crop-chem-docs/corpus/epa_ppls/100-437.md

# PRINCEP 80W

- EPA Reg No: **100-437**
- Registrant: SYNGENTA CROP PROTECTION, LLC
- Signal word: Caution
- Active ingredients: Simazine (80%)
- Label accepted: 1994-03-23
- Source PDF: https://www3.epa.gov/pesticides/chem_search/ppls/000100-00437-19940323.pdf

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UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 
WASHINGTON, D.C. 20460 
Theresa Kamicker 
ClBA-GEIGY CORP 
P,O. BOX 18300 
GREENSBORO, NC 27419 
OfFICE Of 
PREVENTION. PESTICIlES AND 
TOXIC SUBSTANCES 
Subject: Label Amendment SUbmission of 11119/93 in Response to PR Notice 93-7 
EPA Reg. No. 100-437 
PRINCEP SOW 
Dear Registrant: 
The labeling cited above and submitted in connection with registration under the 
Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA), as amended, is accepted. A 
copy of your proposed labeling stamped "ACCEPTED WITH COMMENTS· is enclosed. 
WHAT THIS ACCEPTANCE MEANS: 
Based on your certification, the Agency has accepted the labeling changes that are 
necessary to comply with the Worker Protection Standard (WPS) labeling requirements of 
40 CFR part 156, subpart K, described in PR Notices 93-7 and 93-11. Any other labeling 
changes submitted in connection with this amendment application but not directly related 
to compliance with the WPS have not been reviewed or accepted by the Agency. If you 
wish to make suc.!t changes, you must submit a separate amendment application proposing 
them. If your product is currently suspended. the acceptance of this labeling amendment 
does not affect the suspension in any way. 
WHAT YOU NEED TO DO NEXT: 
Send to EPA one (1) copy of the final printed labeling: 
• BEFORE selling or distributing any product bearing the final printed labeling 
AND 
• WITHIN oce year from date of this acceptance. 
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Princep® SOW 
HERBICIDE 
WPS 
Permanent Label 
(Booklet) 
For weed control in certain 
crops and ornamental plantings 
Active Ingredient: 
Simazine: 2-ch1oro-4, 6-bis (ethy1amino)-A-
:t.. '-~ ..2.8" 
WI'S Proposed Label 1; 
Highlighted Copy 
triazine ................................................ SO% 
Inert Ingredients: 20% 
Total: 100% 
EPA Reg. No. 100-437 
EPA Est. No. 100-LA-1 
Princep SOW is a wet.tab1e powder. 
KEEP OUT OF REACH OF CHILDREN. 
CAUTION 
See additional precautionary statements 
and directions for use inside booklet. 
Ciba-Geigy 
C1993 Ciba-Geigy Corporation 
CGA 6L46L 012 
ACCEPn:D 
-COIDIEm-s 
In F.:PA Loo~ Doled 
MAR 23 1994

-2-
DIRECTIONS FOR USE AND CONDITIONS OF SALE AND WARRANTY 
IMPORTANT: Read the entire Directions for Use and the 
Conditions of Sale and Warranty before using this product. If 
terms are not acceptable, return the unopened product container 
at once. 
Conditions of Sale and Warranty 
The pirections for Use of this product reflect the opinion of 
experts based on field use and tests. The directions are 
believed to be reliable and should be followed carefully. 
However, it is impossible to eliminate all risks inherently 
associated with use of this product. Crop injury, ineffective­
ness, or other unintended consequences may result because of 
such factors as weather conditions, presence of other materials, 
or the manner of use or application all- of which are beyond the 
control of Ciba-Geigy or the Seller. All such risks shall be 
assumed by the Buyer. 
Ciba-Geigy warrants that this product conforms to the chemical 
description on the label and is reasonably fit for the purposes 
referred to in the pirections for Use subject to the inherent 
risks referred to above. Ciba-Geiqy makes no other express or 
implied warranty of Fitness or Merchantability or any other 
express or implied warranty. In no case shall Ciba-Geiqy or the 
Seller be liable for consequential. special. or indirect damages 
resulting from the use or handling of this product. Ciba-Geigy 
and the Seller offer this product, and the Buyer and user accept 
it, subject to the foregoing Conditions of Sale and Warranty, 
which may be varied only by agreement in writing signed by a 
~uly authorized representative of Ciba-Geigy.

-3-
DIRECTIONS FOR USE 
It is a violation of Federal law to use this product in a manner 
inconsistent with its labeling. 
Do not apply this product in a way that will contact workers or 
other persons, either directly or through drift. Only protected 
handlers may be in the area during application. For any re­
quirements specific to your State or Tribe, consult the agency 
responsible for pesticide regulation. 
AGRICULTURAL USE REQUIREMENTS 
Use this product only in accordance with its labeling and with 
the Worker Protection Standard, 40 CFR part 170. This Standard 
contains requirements for the protection of agricultural work­
ers on farms, forests, nurseries, and greenhouses, and handlers 
of agricultural pesticides. It contains requirements for 
training, decontamination, notification, and emergency assis­
tance. It also contains specific instructions and exceptions 
pertaining to the statements on this label about personal pro­
tective equipment (PPE) and restricted-entry interval. The 
requirements in this box only apply to uses of this product 
that are covered by the Worker Protection Standard. 
Do not enter or allow worker entry into treated areas during 
the restricted entry interval (REI) of 12 hours. Exception: 
If the product is soil-injected or SOil-incorporated, the 
Worker Protection Standard, under certain circumstances, allows 
workers to enter the treated area if there will be no contact 
with anything that has been treated. 
PPE required for early entry to treated areas that is permitted 
under the Worker Protection Standard and that involves contact 
with anything that has been treated, such as plants, soil, or 
water is: 
• Coveralls 
• Waterproof gloves 
• Shoes plus socks

