crop-chem-docs/corpus/epa_ppls/352-568.md

# DU PONT SYNCHRONY STS

- EPA Reg No: **352-568**
- Registrant: CORTEVA AGRISCIENCE, LLC
- Signal word: Caution
- Active ingredients: Thifensulfuron (6.3%); Chlorimuron (18.7%)
- Label accepted: 1995-09-28
- Source PDF: https://www3.epa.gov/pesticides/chem_search/ppls/000352-00568-19950928.pdf

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C[U POND 
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Synchrony® STS® 
herbicide 
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" ......... A Growing Partnership With Nature"

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SYNCHRONY~ ST~ HIGHLIGHTS 
• SYNCHRONY STS provides selective 
postemergence weed control in'soybean 
varieties designated as "STS". 
• SYNCHRONY STS is a:pplied~t!herat~of 
one 3:4 ounce Soluble Pack~f41k1:e~i1'" 
See Rate. ; .. <:: 
->:;::::<:::::::\:\-:" 
.,·SYNccjiRONY:STS m~Y9tyt~~lliill.~~'~ith 
. ASStJREll, or otherprOOllctSf()rih~~e<i· weed control. . . ... . . ... . .... 
- Include.a cropoU concentrate and ¥mrio!iiuffi: 
b'lSed nitrogen fenilizer where reqllired. 
-SYNCHRONY STSmay be applied by gfound . 
(broadcast or band) or by air. 
- For ground application, apply in lo~i5 gallons 
of water at 25-60 psi. Use flat fan nozzles to 
optimize SYNCHRONY STS performance. 
• Apply to actively growing weeds at the 
recommended sizes. Sec Rate. 
• Certain erop rotations apply. 
See Rotational Crop Guidelines 
• Certain environmental conditions, such as cool 
and dry, or hot and humid we,lIher, affect the 
perfom1ance of SYNCHRONY STS. See 
Environmental Conditions. 
• Consult label text for complete instructions. 
Always read and follow label directions for use. 
,;2. j 1° 
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TABLE OF CONTENTS 
Directions For Use ............................................. 2 
Application Infcrmation ..................................... 2 
Timing To Crop Stage ..................................... 2 
Timing To Weeds ............................................ 2 
Cultivation ......................................................... 2 
Rate and Weeds Controlled ............................. 2 
Sequential Applications ................................... 3 
No-Till/Conservation Till ................................ 3 
Spray Additives ............................................... 3 
Tank Mix Applications .................................... 3 
Mixing Instructions ............................................ 4 
Application Equipment ...................................... 4 
Ground Application ......................................... 4 
Aerial Application ........................................... 5 
Environmental Conditions and 
Biological Activity ......................................... 5 
Rotational Crop Guidelines ................................ 5 
The Importance of Soil pH .................................. 6 
Sprayer Preparation and Cleanup ....................... 6 
Spray Drift Management .................................... 7 
Important Precautions ........................................ 8 
Infonnation on Resistant Weeds ........................ 8 
Storage and Disposal .......................................... 8 
Notice of Wananty ............................................. 8 
CCEPTED

) 
c[lJPO® 
Synchrony® STS® 
herbicide 
Dispersible Granules 
Active Ingredients 
Chlorimuron ethyl 
Ethyl 2-[ [[[ (4-ehloro-6-methoxypyrimidin-2-
Y I )ami no learbony Ilam ino ]su I fony I lbe nzoate 
TIlifensu IfufOn methyl 
Methyl 3-[[[[(4-methoxy-6-methyl-I,3,S-
rri azi n- 2-Y I lam ino]e arbony Ilamino I 
su I fonyl ]-2-thiophenecarbox y late 
Inert Ingredients 
TOTAL 
EPA Reg. No. 352 - 568 
By Weight 
18.7% 
6.3% 
75.0% 
100.0% 
U.S.I':1tent No. 4,394,506, 4,547,215 &4,481,029 
FOR USE ONLY ON SOYBEAN VARIETIES 
DESIGNATED AS "STS". 
• Application to soybean variclics not 
designated as "STS" will result in severe crop 
injury and/or yield loss. 
o DuPont will not warrant the safety of this 
treatment to seed saved from previous year's 
production (bin run seed). 
• TIlese "STS" varieties must be purchased from 
an authorized seed supplier. 
o 'file "STS" designation indicates the soybean 
variet),contains a proprietary trait that 
enhances the soybe,m's natural tolerance to 
DuPont soybean sulfonylurea herbicides, 
Infonnation on "STS" soybean varieties may 
be obtained from your seed supplier or DuPont 
representative. 
KEEP OUT OF REACH OF CHILDREN 
CAUTION 
PRECAUTIONARY STATEMENTS 
HAZARDS TO HUMANS 
A "'0 DOMESTIC ANIMALS 
Caution! May be harmful if absorbed through skin. 
Causes (moderate) eye injury (irritation). 
Avoid contact with skin, eyes, and clothing. Wash 
thoroughly with soap and water after handling. 
STATEMENT OF PRACTICAL TREATMENT 
IF IN EYES: Flush eyes with plenty of water. Call a 
physician if irritation persists. 
IF ON SKIN: Wash with plenty of soap and water. Get 
medical attention. 
For medical emergencies involving this 
product, call toll-free 1-800-441-3637. 
PERSONAL PROTECTIVE EQUIPMENT 
Applicators and other handlers must wear: 
Long-sleeved shirt and long pants. 
Waterproof gloves. 
Shoes plus socks. 
Follow manufacturer's instructions for deaning/maintaining 
PPE. If no such instructions for washables, use detergent 
and hot water. Keep and wash PPE sc'parately from other 
laundry . 
