crop-chem-docs/corpus/epa_ppls/228-279.md

# RIVERDALE DRI-MCPA AMINE

- EPA Reg No: **228-279**
- Registrant: NUFARM AMERICAS, INC.
- Signal word: Danger
- Active ingredients: MCPA, dimethylamine salt (95.5%)
- Label accepted: 2003-06-10
- Source PDF: https://www3.epa.gov/pesticides/chem_search/ppls/000228-00279-20030610.pdf

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UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 
WASHINGTON, D.C. 20460 
Russell F, Sawyer 
Nufarm Americas Inc. 
1333 Burr Ridge Parkway, Suite 125A 
Burr Ridge, IL 60521-0866 
Dear Mr. Sawyer: 
Subject: Label Revisions 
Riverdale MCPP-80 Amine Water Soluble 
EPA Registration Number 228-279 
Your Submission Dated May 7,2003 
OFFICE OF 
PREVENTION, PESTICIDES 
AND TOXIC SUBSTANCES 
The amendment referred to above, submitted in connection with registration 
under the Federal Insecticide, Fungicide and Rodenticide Act (FIFRA), as amended is 
acceptable provided that you: 
1. Make the labeling changes listed below before you release the product for 
shipment bearing the amended labeling: 
a, At the beginning of the list of Personal Protective Equipment (PPE) within the 
Precautionary Statements, add the statements "Some of the materials that are 
chemical-resistant to this product are listed below. If you want more options, 
follow the instructions for category A on an EPA chemical-resistance category 
selection chart," In addition, revise the requirement for "waterproof gloves" to a 
requirement for "chemical-resistant gloves made of any waterproof material such 
as polyethylene or polyvinyl chloride," 
b. Within the list of PPE for early re-entry in the Agricultural Use Requirements 
box, revise the requirement for "waterproof gloves" to a requirement for 
"chemical-resistant gloves made of any waterproof material." 
2. Submit one (1) copy of your final printed labeling before you release the 
product for shipment. A stamped copy of the labeling is enclosed for your records.

-2-
If you have any questions concerning this letter, please contact Mr. James Stone 
at 703-305-7391. 
Enclosure 
Sincerely yours, 
J'-T"'''-' J\. ~t 
Joanne I. Miller 
Product Manager (23) 
Herbicide Branch 
Registration Division (7505C)

RIVERDALE"' 
DRI-MCPA~ AMINE 
For Selective Post emergent Control of Many Broadleaf We.ds Xn Rice, Wheat, 
oats, Barley, Rye, Peas, Flax, Established Grasslands and Non-Crop Areas. 
ACTIVE INGREDIENT: 
Dimethylamine Salt 
INERT INGREDIENTS: 
of 2-Methyl-4-Chlorophenoxyacetic Acid> 
TOTAL 
Isomer Specific AOAC Method, Equivalent to: 
*2 Methyl-4-Chlorophenoxyacetic Acid 
Riverdale is a Registered Trademark of Riverdale - A Nufarm Company 
KEEP OUT OF REACH OF CH:ILDREN 
DANGER PBL:IGRO 
Si uBted no entiende la etiqueta, bu.qua a alguien para que 
Ba la explique a usted en detalle. 
(:If you do not understand label, find someone 
to explain it to you in detail.) 
SEE S:IDB PANEL FOR F:IRST A:ID 
AND ADD:IT:IONAL PRBCA1l'l':IONARY STATEMENTS 
NET CONTENTS LBS. 
95.5% 
4.5% 
100.0% 
78.0% 
~PA REG. NO. 228-279 BPA BST. l28-:IL-l 
MANUFACTURED BY NUFARM AMER:ICAS, :INC., BURR R:IDGB, :ILL:INO:IS 60527-0866 
Revised 5/7/03 
Ia EPA Letter IloJed 
»110m 
UDder thl!i Federal In~ecticide. 
Faudieide~ and Rodenddde Ac! 
sa ameud.ed. (or the pe8ticidt' 
"'~ under EPA Re~. No. 
Otc?l-a:1L 
Changed First Aid Statement per PR 2001-1 via Amendment.