-4-
NON-AGRICULTURAL USE REQUIREMENTS 
The requirements ill this box apply to uses of this product that 
are NOT within the scope of the Worker Protection Standard for 
agricultural pesticides (40 CFR Part 170). The WPS applies 
when this product is used to produce agricultural plants on 
farms, forests, nurseries, or greenhouses. 
Do not enter treated areas without protective clothing until 
sprays have dried. 
FAILURE TO FOLLOW THE PIRECTIONS FOR USE AND PRECAUTIONS ON THIS 
LABEL MAY RESULT IN POOR WEED CONTROL. CROP INJURY. AND/OR 
ILLEGAL RESIDUES. 
Do not apply this product through any type of irrigation system. 
General Information 
Apply Princep BOW Herbicide before weeds emerge or after removal 
of weed growth. Princep BOW controls a wide variety of annual 
broadleaf and grass weeds when used at selective rates in agri­
cultural crops and ornamental plantings. 
Where a range of application rates is given, use the low rate on 
coarser textured soil and soil lower in organic matter; use the 
righ rate on finer textured soil and soil higher in organic 
matter. 
To avoid spray drift, do not apply under windy conditions. 
Avoid spray overlap, as crop injury may result. 
Since Princep BOW enters weeds mainly through their roots, mois­
ture is needed to move it into ~he root zone. Very dry soil 
conditions and lack of rainfall following application may neces­
sitate shallow cultivation. 
Princep BOW is non~orrosive to equipment, nonflammable, and has 
low electrical conductivity.

-5-
Annual Weeds Controlled 
alyssum 
annual bluegrass 
annual morningglory 
annual ryegrass 
barnyardgrass (watergrass) 
burclover 
carelessweed 
carpet weed 
common chickweed 
crabgrass (Digitaria spp.) 
downy brome (cheatgrass) 
fall panicum 
fiddleneck 
filaree 
fireweed 
fivehook bassia 
Flora's paintbrush 
Florida pus ley 
foxtails 
goosegrass 
groundsel 
henbit 
junglerice 
knawel (German moss) 
common lambsquarters 
nightshade 
pepperweed 
pigweed 
pineappleweed 
prickly lettuce 
common purslane 
ragweed 
rattail fescue 
redmaids 
Russian thistle 
shepherdspurse 
signalgrass 
(Brachiaria spp.) 
silver hairgrass 
smartweed 
spanishneedles 
speedwell 
tansymustard 
wild mustard 
wild oats 
witchgrass 
yellow flower pepperweed 
Following many years of continuous use of this product and chem­
ically related products, biotypes of some of the weeds listed on 
this label have bee~ reported which cannot be effectively con­
trolled by this and related herbicides. Where this is known or 
suspected, and weeds controlled by this product are expected to 
be present along with resistant biotypes, we recommend the use 
of this product in registered combinations or in sequence with 
other registered herbicides which are not triazines. If only 
resistant biotypes are expected to be present, use a registered 
non-triazine herbicide. Consult with your State Agricultural 
Extension Service for specific recommendations. 
Application Procedures 
Ground application: Use conventional ground sprayers equipped 
with nozzles that provide accurate and uniform application. Be 
certain that nozzles are uniformly spaced and the same size. 
Calibrate sprayer before use and recalibrate at the start of 
each season and when changing carriers. Unless otherwise spec­
ified, use a minimum of 20 gals. of spray mixture per acre. 
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Use a pump with capacity to: (1) maintain 35-40 psi at nozzles, 
(2) provide sufficient agitation in tank to Ic.eep mixture in sus­
pension, and (3) to provide a minimum of 20% bypass at all 
times. Use centrifugal pumps which provide propeller shear 
action for dispersing and mixing this product. The pump should 
provide a minimum of 10 gals./minute/100 gal. tank size cir­
culated through a correctly positioned sparger tube or jets. 
Use screens to protect the pump and to prevent nozzles from 
clogging. Screens placed on the suction side of the pump should 
be 16-mesh or coarser. Do not place a screen in the recircula­
tion line. Use 50-mesh or coarser screens between the pump and 
boom, and where required, at the nozzles. Check nozzle manufac­
turer's recommendations. 
For band applications, calculate amount to be applied per acre 
as follows: 
band width in inches 
row width in inches x broadcast rate 
per acre 
== amount needed 
per acre of field 
~erial application: Use aerial application only where specified 
in the use directions. Apply in a minimum of 1 gal. of water 
for each 1-1.5 lbs. of wettable powder applied per acre. Avoid 
applications under conditions where uniform coverage cannot be 
obtained or where excessive spray drift may occur. 
Avoid application to humans or animals. Flagmen and loaders 
&hould avoid inhalation of spray mist and prolonged contact with 
skin. 
Mixing procedures - all uses: (1) Be sure sprayer is clean and 
not contaminated with any other materials, or crop injury or 
sprayer clogging may result. (2) Fill tank 1/4 full with clean 
water, nitrogen solution, or complete fluid fertilizer. 
(3) Start agitation. (4) Be certain that the agitation system 
is working properly and creates a rippling or rolling action on 
the liquid surface. (5) Pour product directly from bag into 
tank. (6) Continue filling tank until 90% full. Increase agi­
tation if necessary to maintain surface action. (7) Add tank 
mix herbicide(s) after this product is thoroughly suspended. 
(8) Finish filling tank. Maintain agitation to avoid separation 
of materials. (9) Empty tank as completely as possible before 
refilling to prevent buildup of emulsifiable concentrate residue 
from possible tank mix herbicides. (10) If an emulsifiable con­
centrate film starts to build up in tank, drain it and clean 
with strong detergent solution or solvent. (11) Clean sprayer 
thoroughly immediately after use by flushing system with water 
containing a detergent.