ENGINEERING CONTROL STATEMENTS 
When handlers use closed systems, enclosed cabs or 
aircraft in a manner that meets the requirements listed in 
the Worker Protection Standard (WI'S) for agricultllfal 
pesticides [40 CFR part 170 Section 170240 (d)(4-6)]. the 
handler PPE requirements may be reduced or modified as 
specified in the WI'S. 
USER SAFETY RECOMMENDATIONS 
USERS SHOULD: Wash hands before eating, 
drinking, chewing gum, using tohac(o or lIsing the 
L(~~~ _____ . ___ ._________ __ _ ____ _ 
ENVIRONMENTAL HAZARDS 
Do not apply <lIIectly to water, or to "reils where S\lrfY1C~ 
water IS prcs~nt. Of 10 illtCTlldal areas helc)\\" the Illean lll~h 
water mark. Do not contaminate waIn wilen disposing of 
('cjuipment wilshwatcr.l.,.

) 
DIRECTIONS FOR USE 
It is a violation of fedemllaw to usc this product in a manner 
inconsistent with its labeling. 
Do not apply this product in a way that will contact workers or 
other pe"ons, either directly or through drift. Only protectcd 
handlers may be in the area during application. For any 
requirements specific to your State or Tribe, consult the 
agency responsible for pesticide regulation. 
AGRICULTURAL USE REQUIREMENTS 
Use this product only in ,\,cordance with its labeling and 
with the Worker Protection Standard, 40 CFR part 170. 
This Standard contains requirements for the protection of 
agricultural worke" on farms, forests, nurseries, and 
greenhouses, and handlers of agricultural pesticides. It 
contains requirements for training, decontamination, 
notification, and emergency assistance. It also contains 
specific instructions and exceptions pertaining to the 
statements on this label about personal protective 
equipment(PPE) and restricted-entry interval. The 
requirements in this box only apply to uses of this 
pr(yju.;t that are covered by the Worker Protection 
Standard. 
Do not enter or allow worker entry into treated areas 
during the restricted (.ltry interval (REI) of 12 hours. 
PPE required f,'r early entry to treated areas that is 
pemlitted under the Worker Protection Standard and that 
involves contact with anything that has been treated. such 
as plants, soil, or water, is: 
Coveralls. 
Waterproof glove,;. 
Shoes plus S(xcks. 
Usc only in the fcographics identified in till" "Rotational 
Crop Guidelines" sectHm of this label. 
Make only one application of SYNCHRONY STS 
per season. 
APPLICATION INFORMATION 
DuPont SYNCHRONY STS herbicide is a dispersible 
granule formulation prcmcasurcd in 4 acre packs which 
readily Ji~;.,olvc in water. 
Timing To Crop Stage 
• SYNCHRONY STS may be applied any time after the fust 
trifoliate has opencd but no 'atcr than 60 days before SOybc~Ul 
maturity. 
Timing To Weeds 
Apply SYNCHRONY S'j'S when weeds arc young and 
actively growing (after the fi"t in,e leaves have expanded, 
but before the weeds exceed the si>£ indicaled below). 
Applications madc to weeds larger than the si/£s imlKated 
helow, or to weeds under strC\~. may result in uflsatisfaclOIY 
control. 
Applications made after lilly 1) may resuit in Ie,,>s than 
<;atisfact(lry weed control duc [0 the lar~e sizcs of the wceds 
and 1I\I..TC;\."C<l weafher stress. 
2 
Cultivation 
Do nol cultivate within 7 days of application. Cultivation 
may put weeds under stress by pruning roots, thus 
diminishing control 
If ~ 
Cultivation approximately 14 days after app!:eation will help 
control suppressed weeds. 
Rate and Weeds Controlled 
When applied as directed, SYNCHRONY STS will control the 
following weeds: 
Weed Height (in inches) 
Beg.articks (Bidens sp) 2-6 
Brislly Starbur 2-3 
Burcucwnbcr· 2-3 
Cocklebur 2-8 
Common Milkweed (above ground ponion) 2-6 
Cowpea 2-5 
florida Beggarweed 2-5 
Florida Puslcy 1-3 
Hemp Sesbania 2-5 
Lambsquartm 2-4 
Jerusalem Artichoke (above ground portion) 2-6 
Jimsonweed 2-5 
Marcstail 2-5 
~1omingglory~ (annual) 
Enlirdeaf 1-3 
Ivykaf 1-3 
Pitied I·) 
Smallnower 1·3 
Tall 1-3 
MUSlard 5** 
Pigweed.~ 
Redroot (Rou"h) 2·8 
Othc~ 
Common 
Giant· 
Sicklcpod* 
SlIlallweed 
LadYSlhumb 
Pennsylvania 
Sunflower 
Wild Poinsettia 
Yellow NUlsedgc 
Vclvctleaf 
• See Split Applications section . 
•• Diamcler 
2-8 
2-4 
2·4 
t-) 
2-8 
2·8 
t -2 
2-3 
2-8 
When applied as directed, SYNCIIRONY STS will suppress 
the following weeds: 
Weed Heighl (in inch('S) 
Ruffalobur 26 
Canada Thisllc 2·4 
Kochia 1-) 
Spurrrd Anoda t·, 
f~lrple NUlsedgc 2·4 
Venice Mallow 1-3 
Watterhcmp sr. 2 4 
I i' I

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Sequential Applications 
A follow lip application of DuPont Classic"lIerbici(k may he 
made 2-3 weeks after a SYNCHRONY STS applie-Ition to 
wntrol weeds witil multiple gennination flushes or weeds under 
~tress sUi,:h as bun.:u(;umbcr, cowpea, gi:Ult mgwecd, 
momingglory, and sicklepod. Sec Rotational Crop Guidelines 
i,,, intcl>'ais following SC{juential applications. 
