keep oul of rei!ch 01 c'Ulstren - 12 pt. 
CAUTION - 18 pt. print size 
In CaS!! 01 cont,lel, wash skin >"!'Ih soap and watl' •• !o. (!~I!'; fluSh ",Ub waler for 15 
"un u!cl> and gel medical .. \1(:nl10"_ ~ 11 pt. 
~;, ,> s,_~" P''''l'1 !C" '\CLhl1<'".li Pf~(",1LJ1'''''.,,)- 5:,lh'1L1>-I'I: 
Net Contents 
E P_A_ i1cgrSlralr<Jl No 312,33 
E P fro [';\ilbllshnenl No, 464-MP 
1,13'" ',,, :""'(1 fo' 
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FARMERS UNION CENTRAL EXCHANGE,INC.;-" pt. p",t ,'" 
St. Faul, Minnesota 55164 
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PRECAUTIONARY STIHEMENTS - 12 pt. 
I,AZIIRD 10 HUMflNS i. l!QM[STtC flWr,tflLS - 12 pt. 
/lRpt. 
CAUTION; '1,I'ml,,1 It ~' ... ~I',' ... ,'<I ,\·",,,1 <;,,"l~ct witt, ',r_''', 0,r~ or 
cio',hn-,; ,\",,,1 ! r,' I:"''''; _ .".!\' ,,1.>'1 ',V,\-,', U''''''U<lhly alkr ~Jndllny 
• ENVIRONMFNlAL HAZAR[) 
IX> nOl .'pply ctll''<'Uy \u ,,.,1,,, 
'-">i"i'-.n; ',","'" '1",-, L "" 
- 12 pt . 
10 nuL "pply ,.1wll w<'"lhel 
.j ,,,,'d. 
DIRECTIONS FOR USE - 18 pt. 
" ,S " ·",)1.1:"-"1 01 I"<!",,,I ',I,".' tf' "~,, lI"~, j:"',:LJcI '" a m:lnn", LnconS;',!Cn! 
.,',In "~ i"j'c'''''<l 
STORAGio Ii. UISPOSfll - 12 pt. 
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0>!('1:\,:,- l',J ""l ,-,>'11.,'11 ""~" -.'. lT"f, "",,! '" k.·.1 Ily 5torag'". dj~posal or 
~:"~ .. "\' 0' "~L.I;'I1\~"\ t't) 'wi ,;:'''_' 'le'." <lll',·, I-~~I";"i<:s U' ~eeJs 
l'n"liclde llisIX}!,,,l-!,,,,,lkidc, q)cay ""xlu,,,, O~ ,ltl5C W"tur 
,lh"t ,-.mnot be w; .. <:1 acc,,,d1.nq to ],.1)0,,1 In''tructlons roll"l be 
d'''PD''"u "j ""conlinq to f\od<n"l Of "pp,ov<xl .~t"k P'o<;,'ClUH"; 
und"r -""bt it k C oj the fu,,;oUtr'" Com;'" v,.t i<m R<~-ove, Y /let, 
CC "I ~I ,.~, eI, S','''~" I r 'I 1"'5" .11 II .... "11'1'1 'I c"nl";f\~r "'Ill I' I 'N lor 1<)~G Co'j,-
1,.)',I"q 'T JU (""~ q.dl"., ":""1 ,I'U'''<' t' 1:"Il",';" ('~nl~'m" \ r,mes U",) al-
I .. , b, ",.~',L:;"'4, ",-"n(l'I,"n,"~ r" ~"'~'O ",I '" "111"",etll"" :1111 'Jf hurl H. 
~.1h' pl."" l;l,r;~"11 \".1, '.11 ~\.,t", '" lu~.'1 ,k;I''-''"I.'ul'l''''''''~ lOf aIlP"l"I-
l'(t ,n!",!'"t,\ ' ""J~ ,'d,,,,, •• or (3) I'l~"ti .. ,:ontiliner may h­
In'·l1\,,'-~t~,.l If ,~11o·",(,.1 ]JY ';1 "t<, ",hi ],w",l <lllt\torit;(·" 
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8EST DOCUMENT AVAllABLl 
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9 pt. 
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Body 
Heildinqs 
9 pt. print sile 
10 pt print sile 
PREClI'!CION J\L USUA!UO: Si uflten no 1<:,<, ingl<"s. no usc cste 
pl"mlucto hil"ta Ql!C' la etiqueta Ie haya sido cxplic~da ampli1\ltl,::mte. 