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-7-
Compatibility test: To determine the tank mix compatibility of 
Princep BOW with liquid fertilizer, crop oil, spreaders, or rec­
ommended pesticides, use this test method. Nitrogen solutions 
or complete fluid fertilizers may replace all or part of the 
water in the spray in alfalfa and corn. Since liquid fertiliz­
ers can vary, even within the same analysis, check compatibility 
each time before use. Be especially careful when using complete 
suspension or fluid fertilizers as serious compatibility prob­
lems are more apt to occur. Commercial application equipment 
may improve compatibility in some instances. Check compati­
bility using this procedure: 
1) Add 1 pt. of fertilizer to each of 2 one-qt. glass jars 
with tight lids. 
2) To ~ of the jars, add 1/4 tsp. of a compatibility agent 
approved for this use (1/4 tsp. is equivalent to 2 pts. per 
100 gals. spray). Cap and shake until mixed. Examples of 
compatibility agents include Compex® and unite®. 
3) To both jars, add the appropriate amount of herbicide(s) . 
If more than 1 herbicide is used, add them separately with 
dry herbicides first, flowables next, and emulsifiable con­
centrates last. After each addition, cap and shake until 
thoroughly mixed. The appropriate amount of herbicides for 
this test follows (assuming a spray volume of 25 gals./A: 
Dry herbiGides: For each pound per acre add 1.5 tea­
spoons to each jar. Fluff up 
wettable powder products before 
measuring. 
Liquid herbicides: For each pint per acre add 0.5 teaspoon 
to each jar. 
For a spray volume other than 25 gals./A, change the tea­
spoons added to each jar as follows: 
25 qals. X no. teaspoons qiven above . -des1red gals. spray volume per acre 
teaspoons to add 
to each jar 
4) After adding all ingredients, l'ut lids on and tighten. 
Shake jars vigorously 1 minute. Let the mixtures stand 
15 minutes and then look for separation, large flakes, pre­
cipitates, grease, gels, medium to heavy oily film on the 
jar, or other signs of incompatibility. Determine if the 
compatibility agent is needed in the spray mixture by com­
paring the 2 jars. If either mixture separates, but can be 
remixed readily, the mixture can probably be sprayed as 
long as good agitation is used. If the mixtures are incom­
patible, test the following methods of improving compati­
bility: (A) slurry the dry herbicide(s) in water before 
addition, or (6) add 1/2 of the compatibility agent to the 
fertilizer and the other 1/2 to the emulsifiable concen-

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trate or flowable herbicide before addition to the mixture. 
If still incompatible, do not use the materials mixed in 
the same spray tank. 
Rotational Crops and Perennial Crop Replanting 
To avoid crop injury, observe the following precautions: 1) If 
rotating treated land the year following application, plant only 
corn, unless otherwise stated in this label. 2) If replanting 
perennial crops or if rotating land to crops other than corn, do 
not apply Princep 80W in the year preceding planting these 
crops. 
!:.DU t and Nut Crops 
Apply the spray to the orchard or vineyard floor avoiding con­
tact with fruit, foliage, or stems. Recommended rates are based 
on broadcast treatment. For band applications or spot applica­
tions around trees in fruit or nut plantings, reduce the broad­
cast rate of Princep 80W and water per acre in proportion to the 
area actually sprayed. 
Precautions (All fruit and nut crops); TO avoid crop injury~ 
(1) Apply only to orchards or groves where trees have been 
established 12 months or more unless specified differently. 
(2) Make only 1 application per year. except as noted otherwise. 
(3) Do not use on gravelly. sand. or loamy sand soil. and 
~) Immediately following application. limit overhead sprinkler 
irrigation to 1/2 inch. 
Almonds. Peaches. and Nectarines lCA only) 
Apply 1.25-2.5 lbs. of Princep SOW per treated acre in a 2-4 ft. 
band on each side of the tree row. Apply before weeds emerge in 
late fall or early winter. Weeds controlled by 1.25 Ibs. of 
Princep SOW include burclover, common chickweed, wild mustard, 
and shepherdspurse. Apply only once per year. 
Precautions; To avoid crop injury. 1) Do not treat trees estab­
lished in the grove less than 3 years. 2) Do not treat the 
Mission (TX) variety of almonds. 3) Do not apply to almond 
trees propagated on plum rootstocks. 4) Do not replant almonds. 
peaches. or nectarines in treated soil for 12 months after 
treatment. 5) Do not apply to soil with less than 1% organic 
matter. 6) Do not treat areas where water will accumulate.

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-9-
APples. Pears. and Sour Cherries 
Apply 2.5-5 lbs./A. 
Avocados 
CA and FL only: Apply 2.5-5 lbs./A after final prep. ration of 
grove. 
Bluebenl,es and Caneberries (blackberries. boysenberries. logan­
berries. raspberries) 
Apply 2.5-5 lbs./A in the spring or apply a split application of 
2.5 lbs./A in the spring plus 2.5 lbs./A in the fall. Apply in 
a minimum of 40 gals. of water/A. 
On plantings less than 6 months old, use 1/2 the above rate. 
To control quackgrass, apply 5 lbs./A in the fall or split the 
application applying 2.5 lbs./A in the fall plus 2.5 lbs./A in 
the spring, when quackgrass is actively growing. 
Note: Do not apply when fruit is present, or illegal residues 
may result. 
Cranberries 
MA: Apply up to 5 lbs./A either before spring growth begins or 
in the fall after harvest. 
Other areas: Apply 2.5 lbs./A before spring growth begins. 
Filberts 
Apply 2.5-5 lbs./A in the fall or apply a split application of 
2.5 lbs./A in the fall plus 2.5 lbs./A in the spring. 
Precaution: If trees are planted on a hillside. excessive soil 
erosion may result from the elimination of weeds.

-10-
Note: Do not apply when nuts are on the ground during the har­
vest period, or illegal residues may result. 
Apply 2.5-6 lbs./A any time between harvest and early spring. 
Precaution: Do not use in vineyards established less than 3 
years. or crQP injury may Qccur. 
Grapefruit. Lemons. and Oranges 
AZ (LemQns and Oranges Qnly): Apply a split application of 
2 lbs./A in the spring plus 2 lbs./A in the fall. 
CA (Grapefruit. Lemons. and Oran~: Apply 2.5-5 lbs./A in a 
single application; or apply 2.5 lbs./A in the fall ana 2.5 
lbs./A in the spring. 
Precaution: Do not use in the Imperial. Coachella. or PalQ 
Verde valleys. or crop injury may occur. 
FL (Grapefruit and Oranges only): Apply 5 lbs. of Princep BOW 
to weed-free soil during the spring and/or fall to control weeds 
expected to e~erge during these periods. Apply prior to emer­
gence of weeds or after emerged weeds have been controlled with 
a contact herbicide. Use ca~~ion to keep the treatment off the 
foliage, fruit, or trunk of citrus trees. 
TX (Grapefruit and Oranges only): Apply 5-6 lbs./A. 
Precautions (All areas): To avoid crop injury. 1) po not use in 
nurseries. 2) Do not apply to bedded grapefruit. lemons. or 
oranges (except for FL grapefruit and oranges. 3) Do not apply 
to trees under stress from freeze damage for 1 year aft~r the 
freeze. 4) In FL. do not exceed 10 lbs. of Princep BOW during 
any 1 growing season. 
Macadamia Nuts 
Apply 2.5-5 lbs. in 50 gals. of water/A before harvest and just 
prior to weed emergence. Repeat application as necessary. 
Note: Do not apply when nuts are on the ground during the har­
vest period, as illegal residues may result. 
Olives 
Apply 2.5-5 lbs./A following grove preparation in the fall. Re­
peat annually in midwinter. 
Peaches. Plums. and Sweet Cherries 
Apply 2-5 lbs./A. Apply in late fall to early spring prior to 
weed emer~ence.