No-Till/Conservation Till 
SYNCHRONY STS may be used for postemergence weed 
control in no-tilVconsel>'ation till operations. A bumdown 
treatment is recommended before planting. SYNCHRONY STS 
may be used alone, in a tank rix for postemergence broadleaf 
weed control, or tank mixed With postemergence grass hemlcldes 
such as DuPont ASSURE II Hemicide for total postemergence 
weed control. SYNCHRONY STS may be used in sequence 
With prcemerge applications of DuPont CANOPY· herbicide for 
a pre· post No-Till hemicide program. 
Spray Additives 
Applications of SYNCHRONY 5TS ffillStinclude a crop oil 
concentrate. Refer to !he. Dufool.buUetin" Approved 
Adjuvants for Use withDuPoniRow Crop and Cereal 
Hemicides" for a list ofapPmvedadjulIantS and suggested use 
rates for SYNCHRONYSTS;An ammonium nitrogen' 
fertilizer may also be required.Prod~cis that combine 
ammonium fertilizers with surf:ictants or crop oils must meet 
all of the surfactant/crop oil and ammonium nitrogen fertilizer 
rcquircmcnt~. 
Crop Oil Concentrate 
• Apply crop oil concentnlle at 8 pt per 100 gal of spray solution 
(1.0% v/v), 
lise a g(xx]-{juality, petroleum-based or methylated seed oil­
based crop oil concentrate with at least 14% emulsifiers and 
W% oil. 
Ammonium Nitrogen FertiliZl'r 
III addition to a crop oil concentrate, an amlllonium nitrogen 
fl.:rtllizcr is rcc()fTllllcnded. ami required where vclvcllcaf is 
pre~nl. 
Use a high quality, liquid nitrogen fertilizer such as 2X·0-D or 
30-0·0 at a rate of 4-H pi per acre, or a 10·34-0 at a rale of 
2-4 pt pcr acre. 
Ahcmatively. a high-quality, sprJyabic gralic of ammonium 
sulfate (ll-O·O) may he used at a rate of 2-4 Ih per aCrt', 
lise tht lower rale of fenilizcr for sPI"'y voiullics of less tilan 
I:) gai per acre. 
TANK MIX APPLICATIONS 
Do nol tank mix SYNCHRONY STS with any olher pesticide or 
spray adjuvant except as specified on this or other supplemental 
labeling. 
SYNCHRONY STS AND 
POSTEMERGENCE GRASS HERBICIDES 
SYNCHRONY STS may be tank mixed with postemergencc 
grass herbicides such as DuPont ASSURE" IT Herbicide. 
'Ih; types of grass present determine the alllount of ASSt IRE II to 
he lank mixed wilh SYNCHRONY STS. When applied as 
directed. a tank mix of SYNCHRONY STS and ASS\ lRF II w;1I 
c()ntwllile following gra\\es: 
SYNCHRONY STS + 50z of ASSURE /I per acre 
Grass lIeigilt (Inches) 
Volunteer Com 6 - 18 
Shattercane 6 - 12 
Giant roxtail 2 - 4 (preliller) 
Seedling Johnsongrass 2 - 8 
SYNCHRONY STS + t0z of ASSURE /I per acre 
Grass lleight (Inches) 
Giant Foxtai' 4-8 
Wild Proso Millet 2-6 
SYNCHRONY STS + 8 oz of ASSURE /I per acre 
Grass Iwghl (Inches) 
Crowfoot Grass 2 - 6 
Fall Panicum 2-6 
Grecn Foxtail 2-4 
Bristly Foxtail 2-4 
Goosegrass 2-4 
ltchgrass 2-R 
Field Sandbur 2-6 
Sprang Ie top 2-6 
Volunteer Cereals 2·6 
Wild Oats 2-6 
Witchgrass 2-6 
SYNCHRONY STS + 10 oz of ASSURE /I per acre 
Gras", /leiShl (Inc"es) 
~J~u~ng~l~en~'c~e~ ________________________ ~2 ~~ ____ __ 
Rhizome Johnsongrass 10· 24 
Include a crop oil concentrate with the tank mix of 
SYNCHRONY STS and poslcrner~cnce grass herbicide.s slleh 
as ASSURE II. Use the rale listed ill the Soyhean Spray 
Additives section, 
SYNCHRONY STS may be lank mixed with olher grass 
herhicides slIch as Poast Plusl , Sclcctl, FlI~ion" or 
I:usiladc~ 2{X)O. RC',d and follow lahcl directions for any tmk 
Tllix product. 
Under certain conditions SYNCHRONY STS may reduce the 
activity of the grass he:bicidc, n,e broallieaf activity of 
SYNCHRONY STS will not he affecled. 
For hest reslllt.s apply SYNCHRONY STS eilher 7 llayS her." ,­
or I day afler Ihe grass herbicide. Refer to Ihe grass hcrbicilic 
label f()f precautions anL. specific usc information. 
SYNCHRONY STS and 2,4-0B 
SYNCHRONY STS may be tank mixed with 1·2 fl ('I per 
acre of2,4-DB for improved control of giant ragweed, 
allOual momingglory and other broadleaf weeds. 
Applications to momingglory species Olusl he made hefore 
the weeds arc 4" tall. 