TRANSLATION, (TO Til" USER: If you cllnnot read I':ngli"h, do not uae 
this prorluct until tile 1"be1 ha" becn fully ('xplained to you.) 
I1EED LIST 
Usc CENEX 1>UTY1. 400 to control m"ny brolldleaf 
bi t teIW<:'<:'u 
d(,cks 
I arnl"'qua rt e r!l 
mu"tards 
pigw('cd 
thi"tlc" 
wi 1d radish 
broomweed 
galin"oga 
locow<:'cd 
net.tle" 
plantains 
vetch 
tUII'.hl ('weed 
croton 
henbit 
mallow 
pennywart 
ragweed 
wild '3,,1"1ic 
weeds inclmling, 
dandelion 
kochia 
marshclder 
peppergr""s 
"hepherd"pur"e 
,~ild anlon 
<11 "0 certaln 
sandsage 
2,4-D sllsceptil,le 
eldurberry 
'~oody plants 
lucuat 
such an, 
"umac and wiilow 
USE PIREC'fIONS 
Apply CENEX BUTYL 400 "''' wilter or oil "pray <1urin'J Warm weather whon 
weed" are aetiv<:'ly qr-owing. Applie"tion und"r dr-ought conditions 
orten '~ill give' poor r-esults. U,," l()\~ "pr-"y !)re~HiUrc to minimi?c 
spnl.y dri.ft. On cropl""'l and along ro"d8i<1e3, do not exceed 20 p"i 
!,re,;"uro. Apply. enough "pray volume to provide unifor.n covera<;Je of 
'''c<,d"" usu"lly ') to 2U gallons per "ere by 9round equipmcnl and 3 
to :; gallons per itere hy' airerllrt. lIigher 'J"llonage lIlay b,' u"cd if 
dp';jr.'d to improv" sprily oO\'er"g<:, ,-,n<1 r-ed'lCC' drift. 
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GC!lcritlly, the ]ol~cr d03ag,-,,S rec{)lIlm,'ndcd on lhl" 1111> .. 1 will he 
,;<!.ti"faetory for young. >:uccn] ,'nt grO\-Jth of "cn!litive weed specie" • 
I'or Ie"" sen"itive "peeie" ;and under <-,0,,<11I:ion" where control is 
mOrC difficull. til" higher dO<;<lg"" '~ill be nc",kd. For crop uses, 
do not mix willl oil or other adjuvanl>: unl",,!! specifically recommended 
on this l"b".l. D('<'p-rouLed, per"nnial "'eed" "uch a" C.;mada thi!,tlc.· 
lind field bim1<~c~'d "nd mllny woo(ly 1'11'1111-,; t,su"lly require repeilt"d 
"'pplic"lions for miximum control. llo not "!,ply C1:Nr:X BUTYl. 400 
,"herc spray drift m<'ly contact nellrlly susceptiiJle crop" or oth(,r 
d<'f;i,n'tblc plants or ~\"Y contamin'llC' W;;:I!c-r for irrigation or (bme:;tic 
US". Do not IIpl-'ly in the vicil\ity of 2.4-1) ",-,w,itive crops or 
orniln'ental plants "ince v;apor" from this product may cause injury" 
to "ucll crop" or plant". 'rhis is <l high volative 2.4-D este!' 
formulation. R"ad ami follo'~ all U"" Prceautions 'Jiv"n on thi" 
label. 
Nan.:: If th<:',,! arc unc,'rt"in!:i<''; eoncernin'J speci<11 10eal ""e 
sitlmlian') or "l"'cifie <'rap variety toler"nc"fJ to 2.4-D. cQl\u.u].t 
your "<JrieulttH.,l F.xIlerin',{'ntal S!"tion or Ext"nsion \~('('d 5!,,~;ci"li"l 
for ,,,Iv ie". 
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Body 
H!!~dings 
9 pt print size 
10 pt pfint slze 
TO PREPARE TlJE SPRl\Y, ill Fill th,,' spray tllnk /!Ibout half full with 
wllte', then add the required Mlount of CI:;Nl::X IJUTYL 400 with ngitlltion, 
,md finally the rest of the water. 
NOtel CENl::X llU'l'\'L 400 in \~ater forms im <.:mul"ion which tends to 
""par/!lte unless the mixturl; is kept agitat"d. (2) If oil is added, 
fin;t mix tnC' CENI::X IJU'l'VL 400 lind UIO oil /!Ind then /!Idd tili9 mixture 
to the W<lttlr wi~h il'Jitation. However, wilh adL'quat" Zlgitation. thf' 
uil clIn he lidded after the CENEX flUTYL 400 is mixed in the water. 