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Precautions: To avoid crop injury. 11 Peaches: use only in AR. 
LA. MO. OK. TX. and states east of the Mississippi River. For 
CA. see specific directions in the Almonds. Peaches. and 
Nectarines eCA only) section. 2) Plums and sweet cherries: use 
only in MO and states east of the Mississippi River except TN. 
Pecans 
Apply 2.5-5 lbs./A before weeds emerge in the spring. 
Precautions; To avoid crop injury. 1) DO not use west of the 
Pecos River in IX or in AZ. CA or NM. 2) DO not make applica­
tions to transplanted trees that have been established less than 
2 years in the grove. 
Note: Do not apply when nuts are on the ground, or ille~al 
residues may result. Do not allow animals to graze treated 
areas. 
Strawberries 
OR and WA: For control of chickweed, groundsel, mustard, and 
shepherdspurse, apply broadcast 1.25 lbs./A. In fields where 
overhead irrigation is used to activate this product, apply af­
ter harvest at time of bed renovation. In fields where overhead 
irrigation is not available, apply during early October through 
November. 
Precautions: To avoid crop injury. 1) Make only 1 application 
per growing season. 2) Do not apply within 4 months af~ 
transplanting. 
Walnuts 
Apply 2.5-5 lbs./A. Leveling and furrowing operations after ap­
plications will lessen effectiveness of weed control. 
Note: Do not apply when nuts are on the ground, or illegal 
residues may result. 
Princep BOW + Brqmacil BOW for Grapefruit and Oranges eFL Only) 
Use in grapefruit and oranges in FL for control of balsamapple, 
black nightshade, carpetweed, crabgrass, cudweed, dayweed, 
Florida pusley, horseweed, pepperweed, pigweed, poorjoe, rag­
weed, rattlebox, spanishneedles, and sandbur, and for partial 
control of bermudagrass, bahiagrass, pangolagrass, paragrass, 
and torpedograss. Apply 5 lbs. of Princep BOW plus 3-4 lbs. of 
bromacil BOW/A beneath trees in a minimum of 40 gals. of water/A 
before before or soon after weed growth begins. Use caution to 
keep the spray off the foliage, fruit, or trunk of citrus trees. 
Use the lower rates for light weed infestations or all applica­
tions in bedded citrus areas. Use the higher rates for heavy 
weed infestations only in ridge grown citrus areas. Temporary 
yellowing of citrus leaves may occur following treatment.

.. ' 
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Precautions; To avoid crop injury. 1) Do not use in nurseries. 
or where trees are under stress from freeze damage for 1 year 
after the freeze. 2) Do not vse on soil with less than 1% 
organic matter or on poorly drained soil. 3) Do not treat trees 
planted in irrigatioA furrows. 4) Do not treat diseased trees 
such as those with foot rot. 5) DO not use in groves inter­
planted with other trees or desirable plants. nor in home grape­
fruit or orange plantings. or in areas where roots of other 
valuable plants or trees may extend. 6) Treated areas may be 
planted to citrus trees 1 year after application. 7) Do not 
rotate to other crops within 2 years after application. 
Note: Apply only once per year and avoid contact with foliage 
and fruit with spray or mist, or illegal residues may result. 
Princep SOW + Gramoxonef Extra 
This tank mix is effective in the following fruit and nut crops 
for kill of existing vegetation and for residual control of the 
annual broad1eaf and grass weeds claimed for Princep SOW applied 
alone. This combination is ~lso effective for top kill and sup­
pression of perennial weeds. In FL, this mixture may be applied 
in Spring or Fall to emerged weeds. 
Use this tank mix on these crops; 
almonds (CA only) 
apples 
avocados (CA and FL' On1¥) 
cherries (sour and sweet ) 
filberts 
grapefruit (CA and TX only) 
grapes 
lemons (AZ and CA only) 
macadamia nuts 
olives 
oranges 2 
peaches 3 
pears 
pecans 
p1ums 4 
walnuts 
Apply the Princep SOW rate given under the appropriate crop on 
this label plus 1.5-2.5 qts. Gramoxone Extra* in 50-200 gals. 
(30-50 gals. for pecans) of water/A to the orchard floor avoid­
ing contact with fruit, foliage, or stems. Add a nonionic sur­
factant, such as X-77e, at 0.5 pt. per lOO gals. of spray. 
Apply when weeds are succulent and new growth is 1-6 inches 
tall. For mature woody weeds or difficult to control perennial 
weeds, re-treat or spot treat with Gramoxone Extra if regrowth 
occurs. 
Add Princep SOW to the spray tank first (refer to Mixing 
Instructions section of this label), then add Gramoxone Extra, 
and add the surfactant last. Provide constant agitation during 
mixing and application to keep the mixture in suspension.