• Soybeans must be at least 8" tall before applying 
SYNCHRONY STS in a tank mix willi 2,4-DB. 
Applicalions of SYNCHRONY STS and 7,4-DB mllst include 
a llo11ionic sur1'act~mt at the ralc c." 2 pinTS !X=f 1 no gal 
(minimutll or O.125t;{ \'/v of actual Ilonionic surfactant) or crop 
(lil COIKcntratc at H pinTs [X'r Ion gal of spray s(lillli()fl (I.()':;-' 
v/v). See Spmy Additives. 
Apply a tank rill.' of SYNCHRONY STS and 7A·DIl hy 
ground only.

) 
In Kansas and Missouri (c :ecpt the boothecl area), when 
conditions are excessively hot ali<I dry ( ,. 90°F and < 30% 
relative humillity), make applications at the rate of 2 n 07. of 
2.4·DU and SYNCHRONY STS. 
The use of crop oil concentrate may innease temporary 
iliJury to soybeans. 
Some crup response may occur 5·7 days after application of 
SYNCHRONY STS and 2,4-DIl to soybeans under stress. 
Temporary yellowing, leaf crinkling, .anJior soybean growth 
retardation may occur following application of SYNCHRONY 
S1'S and 2.4-DB. Under favorable growing conditions, tlle crop 
will quickly recover. , 
Consult the 2,4-DB label for usc precautions. 
SYNCHRONY STS AND COBRA' 
SYNCHRONYSTSmaybctank mixed with:'Cobra"at 
the rate of8,Otol2.SflozoC·Cobra"peracr-e. Use the 
higherrateof"Cobra" when weed popuJationsare heavy Or 
weeds approach themaximuin size listed below. 
Weed Height (Inches) 
Prickly Sida (tea weed) up to I inch 
Cocklebur 2-6 
Hemp Sesoania 2·4 
Momillgglory 
Pilted 2·3 
Ivyleal 2·3 
Entirel.af 2·, 
Include a nonionic surfactanl al2 pt per 100 gal (If spray 
solulion (minimulll of 0.125% vlv actual surfaclallil. 
Do not usc crop oil <:oncentrate when LWI.: mixing 
SYNCHRONY STS and "Cohra". 
Tank mix applicallons of SYNCHRONY STS and "C"llIa" 
may not control weeds listed on Ihe SYNCHRONY STS 
label as complelely as applicalions of SYNClIRONY STS 
alone. 
Appli,'ations made wilh less Ihan 20 gal per acre spray 
v()lume may f(',sull in erratic weed control. 
Tank 1\lix Precautions 
Do ooll'U1k mix SYNCHRONY STS wilh allY olher pcslimk or 
spray adjuvant except as spccifled on this or Olhcr supplemental 
Iaheling. 
MIXING INSTRUCTIONS 
Soluble Pack) me cOlllaillcd in wall'rproof. resealaole plaslic 
hag.'. wilh plastic bags enclosed in a cardbo'ml oox. The 
individual Suluble Packs will dissolve complelely in waler. Open 
the outer Icscalable pla .. \lic bag. remove the numocr of required 
Soluble Packs Ii)! Ihe application mlc of one 3.4 ounce Soluillc 
P:lck per <1 trca!cd acre,"", <lnd drop Ihrln into the spray t;Ulk a\ 
directed helow. 
/ 
Ie. / I c· 
Solubie Pack lIandling Precautions: 
The outer reseal.ble plastiC bag is NOT soluble in water. 
DO NOT pJace it in the spray tank. 
E"'c,,ive handling of Ole packs, or exposure to moislure, will 
cause breakage. 
Do not touch the packs Witll wet hallds or place them on wet 
surfaces. 
Protect unused Soluble Packs by resealing them in the rescalable 
bag. 
To Use the Soluble Packs: 
I. Fill the tank 1/4 to 1/3 full of water. 
2. While agitating, add the required number of SYNCHRONY 
STS Soluble Packs ( one 3.4 ounce Soluble Pack pcr 4 acres). 
3. n,e packs should dissolve completely wiOlin 5 minules. 
Continue adequale agitation. 
4. SYNCHRONY STS should be thoroughly mixed with 
water in the spray tank before adding any other material. 
As the tank is filling and after Ole Soluble Packs have 
dissolved, add (in order): other herbicide(s), tl,e required spray 
ad juvan~ and the nitrogen fertili7.crwhere required. 
5. Apply SYNCHRONY STS spray preparation within 24 hours 
of mixing to avoid product degr'ddation. 
6. If Ole mixlure has scllled, tJlOroughly reagitate before using. 
APPLICATION EQUIPMENT 
Ground Application 
(See Also Spray Drift Management) 
Broadcast Applicution 
Usc a minimum of to gal waler per acre, 
Under heavy weed pressure or dense crop foliage. increase 
minimulll spray volume 10 15·25 gal per acn,. 
lise flat fan n",,,les at 25-60 psi for SYNCIIRONY STS 
applicatiulls. 
1)0 not liSC tl()(xl, rain df{)p, whirl challltx'T, or I..'ontmllrd 
droplel applicalor (CDA) type nozzles. Unacceplable ccop 
injury, excessive spray drifl, or P<)()T wC'ed control Tll3) r(:sult. 
For proper spmy coverage adjusl the boom ,md nonle height 
according to the slX'cificafions listed hy the 1l0J.I.\e 
Ill,mufacturcI. 
Baml Appiicatiofl 
Because b,md applicators spray a narroWCf area tJ,an broadcasl 
applicators. usc ProlX)rtionatcly less spray solutioll for h:md 
applicati()fls. 