(.l) If oil almle is ufled liS the ean:ier, a solution is formed and 
,;eparation docs not occur. Po not allO\~ lIny water to get into thc 
oil_herJ,icide mb<ture to avoid formation of <1n invcrt emulsion. 
WEED CONTROL IN S~lll.LL GRAINS NOT UN]}Emn:FJlF.!l WITH A LEGUME, NOTE, 
W"'leX if; xecOlnn!cnded to make up the spr",y. If oil is useu., there 
iu gH'ater risk of crop injury <1fld of spra~, drift. Do nOI permit 
dairy anUllals o~' me>tt animal" heing finished for slaughter 1'0 forago 
or graze treated gr",in fields <'lilhin 2 weeks after treatnlCnt. 
I'Ihe<Jt. !l,ulcy. and Ryc, Apply!.i to 1 pint per acz:e. SpJ:O\Y \~hcn 
gratn is in fut! tiller st",ge (u~;ually -: to 8 inches tall) but before 
the l)oot .',ttl'lL' amI '~hen weeus arl> ,<;1[1..'111. Do not apply before the 
tiller sta'l" nor from early boot to the dough "tage. Higher rilte" 
may be req,lin,d to control certain \~ecds but crop injury may result. 
Spring Sce<l",d Oats, Aflply J. pint per aCre at th(' full tiller "tage 
),Ut before t.he early boot stllge. O"tfl ar<' le"s tol",rant. to 2.4_1) 
than wheat or barley and ",re marl> "u"ceptible to injury_ 
Preharvcst 'rr<'lltment, Apply 1 to 2 pints per aero \~hen qr",inn 
IIr" in the hllrd dntlgh stil']e to cnlltrol lar<Je <~e"t1s th"t nlay intcre_ 
f"rc '~ith harv,,"t. fl"'lt rc.']ult" will be obtained When soil moisture 
i:.; su[fieient to cau,-,c ,-,uceulenl wcell qrowth. Nole, 1)0 not fecd 
tre",ted straw to livc:.;tock • 
WEED CON'l'ROL IN CORN: Ua" one> 01 the follOwing three prQ,]r"m!). 
Preere<.-rgencC', Apply 1 to 2 quart,; per >.len, to Hail anytime after 
pl'ln'iing hut bcfore corn <,,;\crgos. V<> not Use en light ""ndy "oil. 
Emcnjenee, Apply 1 pint per acr" wheIl corn pl<1nts >.Ire jllst brc"king 
ground. Po';len,er'l<,"e", After emcr<Jcnce of corn, usc" pint per 
aen>. Appl ie"t ion of 3/4 to 1 l'ini p.'r ,~cre may he ncc,kd for 
n',",xilTlum "ontrol of some wecds hilt ,;uch rate" m<1y causc injury lo 
th., corn. If corn i" over B inehes t,,11. 'lEa' drop n07.7.1(;3 to Ia,,,p 
the sprily off thc eorn'fo1ia'lc as ml1eh '1;; po,;"il.Jle. Do no\: IIpply 
from the tasflcling \0 r.iouqh .']ta']e. Do noL w;e \~~th atra>,i .... , uil. 
or oUll'r ildjuv,mts. Orop injury i" mO)"" likely to oceur if corn is 
qrowin'l rapidly under hi"h t<-'mp\n~turc aml high ,;oil mo.isture " 
condition". TO r"duce break""" of ;;llllk', from tCI"pOrary brittlenc.;" 
cilu,u,d hy 2.'1-0. d",l'1Y cultivClti.)jl for 8 to 10 d<1Y" aftpi" l~·"aLment. 
Not<': Ilyhrids vC\r'l ill rcspon,,,' to ~ ... -o and some ,~r" easily injur,,';' 
Spr"y only v"ri"'tie~ known to be' to1c'rmlt to 2.4-0. Cont:1l.cl ><,,-,<1 
eomp~ny and r:xteIl"ion Sen'lee IkL'd Sp"eii'llists for this i.nforn'i'ltioll. 