+/t 
Riverdale Dri-MCPA~ Amine Page 2 
Corrosive. 
Harmful if 
eyes or on 
(Side Panels) 
PRECAUTIONARY STATEMENTS 
HAZARDS TO HUMANS AND DOMESTIC ANIMALS 
DANGER - PELIGRO 
Causes irreversible eye damage. May be fatal 
swallowed or inhaled. Avoid breathing dust or 
skin or clothing. 
if absorbed through skin. 
spray mist. Do not get in 
NON-WPS USES: Applicators and other handlers who handle this pesticide for any use NOT 
covered by the Worker Protection Standard (40 CFR Part 170) -- in general, only 
agricultural plant uses are covered by the WPS -- must wear: goggles or face shield, 
protective clothing and rubber gloves. 
WPS USES: Personal Protective Equipment - Applicators and other handlers who handle 
this pesticide for any use covered by the Worker Protection Standard (40 CFR Part 170) -
- in general, agricultural plant uses are covered -- must wear: coveralls over short 
sleeved shirt and short pants, waterproof gloves, chemical-resistant footwear plus 
socks, protective eyewear, chemical resistant headgear for overhead exposure and 
chemical-resistant apron. Discard clothing and other absorbent materials that have been 
drenched or heavily contaminated with this product's concentrate. Do not reuse them. 
Follow manufacturer's instructions for cleaning/maintaining Personal Protective 
Equipment (PPE). If no such instructions for washables, use detergent and hot water. 
Keep and wash PPE separately from other laundry. After each day of use, clothing of 
PPE must not be reused until it has been cleaned. 
Engineering Controls Statements: When handlers use closed cabs, or aircraft in a manner 
that meets the requirements listed in the Worker Protection Standard (WPS for 
agricultural pesticides [40 CFR 170.240(d) (4-6)J, the handler PPE requirements may be 
reduced or modified as specified in the WPS. 
USER SAFETY RECOMMENDATIONS 
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. Remove PPE immediately after handling this 
product. Wash the outside of gloves before removing. As soon as possible, wash 
thoroughly and change into clean clothing. 
FIRST AID STATEMENT 
Have the product container or label with you when calling a poison control center or 
doctor, or going for treatment. 
IF IN EYES: Hold eye open. and rinse slowly and gently with water for 15 to 20 
minutes. Remove contact lenses, if present, after the first 5 minutes, 
then continue rinsing eye. Call a poison control center or doctor for 
treatment advice. 
IF SWALLOWED: Call a poison control center or doctor immediately for treatment advice. 
Have person sip a glass of water if able to swallow. Do not induce 
vomiting unless told to do so by a poison control center or doctor. Do 
not.gj.YE: anything by mouth to an unconscious person. 
IF ON SKIN Tttka off contaminated clothing. Rinse skin immediately with plenty of 
OR CLOTHING: water for 15 to 20 minutes. Call a poison control center or doctor for 
treatment advice.

Riverdale Dri-MCPA~ Amine Page 3 
J:F J:NBALED: 
NOTE TO 
PHYSJ:CJ:AN: 
Move person to fresh air. If person is not breathing, call 911 or an 
ambulance, then give artificial respiration, preferably mouth-to-mouth if 
possible. Call a poison control center or doctor for further treatment 
advice. 
Probable mucosal damage may contraindicate the use of gastric lavage. 
ENVJ:RONMENTAL HAZARDS 
Drift or run-off may adversely affect nontarget plants. Do not apply directly to water, 
or to areas where surface water is present or to intertidal areas below the mean high 
water mark. Do not contaminate water when disposing of equipment washwaters or rinsate, 
nor pour washwaters on the ground; spray or drain over a large area away from wells and 
other water sources. Do not apply this product through any type of irrigation system. 
Do not contaminate domestic or irrigation waters. Spray equipment used in applying this 
product should be thoroughly cleaned before using for any other purpose. Use repeated 
flushing with soap and warm water or suitable chemical cleaner. It is best to use a 
separate sprayer for application of insecticides and fungicides. This product will kill 
or seriouslY injure many desirable forms of vegetation. Do not apply directly to 
flowers, fruits, grapes, tomatoes, ornamentals, cotton or other desirable plants. 
Vapors from this product may injure susceptible plants in the immediate vicinity. Do 
not apply when weather conditions favor drift from target area. Avoid use of small­
diameter nozzles. (Coarse sprays are less likely to drift.) Excessive amounts of this 
product in the soil may temporarily inhibit seed germination and plant growth. 
Most cases of groundwater contamination involving phenoxy herbicides such as MCPA have 
been associated with mixing/loading and disposal sites. Caution should be exercised 
when handling MCPA pesticides at such sites to prevent contamination of groundwater 
supplies. Use of closed systems for mixing and transferring this pesticide will reduce 
the probability of spills. Placement of the mixing/loading equipment on an impervious 
pad to contain spills will help prevent groundwater contamination. 
DlRECTJ:ONS FOR USE 
It is a violation of Federal law to use this product in 
labeling. READ ENTIRE LABEL BEFORE USING THIS PRODUCT. 
ABEL PRECAUTIONARY STATEMENTS AND DIRECTIONS. 
a manner inconsistent with its 
USE STRICTLY IN ACCORDANCE WITH 
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 requirements specific to your State or Tribe, consult the agency responsible for 
pesticide regulation. 
AGRJ:CULTURAL USE REQUJ:REMENTS 
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 workers 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 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 48 hours. 
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 over short-sleeved shirt and short pants, 
waterproof gloves, chemical-resistant footwear plus socks, protective eyewear and 
chemical-resistant headgear for overhead exposure.