Carefully calihmlc Ihe hand applicator 10 not excced Ihe 
Iahelcd r,Ilc. 
Flat fan nozzles arc recommended. 
Carefully follO\v the n()/./.h..~ mtlnufactUlcr's instructions for 
I}()llle: oricntati(lIl. distance of the TH1UirS from the: crop and 
weeds. spray volumes, calihmtion. and spmy prc:,sure for hand 
applicai;OJls. 
For ad,iitional illfoTlllatinll Oil rm\' handers, sec DuPollt 
bllllctin, "Appll«lt]('Tl Accuracy· Row Banders:' 
.. ; 
!' 
I

Aerial Application 
(See Also Spray Drift Management) 
{f\c nou.lc Iypcs ami ammgcllu.'nls lhat will provide optimunl 
spmy tiislnbulion and maXillHIIl} covcmgc at 3 .. 5 gal per acre. 
U.\('. a millimuJIl of J gal waler per acre. Under heavy weed 
pressure or dense nop foliagl\ incrcti'\C the minimum spray 
VOItIllW to,) gal per acre, 
Do not apply during a IcmPl'r.lture inversion, when winds are 
gusty, or when other conditions could produce poor covel1lge 
amVor off-target spr.!y movement. 
ENVIRONMENTAL ~pNDITIONS 
AND BIOLOGICAL ACTIVITY 
SYNCHRONY STS rapidly inhibits the growth of susceptible 
weeds_ Leaves of susceptible plants yellow 3-5 days after 
application, followed, in controlled plants, by the death of Ihe 
growing Ix)in!. SYNCHRONY STS will provide complele 
control of susceplible weeds in 7-21 days. Suppressed planls may 
remain green but will he stunted and noncompelitive. 
SYNCHRONY STS will provide best results when applied 
to young, actively growing weeds. Degree of control 
depends on: weed spectrum; weed .ize (ifweeds llfe large, 
use higher spray volume); growing conditions at and, . 
following treatment; soil moisture: precipitation; and spray 
adjuvants. Treating weeds under stress or large weeds may 
result in only partial control. Stress may be alused by: 
• abnonnal wcather (hot or cold) 
n~chanical injury from cultivation 
• drought 
water~sJtur.ited soil 
disease 
insect inj\lt)' 
prior hl~rbicidc injury 
Strclis affcct., .',nnw weeds, SIKh as pigwcl..'d, more than others. 
I >cby ;lppliclli()n until :.Ircss passes and weeds start to grow 
dgall1. 
SCH'rc srll~SS ~dHlllghl, disease, insect damage, or nutrient 
defi.ciency such as iron chlorosis) ."ollowing application may abo 
result in poor weed control. 
Do not apply SYNClIRONY STS if rain is expected within 
I hnur or weed contlol may d~crC~l\C. 
ROTATIONAL CROP GUIDELINES 
Imrl()f1anC Crops other than soyhcans following a 
SYNCHRONY STS 3pplicatim can vary in Iheir sensitivity to 
low concentrations of SYNCHRONY STS remaining in the 
.'>Oil. Rotational crop gUH.lcline..:; must he followed. 
When SY.NCHRONY STS is applied in sequence with 
CANOPY. follnw rotatiooal crop guidelines listed on the 
t:.\NOPY label. 
If S( 'LI'ITR. PURSUIT. or 'my pr"luct containing the active 
ingredients ima"'qllin or imal('lhapyr (such as SQUADRON 
or I' ASSf'ORT) IS applied to soybeans tht salllr. yeal as 
SYNCHRONY '<;TS, !(lilow the more restnctIVe rotational 
l rop gil idl'l1Jlt.' , 
5 
"7 Ie· 
f Rotational Crop Groups A & B 
Region A: -me states of Delaware, Illinois (Fields south of 
Interstate 80.), Indiana, Iowa (Fields located outside the 
boundaries of the Clarion-Nicollet-Webster and Hamburg-Ida­
Monona soil associations and fields located outside O,e historic 
flood plain of the Missouri RiveL), Kansas, Kentucky, Maryland, 
Michigan (Fields south of Interstate 96 or per supplemental 
labeling.), Missouri (Except the Bootheel), Nebrd.ska (Fields 
south of Roule 30 and east of Route 281.), New Jersey, Ohio, 
Pennsylvania, and West Virginia. 
Region B: The states of.ll labama (Except the "Black Belt" 
where soil pH must be less than 7.0.), Arkansas, Florida, Georgia, 
LouiSIana, Missouri (Bootheel reg;()J1 only), MississippI (Except 
the "Black Belt" where soil pH must be less than 7.0.), NOith 
Carolina, Oklahoma, South Carolina, Tennessee, Texas (Fields 
east of Route 183), and Virginia . 
Follow Recrop Interval 1 if: 
TIle field is located in a "Region A" state (all pH soils) 
AND, EITHER 
A maximum of one applicatioll of SYNCHRONY S1'S al a 
rate of one ~oluablc packctJ4 acres for the groWing season is 
applied, 
OR 
A maximum of one application of SYNCHRONY STS al a 
rale of one soluablc packctl4 alTes in sequence WiOI 1/3 o7Jacrc 
ofCh>sic. 
Follow RCCfOll Interval 1 if: 
'n,e field is located in a "Region A" state wilh soil I'll 7.0 or 
less 
AND 
A maximum mtc of one application of SYNCHRONY S1'S at 
a rJIC of one soluable packet/4 acres in sequence with a 
maximum rate of :114 "dam: of CLASSIC. 