1'l!-:t:U CONTROL IN GltJ\SS ~!-;Efl CROPS: 
the lIn-ounl <If \J«!.<-,r l'cquircJ for uniform 
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to 1 r, pint" per acre l-n 
<11'1'] iCi'ltiQn by tlir ot" 
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Body _ 9 pt print size 
Hcadin<)s - 10 pt print Sill' 
ground ('quipmont. Apply to eat<lblished atands in the spring when 
<1r1169 if' in the tiller to early boot stl1gc. Do not spr<ly in boot 
"tage. New spring gecdings may be treated Hith tlw lower rllte 
after the grasses have lit least rive leaves. Pc.:cnul<ll wced r('growth 
ahould be trea.tcrl in the fall. 
~"Er:;n J\Nl) D)tUS!! CONTROL IN Ri\NGEI.AMJ ANI) GRASS PAS'I'URBS; N(1l'};: Do 
not '1ra;!c dairy animals on treated areas within 7 d<'lYfl /!Iftcr a.pplica­
timl. Do not use un bent gr<lSI>, alfa1f", clover, or other legume,;. 
Do not us<::- on nOl'll1y semlcd ar""lS until gr ... s" i" well est/!lbl i';hed. 
Po not usc from eillCly boot to milk stag(' whore <;IlCa"" "eed producl ion 
is,desired. 
Bittcrwced. Broomweed, C((lton, !Jocks, Kochia, Marsheldcr, Muskthiutle, 
and Other Broadlcaf Weeds. Usc 2 quarts per acre in the amount of 
water needed for uniform application. If the \~eeds /!Ire young and 
growing "ctively, 1 quart per /lcre will provide conlcrol of "orne 
npecie". neep-rooted pen:mnial \~eed>; mOlY require repe"ted treiJ.tmcnt" 
in the "an", year or in subncquent year>;. 
~1ild Gilrlic and Ihld On10n: Apply 2 to 3 quarts pur acre, m"king 
Ichn'L' applications (fall-"pring-fa]l oy· "pri.ng-fall-spring) <;tartin<J 
in lat .. fall or early nprjn<J. 
I·IEW CON'l'I<OL IN NON-CROP All.F./,S SUell liS FENCE nm.s, Li\I~NS, PARKS, 
AIRFIELDS, ROADSIlJ£S, VACANT LO'I"S, URArNAGE DI'rel! BANKS; Apply ll .. 
to 3 qu"rt" per "ere in t.he amount of \~ater needed for uniform 
eoveraqe. Usually 2 qUilrta per ,~ere provi<les good weed control 
under avera~J(' conditions. TrL'at when \1eeds are young and qro\1inq 
~'el]. Do not use' on yo] f gree",; ne>l' on dicll<mdra or other iJrOlldleaf 
iwrbaceous 'Jround cuver". Po not U"L' on ereepin'l 'Jrasses "ueh a" 
hem!: and St. Augu,;tine eJ(eept for upot treat iny, nor on newly st-eded 
turf unt i 1 grass i" \~cl1 estahlished. Reneeding of t.r"'lIted area'l 
"hould be delayed (ollowin<J treillmcnt. Ihth sprillg application, 
reseed in t.he fall; I~ith fall I1ppliciltioll, re,;eed in the ~;prinq. 
Le<]urnes arc usnally dam'hJN1 or killed so do not trCilt. areas where 
the lc,]un,es are desired. Veep-rooted I>('renllial weed" may require 
repe"ted treatment.s in'the sillUe S('.:ISDn ()r in ,;ubf;cquenl years. 
WOOUy I'LI\N'I' CON"I'ROL IN NON-CROP ARElIS: 'fo control fJpeci"" fJuscept­
ibI<' to 2,·1-0 in lCi'Jht-of-WilY", feneenMB, roadsides, and <llon<) 
drainage ditchbank6, "pray brush up to 5 to 8 feot t"ll "f':er 
sprill<j foliage iu '1e11 c1evelop('cl, uuing ] t.o 4 quart>: in IO~ ~!"'l1c'n" 
of '1a~er ... n,1 "·L"tt~n'J all parl>: of t.he llru«h' including foli .. gc, 
stems ilnd b"rk. 'fhis may require up 1.0 400 gallons of >;pray per 
."leI:<' fot ild('qu,~tc covcragc of sol;,d >;tamls of brush. Hake applica­
tion in ,;uch ,"l way ."ls to prevent drifl of n,e sptay off th,· :>J·~a 
beinq t.r,'<>.ted. Spraying can be effeet.ive at any time up to ] we~-k.:, 
l'elo1"(, f!"ost ... '" 10n~1 "-" ,;oil moifJtar<' 1,; uuffieient for <lctl.v!' 