-13-
Precautions; To avoid crop injury. 1) Apply the tank mix only 
once per year. 2) Use a shield for young trees or vines. 
Refer to the Princep BOW and Gramoxone Extra labels for further 
directions, specific weeds controlled, and precautions and limi­
tations on each crop. 
lIn avocados in FL, this tank mix also controls balsamapple 
vine, rattail amaranth, and at the higher rate of each herbi­
cide, it suppresses coral vine. 
2In oranges in FL, apply 5 lbs. Princep BOW/A per application 
during spring or fall. Do not exceed 10 lbs. of Princep BOW 
during any 1 growing season. 
3Limited to AR, CA, LA, MO, OK, TX, and states east of the 
Mississippi River. As appropriate, refer to Princep BOW 
sections Almonds. Peaches. and Nectarines ICA only) or Peaches. 
Plums. and Sweet Cherries for rate of Princep BOW and other 
information. 
4Limited to MO and states east of the Mississippi River except 
TN. 
*Based on a product containing 1.5 Ibs. Gramoxone Extra cation 
per gallon. 
Tank Mixture with Roundup® 
This tank mixture is effective in grape vineyards and in the 
following bearing or nonbearing tree crops for control of exist­
ing vegetation and for residual control of the annual broadleaf 
and grass weeds claimed for this product applied alone. This 
combination is also effective for partial control of perennial 
weeds contacted by the spray mixture during application. Use 
this tank mixture on these crops; 
almonds** (CA only) 
apples* 
avocados* (CA and FL onlr) 
cherries (sour and sweet) 
fi1berts** 
grapefruits* (CA,FL, and TX) 
grapes* 
lemons * (AZ and CA) 
macadamia nuts** 
oranges* (AZ,CA,FL and TX) 
peaches*l 
pears* 
pecans** 
plums*2 
walnuts** 
Use the appropriate rate given elsewhere on this label for 
Princep-BOW applied alone to the crop being treated. Add to the 
spray tank 1-5 qts. of Roundup/A depending on weeds present and 
their growth stage. Also add an agriculturally approved non­
ionic surfactant at 0.5% by volume of spray solution. Apply the 
mixture in 10-40 gals. of water/A as a postemergence spray to 
the weeds at the appropriate weed growth stage given on the

-14-
Roundup label. 
Add Princep 80W to the spray tank first, then add Roundup. Pro­
vide constant agitation during mixing and application to keep 
the mixture in suspension. Refer to Application Procedures sec­
tion of this label for further directions. 
Precaution: To avoid crap injury. take extreme care to avoid 
contact of herbicide solution. spray. drift. or mist with foli­
age or green bark of trunk. branches. suckers. fruit. or other 
parts of trees or vines. Observe precautions on both the Prin­
cep and Roundup labels for each crop inVOlved. 
Refer to the labels of both herbicides for further directions, 
specific weeds controlled, precautions, and limitations on each 
crop. 
*A1low a minimum of 14 days between last application and har­
vest. 
**Allow a minimum of 21 days between last application and har-
vest of these crops. 
lLimited to AR, CA, LA, MO, OK, TX, and states east of the 
Mississippi River. For CA, see specific directions in the 
Almonds. Peaches. and Nectarines eeA only) • 
2Plums and sweet cherries: limited to MO and states east of the 
Mississippi River except TN. 
Tank Mixture with Solicaml 
For improved control of such weeds as clover, cutleaf evening 
primrose, dandelion, henbit, horseweed or marestail, lambsquar­
ters, and puncture vine, apply Princep 80W in tank mixture with 
Solicam OF. 
Apply 5 lbs./A of Princep 80W plus 4-5 lbs. of Solicam OF (80% 
active ingredient) in 20-100 gals. of water/A. Use the same 
rates in all coarse-textured soils. Do not apply this combina­
tion more than 2 times per year. Princep 80W + Solicam may be 
applied in tank mixture with Gramoxone Extra or Roundup. 
Refer to the labels of the respective herbicides in the mixtures 
when applying tank mixtures. 
Precautions: 1) Keep Princep + Solicam mixtures from contacting 
foliage. fruits. and stems of citrus trees during spraying. 
2) Do not apply within 12 weeks of citrus harvest.

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Princep SOW + Surflan® 
Use this tank mix in the following crops for preemergence con­
trol of all weeds claimed on both labels: 
almonds 
apples 
avocados 
caneberries 
cherries 
filberts 
grapes 
grapefruit 
lemons 
oranges 
peaches 
pears 
pecans 
plums 
English walnuts 
Apply the Princep SOW rate given under the appropriate crop on 
this label plus 2.67-5.33 lbs. of Surflan 75W or 2-4 qts. of 
Surflan A.S. in 20-40 gals. of water/A. Refer to the Surflan 
75W or Surflan A.S. label for complete tank mix directions. 
Observe all precautions and limitations on the Princep SOW and 
Surflan labels. 
Field and Forage Crops 
Corn 
Nitrogen solutions or complete fluid fertilizers may replace all 
or part of the water as a carrier in the spray. Determine the 
physical compatibility of Princep SOW with fertilizer before 
use. Refer to the General Information section of this label for 
a compatibility test. uO not apply after corn has emerged as 
there is danger of liquid fertilizers causing crop injury. 
Preemergence: Apply before weeds and corn emerge. Use the 
appropriate rate in the table below. 
Preplant: Apply in the spring after plowing at the appropriate 
rate in the table below. Apply before, during, or after final 
seedbed preparation. If soil is tilled or worked after applica­
tion, avoid deep incorporation of Princep SOW. Best results 
will be obtained when Princep SOW is applied within 2 weeks 
before planting. Under dry weather conditions, preplant appli­
cations may give better weed control. If weeds develop, parti­
cularly under relatively dry conditions, a shallow cUltivation 
will generally result in better weed control.