Follow Rccrop Interval 2 if: 
The field is located in a "Region fl" st,de (all I'll soils c,cept 
those with pll grealer th,m 7.0 in Vitl'illia and the fllack flell 
region of Alabama and MississippI) 
AND 
A maximum of one application of SYNCHRONY STS at a 
rate of one .solua!>lc packet/4 acres in sequence WillI .114olJacre 
ofCl.ASSIC IS appllcd.

) 
l 
Rotational Interval (months) 
Following the Use of SYNCHRONY STS' 
Crop 
Soybeans 
Ct.:rcal Grains 
~L"turc Gr:,l<';sc, 
Interval I 
Anytime 
(such a.;; l'cS(uc anLi Rycgrass) 
Dry Be:ms 
Kidney Beans 
Peas 
Snap Beans 
<) 
Held Com (IR) , 8 
J'jeld C:o_Ill"(SL1lCsin .. ~.egi()~A) . 9 
Held Com"(SL1ICS of AR, MO (Boothcel 
only), !'J(,Qj(.J"N, and..I:'<L __ .. 
Field Com**(SL1ICS of AI., A .• GA. LA. 
MS. and SC) 
Popcom 
Sorghum 
Tobacco (lransplant) 
Toma:o (transplant) 
Peanuts 
Rice 
Cotton 
Alfalfa 
Clover 
Cabbage 
CanDIa (Rapeseed) 
Cucumncr 
J-la.\ 
lxntl]..; 
Mus!~lrd 
Pumrkin'; 
Sunllt1\\'cr 
S\\'t't.'l Cnrn 
\Vaknne](lfl 
CarrOlS 
Onions 
P{)(a!c-.cs 
Sugar Reel" 
Any crop flol li<.;!l'l.l 
9 
15 
15 
9 
12 
I X 
,0 
Int"rval 2 
AnYlirnc 
3 
<) 
7 
8 
7 
9 
6 
<) 
8 
IX 
3() 
* If SYNCHROi\Y STS or the lalter P,U1 of a seqllential trratmcnt 
Lontaining chlonmuron ('thyl (such as Cl.ASSIC) is applied aftt'r 
AUj;:u\l I, extend rotJtional nop intervals 2. months for i.ll fi.ll fa, dover, 
((1m (nnn-IR\ colt(lll, pop-com, rice, s(lr[!i1um, tobacco, Jnd tomaln. 
"11K;- term "FicJJ Corn" is defined ((l include only that corn t!rown for 
grain or si1:t~e Of for s.ccd com rrblivl' 10 the Rotational Crop 
(iuidclincs ~(t!on of lhis l<I)-lc1. 
THE IMPORTANCE OF SOIL. PH 
Soil pH varies greatly, even within the same field. pH variations 
as much as 2 pH l!fllts arc commoll. ('omposlte soil \<lmplcs 
taken aernss all entire field, "!lcli <I" those ~alllples taken for soil 
fertility rCCOIlHT)(,fltl.!lIOIl:;, Illay llot dd("Cf areas of high pH. Sub­
samplJng IS rccommcnded for areas likely to have pH values 
Illgher than tIll: field dvTr.l):C. 'fllc followlflg IS a nOll inclll\ive 
ll\t of potential hi~?,h pH ,1Il':I\ \",here sub~afllplJTlg IS 
Tl'n lTJ If IH: nde d. 
\Vlll?rc different ";{id tyP('~ ;uc ('\lHICTl! wilhlll a field. sample 
\oii [ypl~~; sep;uall'I ...... 
Where conditions villy within a field, sample meas sepmatciy, 
such as: 
- areas bor\ll~rcd by limestone gravel roads, 
- river tx'IlOIl\.S subject tu flooding. 
- low areas in hardpan soils where evapomtive ponds 
may occur, 
- eroded hillsides, 
- along drain tile lines. and 
- areas where drainage ditch spoil has been spread. 
Where lime has not been deeply incorpomted, soil may exhibit 
significantly higher pH values in the upper 3 inches of soil. 
Composite S)i1 samples taken at a 6-8 inch depth may not 
reflect the elevated pH near the surface. In these C<l<;CS ,'''allow 
sampling, the upper 3 inches. is advised. 
Dctemline soil pH by laboratory analysis using a I: I soil:water 
suspension. 
SPRAYER PREPARATION AND CLEANUP 
Prior to application of SYNCHRONY STS, start with clean, 
well maintained application equipment. Immediately 
following application, thoroughly clean all application 
equipment. Postponing action, even for a few hours, only 
makes effective cleanup more difficult. Failure to clean 
spraying equipment thoroughly may result in injury to 
suhsequently sprayed crops. 
When spraying multiple loads of SYNCHRONY STS over 
an extended period of time, rinse the equipment with clean 
water at the end of the day. Leave waler in the equipment 
overnight to prevent deposits from drying on surfaces. 
When applications of SYNCHRONY STS are completed and 
prior to using the sprayer and associated equipment for other 
products or for crops other than soybeans, thoroughly clean 
the equipment using tl.e procedure below. 
S1FI' I. Drain spray equipment. n"'JOugh:y rinse sprayer. 
and fiu:;;h hoses, boom and nozzles with cil'~lt1 water. 
Loosen and physically remove VISible deposits. 
Sl1Ol' 2. Fill the sprayer with clcan water and add household 
ammonia (one gallon of 3% active for every 100 
gallons of water) Of correct amount of a DuPont 
approved cleaner'. Hush hoses. boom and nozzles. 
Turn off the boom and top off the tank with clean 
water. Circulate through the spraying system for 15 
minutes. Flush the hoses. boom ,md nozzles with the 
cleaning solution. Drain the tank. 