~!l·o\-lth oC the brn';h. Control I~ill b.' 1"s'.1 effective in mi" ··JI·tmner 
during h,,;· dry \~eatil<-r '~hl'n 5011 moisture i" defiCient :mll p1..<.lnts 
"r" not ."lct.ively 'Jr<>I1ill,]. Oil or '"'("'t.tiny agent m,,'i vb added tu the 
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Body 
Headings 
9 pt print size 
10 pt print size 
spray, if needed for increased effeetiv~n~9s. 
SPOT TR<:l\'X'MENT: To control l)ro'l,11ea£ w""d" i~ small noncrapland 
areas with a hand sprayer, usc J4 pint in 3 '1allons of \~ilter ilnd 
spray to thoroughly \1(,1: all \~ee(l foliage. KcC'p ~pray mixture­
agit<"lted to pr~ve-nt; s~parl'l.tian. 
USE PRECAUT IONS 
Po not ilpply CI::N~X BUTYL 400 direetly la, or otherwise permit it 
to come into conLact with cotton, grllper;, fruit trees, ve'letilbles, 
flo'"er,; or other desirable Cl-Op or orn;1ment"l pl"nt", Which lIl"e 
sen"itive to 2.4-11 herbicide. Do not pCl"mit spray mist contllining 
it to drift onto them. since ('v("n v('ry f;milll quantities of the 
sprllY. Which m;lY not be visible, can cau"e severe injury during 
both gro\.;ing <Ind dormilnt periods. Usc coarse sprays to minimi2e 
drift. 
IHth ground equipment, spray drift ca.n b .. l,-sHened by keeping the 
zprLly boom af.; low "1Of; possible; by applying :W gallons or more of 
"pray per acre; by ur.ing no more than 20 pO\lm1.; spraying pres !lure 
with flat f~n or flooding [1 lOt flOn nozzle tips; by spraying when 
'-lind velocity is lOWI and. by stopping all Gprayin') when wind exceeds 
6 to 7 miles per hour. Do not apply with h"llow cone-type in"C'cti­
cide or other nozzles that producc ~ finL'-droplet spray. \"Iith 
aireJ:lOft applica):ion. ,!rift cIOn be le~'''lmcd by a.pplying no ll'sz 
than 5 gallons of "pray per lIcre; by "sing no mOre than 20 pound" 
spray pressure <,t til<' no?zles; by using nOZZlef; which prodUce" 
coarz" Sprily pattcrn; and by "prayinl! only \~hen lhe wind velocity if.; 
1<>s5 than 5 mil,'s per hour. 
Applications by air~r"-ft, ground ri'J ,:md h<'ln<i diq,en<>er "hould be 
carried out only \vhen there is no 1w.7"ni from sprny drift. Ilo nol 
"!lPly in the vicinity of cotton, gra!>,><;. tomalo"", OJ: other de"ir"ble 
2,4-0 susccptiblL' crop or oJ:namentill veqct"tion. Po not sprily when 
the ,~ind is blowin'] tow"r-d sU';ce-ptjbje cr-op" Dr orn"mental plants. 
V ... pors frUIl thiH pl:oduct may injun" ,;w,ceplU,le plants yl:owing nearby. 
Do not usc in OJ: ne"r 10 ",reenhou",'. ,;xcL,,,,,ive tlmount!; of this 
h"rbicide in Lh" floil may temporarily illhibi l "eed 'lermina.l ion or 
pI"nt 'Jrou!"h. Do not contmuinate il-ri'j",\-ion <ii.tche;-; or Wilt.'J: usc,! 
for ,rri,]at ion or domest ic purposes. 
ThiG product is toxic to fish. Do not apply directly to lakc~. 
HtJ:eams and pond". Do nol conli\ll\inale '1IOtel: by cleaning of 
"quipmcnt or disposal of wastes. 
'ro lIvoid lnjllJ:Y to desirable plants, do not 1"111(11e or ilpply {)lhC'l" 
'Igricultural ch"micals \~ith th" S"-lne equipment u~cd for CENEX llInYI. 
400 except <cis "peeU ,,,ct on this l"bcl. 
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Body _ 9 rt print size 
Headings - 10 pt print size 
Local cond:l.tiol'ls may /If feet tho usc of herbicides. Consul t your 
State Agricultural f:xpcrimcnt Station or Extension Service weed 
r:;pcci,llista for advice in selecting treatments from this label to 
bCllt fit loca\ condition,,_ Be' 'lUre th<lt use of thill product conforms 
to all appli~nblc regulations. Apply thin product only as specified 
on thifl label. 
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