Riverdale Dri-MCPA~ Amine Page 4 
NON-AGRICULTURAL USE REQUIREMENTS 
The requirements in 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 allow people (other than applicator) or pets on treatment area during 
application. Do not enter treatment areas until spray has dried. 
GENERAL INFORMATION 
MCPA is effective on a large number of broadleaf weeds and is useful for controlling these 
weeds in certain crops. Several crops, such as flax, rice, oats, and small grains 
underseeded to legumes, are more tolerant of MCPA than they are of 2,4-D. Crop varieties 
vary in response to MCPA, and some may be easily injured. Apply this product only to 
varieties known to be tolerant to MCPA. Injury to crops may occur from this pesticide. 
If you are not prepared to accept some degree of crop injury, do not use this product. If 
you are uncertain concerning tolerant varieties or local use situations that may affect ;I, 
crop tolerance to MCPA, contact your seed company or State Agricultural Extension Service 
for advice. 
Just add one-third of the recommended water to your spray tank. Then add the appropriate 
amount of Dri-MCPA~ Amine into the spray tank. Agitate for five minutes then add the 
other two-thirds water to your spray tank. Once dissolved, Dri-MCPA Amine will make a 
stable water solution. It is non-flammable. 
NOTE: (1) Adding oil, wetting agent or other surfactant to the spray may reduce 
selectivi ty to crops, possibly reSUlting in crop injury. (2) Two "heaping" tablespoonfuls 
equals one ounce of Dri-MCPA Amine. 
EFFECTIVENESS ON WEEDS: Riverdale Dri-MCPAm Amine is effective on a large number of 
broadleaf weeds. On Mustard, Thistle, and White top or Hoary cress, it has superiority 
over 2,4-D. The following are some of the weeds killed: Beggartick, Burcucumber, 
Burdock, Buttercup, Canada thistle, Carpetweed, Catsear, Cocklebur, Croton, Daisy, 
Dandelion, Dock, Dragon head mint, Dwarf nettle, Fat hen, Fennel, Field bindweed, 
Galinsoga, Goatsbeard, Goldenrod, Halbertleaved salt bush, Hempnettle, Hoary cress, 
Honeysuckle, Jimsonweed, Knotweed, Kochia, Larnbsquarter, Marshelder, Mexican poppy, 
Mustard, Narrow leaf plantain, Nutgrass, Pennycress, Pepperweed, Perennial morningglory, 
Pigweed, Plantain, Poison hemlock, Prickly lettuce, Puncturevine, Purslane, Ragweed, Red 
root, Redstem, Shepherdspurse, Sicklepod, Small plantain, Sneezeweed, Sow thistle, Spanish 
needle, Stinging nettle, Stinkweed, Sunflower, Thornapple, Tree-of-heaven, Vetch, White 
top, Whitebrush, wild carrot, Wild gooseberry, Wild jute, Wild marigold, Wild petunia, 
Wild radish, Wild sage, Witchweed, Yellow charlock-mustard, Yellow daisy, Yellow rocket. 
SELECTIVE SPRAYING 
NOTE: When using on grain, grasslands, and pastures - do not forage or graze dairy and 
meat animals on treated areas within seven days of slaughter and/or treatment. Do not 
grow crayfish or catfish in treated rice fields. 
Wheat, Oats, Barley and Rye - Not underseeded with legumea - Apply as a water mix spray by 
ground sprayer or airplane. Use 4-1/2 to 9 ounces per acre for the more susceptible weeds 
after crop has reached the 3 to 4 leaf stage up to boot stage. Use up to 27 ounces per 
acre for less susceptible weeds after crop has tillered and up to early boot stage. Do 
not spray from boot to dough stage. 
Wheat, Oats, Barley and Rye - Underseeded with legumes - Alfalfa, Alsike Birdsfoot, 
Trefoil, Lespedeza, Red and White Clover: For emergency control of serious infestations 
of Mustard, Yellow rocket and other susceptible broadleaf weeds, apply 2 ounces to 4-1/2 
ounces per acre. The 2 ounces to 4-1/2 ounces per acre rate can produce injury to 
legumes. Balance the severity of your weed problem against the possibility of crop 
damage. 
Make application after cereal is well tillered in the 4-1eaf stage (4 to 8 inches tall)