Soil Texture 
Coarse-textured soil: 
Sand, silt, and loam that is 
low in organic -matter 
Medium-textured soil: 
Soil containing a moderate 
amount of clay and organic 
matter 
Fine-textured soil: 
Loam that is high in organic 
matter and clay (including 
dark prairie soils of Corn 
Belt) 
Organic soil: 
Peat, muck, and high-organic 
clay 
-16-
Broadcast Rate Per Acre* 
2.5 Ibs. 
3 Ibs. 
3.75 Ibs. 
5 Ibs. 
*For calculation of band treatment rate, see the General 
Information section. 
To control quackgrass: Apply 3.75-5 Ibs./A in the fall. Plow 
2-3 weeks later, or if erosion is a problem, delay plowing until 
spring. 
Precautions: 1) Do not apply more than 5 Ibs. of Princep __ ~ 
per acre to corn per year. 2) Do not rotate to any crop except 
corn until the following year. or injury may occur. 3) After 
harvest. plow and thoroughly till the soil in fall or spring to 
minimize possible injury to spring-seeded rotational crops. 
regardless of the rate used. 4) If more than 3.75 lbs. of 
Princep 80W/A is used (or eqpiyalent rate in a band). a crop of 
untreated corn should precede the next rotational crop. 5) DO 
not apply Princep 80W preplant inco~orated in corn in the High 
Plains and Intermountain areas of the West (including central 
and western KS. western NE. western OK. and the Panhandle of TX) 
where rainfall is sparse and erratic or where irrigation is re­
qpired. 6) In the High Plains and Intermountain areas of the 
West where rainfall is sparse and erratic or where irrigation is 
required. use Princep 80W to control weeds in corn only when 
corn is to follow corn or when a crop of untreated corn is to 
precede another rotational crop. 7) In western MN and eastern 
parts of the Dakotas. NE. and KS. do not plant soybeans follow

--------- - - -
.. 
-17-
ing corn treated with Princep if more than 2.5 lbs. of Princep 
80w/A (or equivalent rate in a bald) was applied. or injury may 
occur. 8) Injury may occur to soybeans planted in north'-central 
and northwest IA. south-central and southwest MN. northeast NE. 
southeast SP. and other areas the year following application on 
soils having a calcareous surface layer. 9) Po not plant sugar 
beets. tobacco. vegetables (including dry beans). spring-seeded 
small grains. or small-seeded legumes and grasses the year after 
Princep 80W application. or injury may occur. 
Note: Po not graze treated areas, or illegal residues may 
result. 
Tank Mixtures on Corn 
AAtrex®: Use Princep 80W in a preplant or preemergence tank 
mixture with AAtrex Nine-oe, AAtrex 80W, or AAtrex 4L for con­
trol of many annual weeds, including carpetweed, crabgrass, fall 
panicum, foxtail, lambsquarters, morningglory, pigweed, ragweed, 
and velvetleaf. 
Apply at the rates given below. Use the 1:1 ratio for mest 
weeds and the 2:1 ratio for expected heavy infestations of crab­
grass and fall panicum .

-lS-
Broadcast Rate Per Acre 
. 1: 1 Ratio 2:1 Ratio 
Soil Texture Princep SOW AAtrex SOW* Princep SOW AAtrex SOW* 
Sand, 
loamy sand, ~.25 lbs. 1.25 lbs. 1.67 lbs. 0.S3 lb. 
sandy loam 
Loam, silt loam, 
silt, clay loam, 
sandy clay loam, 
silty clay loam, ~.5 lbs. 1.5 lbs. 2 lbs. 1 lb. 
sandy clay, or 
silty clay with 
low organic 
matter 
Loam, silt loam, 
silt, clay loam, 
sandy clay loam, 
silty clay loam, 
sandy clay, or 
silty clay with loS lbs. 1.S lbs. 2.4 lbs. 1.2 lbs. 
medium to high 
organic matter, 
and clay 
(including dark 
prairie soils of 
the Corn Belt) 
*When using AAtrex 4L or AAtrex Nine-O, use equivalent rates. 
One lb. of AAtrex SOW equals 0.8 qt. of AAtrex 4L or 0.9 lb. of 
AAtrex' Nine-O.

-19-
Refer to the AAtrex label for complete directions. Also refer 
to the AAtrex label and the Corn section of this label for pre­
cautions and limitations. 
Eradicane®: Use in a .preplant incorporated tank mixture for 
control of all weeds claimed on both the Princep SOW and Eradi­
cane labels including partial control (suppression) of 
shattercane (wild cane). Fluid fertilizer may replace all or 
part of the water in the spray. Check the physical compatibil­
ity of mixture with fertilizer before use. Refer to the General 
Information section of this label for a compatibility test pro­
cedure. Use a minimum of 20 gals. of spray volume/A. Refer to 
the Eradicane label for incorporation directions. Use the 
higher rate of Princep SOW on fine-textured soil and where heavy 
broadleaf infestations are expected. Use the higher rate of 
Eradicane for heavy nutsedge and bermudagrass infestations. For 
partial control (suppression) of shattercane, broadcast and 
incorporate immediately before planting 1.25-2.5 lbs. of Princep 
SOW plus 7.33 pts. of Eradicane 6.7E (or S pts. Eradicane 
Extra)/A. For control of the other weeds claimed on both 
labels, broadcast and incorporate 1.25-3.75 lbs. of Princep SOW 
plus 4.75-7.33 pts. of Eradicane 6.7E (or 5.33-S pts. of Eradi­
cane Extra)/A. Observe all precautions and limitations on the 
Princep SOW and Eradicane labels. 
Gramoxone Extra: Use in a tank mixture where corn will be 
planted directly in a cover crop, established sod, or previous 
crop residues. This combination controls existing vegetation 
and provides residual control of the annual broadleaf and grass 
weeds listed under General Information. 
Add Princep SOW to the spray tank, mix thoroughly with water, 
and then add Gramoxone Extra and a nonionic surfactant. Provide 
constant agitation during mixing and application to keep the 
mixture in suspension. 
Apply 2.5-3.75 lbs. of Princep SOW plus 1.5-2.5 pts. of Gramox­
one Extra* in 20-60 gals. of water/A as a broadcast spray either 
before or after planting, but before corn emerges. Add a non­
ionic surfactant at the rate of 0.5 pt. per 100 gals. of spray 
volume. 
For further information, see general information, caution and 
warning statements, precautions, and notes on the Princep SOW 
and the Gramoxone Extra labels. 
*Based on a product containing 1.5 lbs. Gramox~ne Extra cation 
per gallon. 
L..- _____________________________ _