STEP 3. Remove and clean nozzle, screens <l'1d slr'liners in a 
bucket of frc~h cleaner and water. 
STEP 4. Repeat Sl10P 2. 
SHoP 5. l11Oroughly rinse the sprayer. hoses. hoom and 
nozzles with clc;m water, seve]:l1 times. 
Clean all other assrX:Jatcd application equiPlllellt. T;,\..:c all 
necessary safety prccauliOlls when cleaning equipment. 1>0 
not clean ncar wells, waIn source, nr ncar dc:-.ilcahh.' - . 
vc~ctati()n. f)1~P()SC nf w<l\le rinse W]!er in accordance \\'lIh 
10c<l1 rC!!UlafJonS. 
* ,,"Of ;Idditiollal mfnrm<ltioll Oil "prayer cleanup and a lJ:'IllIlg 
of f)III~()nt· approved cic;mCTs, see DuPont HulJetlll "}\ 
(,uidc To ApplicatIOn FqtJIplllcnt (']eanoul hlr DuPont 
SlIlfoTlylllrca llclhicidc<..,".

) 
SPRAY DRIFT MANAGEMENT 
The interaction of many equipment and weather-related 
factors detennincs the potential for spray drift. The 
aprlicator is responsible for considering allthcsc factors 
when making application decisions. 
A VOIDING SPRAY DRln IS THE RESPONSIBILITY 
OF ll1E APPLICATOR. 
IMPORTANCE OF DROPLET SIZE 
TIle most effective way to reduce drift potential is to apply 
large droplets (> I sO - 200 microns). The best drift 
management strategy is to apply the largest droplets that 
provide sufficient coverag~nd control. The presence of 
sensitive species nearby. the environmental conditions. and 
pest pressure may affect how an applicator balances drift 
control and coverage. APPLYING LARGER DROPLETS 
REDUCES DRIFT POTENTIAL. BUT WILL NOT 
PREVENT DRIFf IF APPLICATIONS ARE MADE 
IMPROPERLY OR UNDER UNFAVORABLE 
ENVIRONMENTAL CONDITIONS! See Wind. 
Temperature and Humidity, and Temperature Inversions 
sections of this label. 
Controlling Droplet Size - General Techniques 
Volume - Use high !low rate nozzles 10 apply the highest 
practical spray volume. Nozzles with higher rated !lows 
produce larger droplets. 
Pressure - Use the lower spray pressures recommended 
for the nozzle. Higher pressure reduces droplet size and 
does not improve canopy penetration. WHEN HIGHER 
FLOW RATES ARE NEEDED, USE A HIGHER­
CAPACITY NOZZLE INSTEAD OF INCREASING 
PRESSURE. 
Nozzle Type - Usc a nozzle ')"pe that is designed for the 
intended application. With most nozzle types, nanower 
spray angles pnxiucc IJrgcr droplets. Consider using low­
drift nozzles. 
Controlling Droplet Size - Aircraft 
Number of Nozzles - Usc the minimum number of nozzles 
with the highest flow rate that provide unifonn coverage. 
;\lozzlc Orientation - Oncnting n07lles so that the spray is 
emitted hackwards, parallel to the airstream will produce 
larger droplets than other orientations. 
Nonie Type - Solid stream nozzles (such as disc and core 
with swirl plate removed) oriented straight hack produce 
larger droplets than other noaic types. 
Boom Length - 'Inc boom length should not exceed 3/4 of 
the \\ling or rotor length - longer booms increase drift 
potentia1. 
Applkation "ci~ht Application more than 10 ft a~)(we 
the canopy ITKrCaSC"i the potential for spray dnft. 
BOOM HEIGHT 
SetlHlg tile hoom at the I()\v~,~;t labeled height (if srx'ciflcd) 
\I,:lucl, provides lITllfOTTllCflVerage reduces the t~xp()"urc of 
drpplefS to C'vaporation :Hld wind. h1r ground cquipmcnl. !he 
hoorn "hould fl'maln level ',.I,.'itil the nop and tnvc minimal 
boullc(,. 
7 
WIND 
Drift poIentia! increases at wind speeds of less than 3 mph 
(due :0 inversion potential) or more than IO mph. However. 
",any factors. including droplet size and '''Iuipment type 
deternline drift potential at any given wind speed. A VOID 
GUSTY OR WINDLESS CONDITIONS. 
Note: Local terrain can influence wind patterns. Every 
applicator should be familiar with local wind patterns and 
how they affect spray drift. 
TEMPERATURE AND HUMIDITY 
When making applications in hot and dry conditions. set up 
equipment to produce larger droplets to reduce effects of 
evaporation. 
TEMPERATURE INVERSIONS 
Drift potential is high tluring a temperature inversion. 
Temperature inversions restrict vertical air mixing. which 
causes small suspended droplets to remain close to the 
ground and move laterally in a concentrated cloud. 
Temperature inversions are characterized by increaSing 
temperature with altitude and are common on nights with 
limited cloud cover and light to no wind. They begin to form 
as the sun sets and often continue into the morning. Their 
presence can he indicated by ground fog; however. if fog is 
not presen!, inversions can also be identified by the 
movement of smoke from a ground source or an aircraft 
smoke g-~ncrator. Smoke that layers and moves laterally III a 
concentrated cloud (under low wind conditions) indicates an 
inversion. while smoke that moves upward and rapidly 
dissipates indicates good vertical air mixing. 
SHIELDED SPRA YERS 
Shielding the boom or individual nozzles can reduce the 
effects of wind. However, it is the responsibility of the 
applicator to verify that the shields are preventing drift and 
not interfering with UllJfOml deposition of the product. 