Riverdale Dri-MCPA~ Amine Page 5 
when legumes are 2 to 3 inches tall. Do not spray grain in the boot to dough stage. The 
nurse crop and weeds should provide a protecting canopy which, together with the use of 
low gallonage applied at low pressure, will reduce the risk of damage to the legumes. Do 
not apply to small grains underseeded with Vetch or Sweet clover, which are very 
susceptible. There is a definite risk to other legumes if only thinly protected by a 
canopy. 
When applying to small grains, use a minimum of 20 gallons of water per acre for ground 
application and 1 gallon of total spray per acre for aerial application. 
EMERGENCY CONTROL IN WHEAT - Use 30 ounces per acre for perennial broadleaf weeds. Apply 
when weeds are approaching bud stage, but do not spray grain in the boot to dough stage. 
The 30 ounces per acre application can produce injury to wheat. Balance the severity of 
your weed problem against the possibility of crop damage. Where perennial weeds are 
scattered, spot treatment is suggested to minimize the effect of crop injury. 
WEED CONTROL IN ESTABLISHED ALFALFA: For control of Yellow rocket and other susceptible 
annual weeds such as Pennycress or Fanweed, use 9 ounces per acre of Dri-MCPA Amine. 
Apply in late Fall following frosts when the Alfalfa is dormant. The temperature at the 
·.ime of spraying should be above 40·F. 
CANNING PEAS FOR USE IN THE PACIFIC NORTHWEST ONLY: Use Dri-MCPA Amine at 2 ounces to 7 
ounces per acre. Apply in 2 to 10 gallons of total spray for aerial application and 15 to 
30 gallons of water for ground equipment. Apply to peas after the 3 node stage and before 
the first pea flowering. Use when peas are 4 to 6 inches tall. Do not apply during bloom 
period of crop. To control Canada thistle, use 4-1/2 to 7 ounces per acre. Peas may be 
injured somewhat at the higher rate of application, but if thistle growth is heavy, 
control will more than compensate for injury to peas. Do not spray peas that are stressed 
from lack of moisture or when temperatures are over 90 oF. Do not feed treated vines to 
livestock. Do not graze treated fields. 
RICE FOR USE IN CALIFORNIA ONLY: For early senson broadleaf weed and sedge control in 
rice, apply 9 ounces to 13.5 ounces of Riverdale Dri-MCPAm Amine per acre by air in 2 to 
10 gallons of total spray volume when rice is in the 3 to 4 leaf stage, and with well 
established root systems, usually 18 to 24 days after planting. Applications made during 
hot weather or at the higher dosage range may cause temporary stunting of the rice. For 
maximum effectiveness, the weeds should be exposed at the time of treatment. If 
retreatment is necessary, usually 35 to 65 days after planting, the total amount per acre 
f Dri-MCPA Amine applied in the two applications must not exceed 27 ounces in one season. 
Some rice varieties may be less tolerant to MCPA than others. Consult your Agricultural 
Experiment Station or Extension Service weed specialist for appropriate rates and timing 
of MCPA Spray and on tolerance of rice varieties. 
FLAX: Use 2 ounces to 4-1/2 ounces of Riverdale Dri-MCPA Amine in 5 to 20 gallons of 
water per acre by ground equipment and at least 1 to 5 gallons of water per acre by air. 
Apply only when weeds are up and when flax is 2 to 8 inches high and before it comes into 
bud stage. Treatment after early bud stage may result in severe damage. If Canada 
thistle is present, it may be necessary to go as high as 7 ounces per acre to prevent seed 
head production. Some injury to the flax may result. 
RANGE AND TIMBER LANDS: For control of Whitebrush - Use 20 ounces and sufficient water to 
make 8 gallons of solution per acre. Apply in Spring or Fall under good moisture 
conditions, full leaf, and before blossoms begin to fall. 
GRASSES: Established Lawns, Golf Courses and similar Turf Grasses - Use 9 ounces to 27 
ounces per acre in 10 to 120 gallons of water to give thorough coverage. Use higher rate 
for White top and Canada thistle. On smaller areas, use 2/3 ounces mixed in 1 to 3 
gallons of water and apply uniformly over 1,000 square feet. Do not exceed specified 
application dosages for any area. Avoid applying during excessively dry or hot periods 
unless irrigation (watering) is used before treatment. For best results, do not apply if 
rainfall is expected within 48 hours, nor should lawns be irrigated for 48 hours following 
application. For optimum results, turf should not be mowed for 1 to 2 days before and 
after application. Reseed no sooner than 3 to 4 weeks after application of this product. 
Spring and Fall are best times to treat. Do not use on lawns of creeping grasses, such 
as bent, except for spot spraying, nor on freshly-seeded turf until the grass has become 
well established, usually after the third mowing.