-20-
Sutan+®: Use in a preplant incorporated tank mixture for con­
trol of all weeds claimed on both the Princep and Sutan+ labels 
including partial control (suppression) of shattercane (wild 
cane). Fluid fertilizer may replace all or part of the water in 
the spray. Check the physical compatibility of mixture with 
fertilizer before us~. Refer to the General Information section 
of this label for a compatibility test procedure. Use a minimum 
of 20 gals. of spray volume/A. Refer to the Sutan+ label for 
incorporation directions. Use the higher rate of Princep on 
fine-textured soil and where heavy broadleaf infestations are 
expected. For partial control (suppression) of shattercane, 
broadcast and incorporate immediately before planting 1.25-2.5 
lbs. of Princep SOW plus 7.33 pts. of Sutan+ 6.7E/A. For con­
trol of the other weeds claimed on both labels, broadcast and 
incorporate 1.25-3.75 lbs. of Princep SOW plus 4.75 pts. of 
Sutan+ 6.7E/A. Observe all precautions and limitations on the 
Princep SOW and Sutan+ labels. 
Nurseries. Christmas Tree Plantings. Shelterbelts 
Nurseries (see list below) 
Apply 2.5-3.75 lbs. in at least 25 gals. of water/A in fall or 
spring. 
Precaution: To avoid plant injury. do not apply for at least 1 
year after transplanting. 
Christmas Tree Plantinqs and Shelterbelts (see list below) 
Remove weed growth before application. Apply 2.5-5 lbs. in at 
least 25 gals. of water/A after transplanting. Use the same 
rate for annual maintenance applications. 
For quackgrass control apply 5 lbs./A in the fall or apply a 
split application of 2.5 lbs./A in the fall plus 2.5 lbs./A in 
early spring, after quackgrass begins growth. 
Precautions: To avoid tree injury. 1) DO not use Princep SOW on 
seedbeds or cutting beds. 2) In CA. OR. and WA. do not apply to 
Christmas trees or shelterbelts sooner than 1 year after trans­
planting. In other areas. do not apply to Christmas trees or 
shelterbelt transplants less than 2 years of age. 3) Do not use 
until soil is firmly settled around roots. 4) po not apply more 
than once a year. except as directed for qyackgrass control. 
Apply Princep SOW to these species of trees and shrubs, as 
recommended above:

Conifers 
arborvitae 
Austrian pine 
Bishop pine* 
knobcone pine* 
-21-
lodgepole pine (shore pine) 
Monterey pine*-
Mugho pine 
red pine (Norway pine) 
Scotch pine 
white pine 
blue spruce 
Norway spruce 
red spruce 
white spruce 
balsam fir 
Douglas fir 
Fraser fir 
white fir 
hemlock 
juniper 
red cedar 
white cedar 
yew (Taxus spp.) 
Deciduous Trees and 
Woody Ornamentals 
American elm 
Siberian elm 
barberry 
boxelder 
bush honeysuckle 
caragana 
cotoneaster 
dogwood 
eucalyptus 
holly (11ex spp.) 
(max. 4 Ibs. /A) 
honey locust 
Oregon grape (Mahonia spp.) 
Pieris spp. (max. 4 lbs./A) 
red oak 
Russian olive 
oleander* 
palm (2.5 lbs./A)* 
bottle brush* 
carob* 
*For California only 
Pennant® Tank Mix: Princep 80W may be tan~ mixed with Pennant 
Liquid Herbicide to control weeds in containerized, field and 
liner* grown ornamentals and commercial landscapes. See the 
Pennant label for ornamental species, weeds controlled with this 
tank mixture, and for other information. 
*Plants transplanted normally in rows in a nursery or similar 
area for further growth prior to transplanting to final growing 
place. 
~lan Tank Mix: On Christmas tree plantings, use this tank 
mix for preemergence control of weeds listed on this label and 
the Surflan 75W (or Surflan A.S.) label. Use on field grown 
conifer species listed on the labels for each herbicide plus 
grand fir, alpine fir, Engelmann spruce, black spruce, Colorado 
blue sFruce, Coulter pine, giant redwood, and Veitchi fir. 
Broadcast the mixture as a directed spray to the soil surface or 
as an overtop spray using 2.5-5 lbs. of Princep 80W and 
2.67-5.33 Ibs. of Surflan 75W (or 2-4 qts. of Surflan A.S.). 
Apply in sufficient water per acre to uniformly treat the area. 
Follow overtop sprays with sprinkler irrigation to move the 
herbicide from leaf surfaces to the soil. Remove weed growth 
before application. Mix weed residues, prunings, or trash into 
the soil, or remove them before treatment. Soil should be in 
good tilth and free of clods at time of application. Shallow 
cultivation (1-2 inches) after treatment will not reduce weed

-------------------------- --~~--
-22-
control. Observe all precautions and limitations on the Princep 
SOW and Surflan labels. 
~: Length of weed control may be reduced when continuous wet 
soil conditions follow herbicide application. 
Precautions: To avoid plant injury. 1) Do not use on seedbeds 
or on unrooted cuttings. 2) Do not use in greenhouses or other 
enclosed areas. 
Turfgrasses for Sod IF10rida Only) 
St. Augustinegrass. Centipedegrass. andZoysiagrass 
Apply 2.5-5 lbs./A, according to soil texture as indicated 
below. 
Muck 5 lbs. Old within 2 days after 
or peat beds lifting of sod 
New 3-4 days after 
beds sprigging or plugging 
Sandy 2.5 lbs. Old within 2 days after 
soil beds lifting of sod 
New 7-10 days after 
beds sprigging or plugging 
If weeds regrow, apply an additional 2.5 lbs. on muck or peat, 
or 1.25 lbs. on sandy soil. 
Precautions: To avoid crop injury. (1) Do not apply within 30 
days prior to cutting or lifting. (2) po not apply in combina­
tion with surfactants or other spray additives. (3) Use only on 
turfgrass reasonably free of infestations of insects. nematodes. 
and diseases. (4) On newly sprigged turfgrass. temporary slow 
ing of growth may follow application. 
Turfgrass for Fairways. Lawns. Sod Production •. and Similar 
Areas 
*In states other than FL. For use on turfgrass for sod in FL, 
see Turfgrasses for Sod IFlorida only) section.