AIR ASSISTED (AIR BLAST) 
FIELD CROP SPRA YERS 
Air assisted field crop sprayers carry droplets to the target via 
a downward directed air streatll. Some Illay reduce the 
potentiai for drift, but if a sprayer is ull;uitable for the 
application andlor set up improperly. high Jrift potential can 
result. It is the responsibility of the applicator to determine 
that a sprayer is suitahle for the intended application. is 
configured properly, and that drift is not occurring. 
Note: Air a"jsted field sprayers can affect product 
perfonnanec by atfcctir.g spray coverage and canopy 
pcnetralion. Consult the application equipment section of 
tim label to detenninc if use of an alf assisted sprayrr is 
recom mended.

) 
I 
AIR ASSISTED (AIR BLAST) 
TREE AND VINE SPRAYERS 
Air assisted tree and vine sprayers carry droplets into the 
canopy of trees and vines via a radially or laterally directed 
air stream. 111ese sprayers are not suitable for applying 
herbicides. 
In addition to the general drift management prine iples 
already described, the following specific practices will 
funher reduce the potential for drift.: 
Adjust deflectors and aiming devices so that spray is only 
directed inlO the canopy. 
Block ojJupward pointed noules when there is no 
overhanging canopy. ; 
Use only enough air volume to penetrale the canopy and 
provide good coverage. 
Do not aI/ow spray to go beyond the edge of the cultivated 
area. Spray the outside row only from outside the 
planting. 
IMPORTANT PRECAUTIONS 
Do not grazetreared fields or harvestfor forage or hay. 
Do nolappljtlJisproduct throughan~typecif irrigation 
equipment 
Injury to or loss of desimble trees or vegetation may result from 
failure to observe the following: 
Do not apply SYNCHRONY STS Or dmin or flush equipment 
on or n~ar desimble trees or other planls, on areas where theu 
roots may extend, or in locations where the chemical may he 
washed or moved into contact with their roots. 
Do not use on lawns. walks. driveways, tennis courts or 
similar arcm;. 
Many crops are sensitive to SYNCHRONY STS. All direct or 
indirect contact (stich as spmy drift) with crops other than 
soybeans should be avoided. 
TIKlfoughly clean all application equipment immediately aher 
llse and prior to spraying crops other th~n soybeans. 
SYNCHRONY STS is for use only on soybean varieti,,., 
designated as "STS". 
INFORMATION ON RESISTANT WEEDS 
When helbicides with the same mode of action arc uscd 
repeatedly over several yea.-s to coniiol Ule same weed species in 
the same field, narumlly·occurring resis~mt weed hiotypes may 
survive a correctly applied herbicide treatment, propagate. and 
become dominant in Ulat field. These resistant wced hiotypes 
lIIay not be adequately controlled. Cultural practices such as 
tillage, prcvc:nting weed escapes from going to secd. and usmg 
hcrhicidcs with differrnt modes of action within and hetween 
crop seasons can aid in delaying ttlC proliferation and possihle 
dominancc of herbicide resistant weed biotyp<'s. 
0:------------,' n J 
STORAGE AND DISPOSAL 
Storage: Store product in Original container only. Do 
not contaminate water, other pesticides, fertilizer, food 
or fced in storage. 
Product Disposal: Do not contaminate watcr, food or 
feed by disposal. Wastes resulting from the us~ of this 
product may be disposed of on site or at an approved 
waste disposal facility. 
Container Disposal: Do not reuse the outer box or the 
resealable plastic bag. When all water·soluble packets are 
used, the outer packaging should be clean and may be 
disposed of in a sanitary landfill Or by incineration, or if 
allowed by state and local authorities, by open burning. If 
burned, stay out of smoke. If the resealable plast;c bag 
contacts the formulated proouct in any way,the bag must be 
triple·rinsed with clean water. Add the rinsate to the spray tank 
and dispose of the outer wrap as described above. 
Notice to Buyer: Purchase of these materials does not confer 
any rights under patents of countries outside of the United 
States. Use of this quantity of purchased SYNCHRONY STS 
herbicide is pemlitted under claim 24 of U.S. Patent 5,081,082. 
NOTICE OF WARRANTY 
DuPont. warrants that this product confonn5 to the 
chemical description on the label thereof and is 
reasonably fit for the pUrpoSe stated on such label only 
when used in accordance with the directions under 
nonnal usc conditions. It is impossible to eliminate all 
risks inherently ass(x:iated with the use of this product. 
Crop injury, ineffectiveness, or olher unintendcd 
consequences may result because of such factors as 
weather conditions, presence of other materials, or the 
manner of usc or application, all of which are beyond 
the control of DuPont. In no case shall DuPont be 
liable for consequential. spcci;:.1i or indirect damages 
rcsulting from the usc or handling of this product. All 
such risks arc assumed hy the buyer. DU PONT 
MAKES NO WARRANTIES OF 
MERCHANTABlI.ITY OR FITNESS FOR A 
PARTICUI.AR PURPOSE NOR ANY OTHER 
EXPRESS OR IMPLIED WARRANTY EXCEPT AS 
STATED ABOVE. 
Registered trademark of HASF Corporation 
2 Registered trademark of YJknt USA CorporatioJl 
3 Rcgi~tcred trademark of Arnerican Cy;tnamid Cpmp:my 
4 Registered [raden~ark of /.cncca. Inc. 
J) - 239 082995 
© 1')')5 E. I. dll Pont de Nemollrs and Company, Agricllltnrall'rndncts, Wilmington, J)('lawarc l'nl')X