Riverdale Dri-MCPAm Amine Page 6 
Established Grassland and Pastures - Use 9 ounces to 27 ounces per acre in sufficient 
water (2 to 120 gallons) in airplane or ground sprayer application and give thorough 
coverage. Use higher rate for White top, Canada thistle and other hard-to-kill weeds; 
spray perennials in early bud to full bloom stage and regrowth in Fall. Other weeds in 
Spring or Fall. 
Grasses Grown for Seed - Use 9 ounces to 18 ounces per acre in 2 to 120 gallons of water 
by air or ground sprayer application. Use higher rate where weed stands are heavy. In 
established grasses, apply in Spring before head comes into boot stage and on seedling 
grass after grass has tillered. 
NOTE: For weed control in grasses, repeat treatment may be needed for less susceptible 
weeds. White clover and other legumes may be temporarily injured or kill~d. In some 
areas, bent, buffalo, carpet, centipede, dichondra and St. Augustine grasses may also be 
injured by the treatment. 
NON-CROP SPRAYING. Canada thistle, White top and Meadow buttercup - (In Non-Crop Areas 
such as Roadsides, Fence rows, and Rights-of-way): For spot treatment, use 2-1/2 ounces 
to 3 to 4 gallons of water or 5.4 ounces per acre in 12 to 20 gallons of water to give 
coverage for most extensive areas. Spray to wet weeds thoroughly when in bud to early { 
bloom and again on Fall regrowth. No grazing or feeding of forage. 
STORAGE AND DISPOSAL 
STORAGE: Always store pesticides in original container and place in a secured 
warehouse or storage building. This product should be stored in a cool, dry location. 
Containers should be opened in well-ventilated area. Keep container tightly sealed 
when.??~ in use. Do not stack cardboard cases more than two pallets high. Do not 
stor~pen containers of fertilizer, seed or other pesticides. Do not contaminate 
water, food or feed by storage or disposal. 
PESTICIDE DISPOSAL. Pesticide wastes are acutely hazardous. If container is damaged 
or if pesticide has leaked, clean up all spillage. Place in a closed labeled container 
for use or proper disposal. Improper disposal of excess pesticide, spray mixture, or 
rinsate is a violation of Federal law. If these wastes cannot be disposed of by use 
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. 
CONTAINER DISPOSAL: Completely empty plastic drum liner into application equipment and 
dispose of in a sanitary landfill or by incineration, or, if allowed by State and local 
authorities, by burning. If burned, stay out of smoke. Fiber drum may be offered for 
recycling or dispose in same manner as plastic liner. 
This product is sold by weight and not by volume. If it does not appear full when opened, 
it is because contents have settled during shipping and handling. 
WARRANTY 
Nufarm Americas, Inc. warrants that this herbicide conforms to the chemical description on 
its label. When used in accordance with label directions under normal conditions, this 
herbicide is reasonably fit for its intended purposes. Since timing, method of 
application, weather, plant and soil conditions, mixtures with other chemicals, and 
factors affecting the use of this product are beyond our control, no warranty is given 
concerning the use of this product contrary to label directions or under conditions which 
are abnormal or not reasonably foreseeable. The user assumes all risks of any such use. 
(RV 050703)