-23-
Bermudagrass. Centipedegrass. St. Augustinegrass. and 
Zoysiagrass 
Apply Princep aow after September 1 (after October 1 for annual 
bluegrass) before emergence of winter annual weeds. Princep 
will control annual bluegrass, burclover, lawn burweed, common 
and mouseear chickweed, corn speedwell, henbit, hop clover, 
spurweed, and parsley-piert. Princep 80W will also control 
these weeds soon after emergence. For control of summer annual 
weeds listed in the General Information section of this label, 
apply Princep aow in late winter before the weeds emerge. Apply 
in a minimum of 15 gals. of water/A. 
Irrigate with 1/2 inch of water if rainfall does not occur with­
in 10 days after preemergence treatment. 
Where annual bluegrass is the major weed, use 1.25 Ibs. of 
Princep aOW/A (0.5 oz. per 1,000 sl. ft.). Use 1.25-2.5 Ibs./A 
(0.5-1 oz. per 1,000 sq. ft.) for control of other weeds. How­
ever, do not exceed 1.25 Ibs. per acre per treatment on newly 
sprigged turfgrass or on hybrid bermudagrass such as TiflawIl, 
Tifway, and Ormond. 
For control of summer annuals which emerge after the initial 
application, apply an additional 1.25 lbs./A at least 30 days 
after the initial application. but not after June 1. However, 
do not make more than 2 applications per year. 
Precautions: On newly sprigged turfgrass. hybrid bermudagrass. 
nondormant bermudagras,. or nondormant zoysiagrass. temporary 
slowing of growth and yel~~wing may occur following application. 
To avoid turf injury. (1) ~Tse only on turfgrass reasonably free 
of infestations of insects. nematodes. and diseases. (2) Do not 
use on golf greens. (3) Do not use north of NC (except may be 
used in the VA Coastal Plains) or west of Highway 281 in TX and 
OK. (4) Do not use on muck or alkaline soils. (5) Do not apply 
over the rooting area of trees or ornamentals not listed on this 
label. (6) Do not seed or overseed with desirable turfgrass 
within 4 months before or 6 months after treatment. (7) Do~ 
apply this product to newly seeded grasses until they have over­
wintered and have a well-developed rhizome system. (al Do not 
exceed 2.5 Ibs./A within 12 months of seeding grasses. 
Note: Do not graze or feed turf clippings to animals, or ille­
gal residues may result.

-24-
Storage and Disposal 
Store in a dry place. Do not contaminate water, food, or feed 
by storage, disposal. Improper disposal of unused pesticide, 
spray mixture, or r~nse water is a violation of federal law. If 
these wastes cannot be used according to label instructions, 
contact your State Pesticide or Environmental Control Agency, or 
the Hazardous Waste representative at the nearest EPA Regional 
Office for guidance in proper disposal methods. 
Completely empty bag into application equipment. Dispose of 
empty bag in a sanitary landfill, or by incineration, or if 
allowed by state and local authorities, by burning. Stay out of 
smoke from burning bags. 
For minor spills, leaks, etc., follow all precautions indicated 
on this label and clean up immediately. Take special care to 
avoid contamination of equipment and facilities during cleanup 
procedure~ and disposal of wastes. In the event of a major 
spill, fire, or other emergency, call 1-800-888-8372, day or 
night. 
Precautionary Statements 
Hazards to Humans and Domestic Animals 
CAUTION 
Causes eye 
the skin. 
with eyes, 
irritation. Harmful 
Avoid breathing dust 
skin, or clothing. 
if inhaled or absorbed through 
or spray mist. Avoid contact 
First Aid: If in eyes, flush with plenty of water. 
attention if irritation persists. If on skin, wash 
and water. If inhaled, remove victim to fresh air. 
breathing, give artificial respiration, preferably 
mouth-to-mouth; get medical attention. 
Personal Protective Equipment: 
Applicators and other handlers must wear: 
• Long-sleeved shirt and long pants 
• Shoes plus socks 
Get medical 
with soap 
If not 
I

-25-
Follow manufacturer's instructions for cleaning/maintaining PPE. 
If no such instructions for washables, use detergent and hot 
water. Keep and wash PPE separately 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 (WPS) for agricultural pesticides [40 CFR 
l70.240(d) (4-6)], the handler PPE requirements may be reduced or 
modified as specified in the WPS. 
Users should: 
• Wash hands before eating, drinking, chewing gum, using 
tobacco or using the toilet. 
• Remove clothing immediately if pesticide gets inside. Then 
wash thoroughly and put on clean clothing. 
Environmental Hazards 
Do not apply directly to water, to areas where surface water is 
present, or to intertidal areas below the mean high water mark. 
Do not contaminate water by cleaning of equipment or disposal of 
wastes. Simazine is a chemical which can travel (seep or leach) 
through soil and enter ground water which may be used as drink­
ing water. Simazine has been found in ground water as a result 
of its use as a herbicide. Users of this product are advised 
not to apply simazine where the water table (ground water) is 
clo~e to the surface and where the soils are very permeable, 
i.e., well drained soils such as loamy sands. Users are advised 
to consult with their local agricultural agencies to obtain 
information on the location of ground water and the type of soil 
in their area. 
AAtrex®, Dual®, Nine-O®, Pennant®, and Princepe trademarks of 
Ciba-Geigy Corporation 
Compex® trademark of KALO Agricultural Chemicals, Inc. 
Eradicane® and Sutan +® trademarks of Stauffer Chemical Company

-26-
Gramoxone® trademark of Zeneca Ag Products 
Roundup® trademark of Monsanto Company 
Solicam® trademark of Sandoz Ltd. 
Surf lane trademark of DowElanco 
Unite® trademark of Hopkins Agricultural Chemical Company 
X-77® trademark of Chevron Chemical Company 
01993 Ciba-Geigy Corporation 
Ciba Plant Protection 
Ciba-Geigy Corporation 
Greensboro, North Carolina 27419

CGA 6L46L 012 
-27-
Revised 
Revised 
Revised 
Revised 
Revised 
Revised 
Revised 
Revised 
Revised 
Revised 
Revised 
Revised 
Revised 
Revised 
[GANNONC.LABELP]PRN80WF5 - 11/15/93 
January 7, 1981 
November II, 1982 
September 20, 1983 
January 9, 1984 
March 12, 1984 
April 2, 1984 
September 25, 1985 
November I, 1985 
August 21, 1986 
February 3, 1987 
April I, 1987 
October 10, 1989 
September 13, 1990 
January 16, 1992 
November IS, 1993 
(WPS)