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Mefluidide (3M). 1985 Herbicide Profile (PMEP).

From Cornell Univerisity's Pesticide Management Education Program (PMEP)


mefluidide (Embark) Herbicide Profile 3/85


      CHEMICAL NAME:      N-[2,4-Dimethyl-5-[[(trifluoromethyl)sulfonyl]amino
                          ]phenyl] acetamide (56)

      TRADE NAME(S):      Embark, Vistar, Mefluidide (56)

      FORMULATION(S):     2-S; Diethanolamine salt of mefluidide; equivalent
                          to 2 pounds of mefluidide per gallon (56).

      TYPE:               Herbicide - growth regulator

      BASIC PRODUCER(S):  3M Company
                          Agricultural Products
                          3M Center
                          St. Paul, MN 55144

      STATUS:             General use

      PRINCIPAL USES:  Embark is registered as a plant growth regulator to
      suppress seedhead formation and to regulate the vegetative growth of
      various turfgrass species and woody ornamentals.
           Vistar is registered as a postemergence herbicide in soybeans for
      the control of seedling and rhizomatous johnsongrass, shattercane,
      volunteer corn, volunteer wheat, and volunteer sorghum.  It is also
      labeled for use in tank mix with Basagran herbicide and as a sequential
      application with Blazer herbicide to control a wide spectrum of grass
      and broadleaf weeds (56).

      APPLICATION METHOD(S):  Mefluidide may be applied foliarly with properly
      calibrated ground equipment to actively growing turf before or after
      mowing.  Ornamental and nonornamental woody plants may be sprayed to
      runoff with a boom sprayer just prior to or following trimming and
      shaping.  Application for the control of weeds in soybeans may be made
      when the crop is in the 2 to 6 trifoliate stage of growth (8b).

                                   I.  EFFICACY

      Important Weeds Controlled:  Johnsongrass, shattercane, volunteer corn
      and volunteer sorghum (8b).
           Rainfall within 8 hours after application may effect results
      adversely.  Supresses the weed growth and often controls it.  Control
      occurs as a twisting and stunting of the plant.  Initial effects may not
      be seen for 10 days.  Poor control will be obtained if weeds are under
      stress at time of application (8b).

                             II.  PHYSICAL PROPERTIES

      MOLECULAR FORMULA:  C11 H13 F3 N2 O3 S (62)

      MOLECULAR WEIGHT:   310.3 (62)

      PHYSICAL STATE:     Colorless crystalline solid (pure compound) (62)

      ODOR:               Odorless (pure compound) (58)

      MELTING POINT:      183-185 C (pure compound) (62)

      VAPOR PRESSURE:     <13 mPa at 25 C (pure compound) (62)

      SOLUBILITY:         180 mg/l water at 23 C (pure compound) (62)

                          III.  HEALTH HAZARD INFORMATION

      OSHA STANDARD:  None established

      NIOSH RECOMMENDED LIMIT:  None established

      ACGIH RECOMMENDED LIMIT:  None established


           A.  ACUTE TOXICITY

               DERMAL:  LD50 = >20,000 mg/kg (rabbit) (Embark PGR) (57a).
                        LD50 = >4000 mg/kg (rabbit) (62).
                          Rabbits primary skin irritation study - no
                        irritation to abraded and nonabraded skin (58).

               ORAL:    LD50 = >1920 mg tech/kg (mice); >4000 mg/kg (rat)

               INHALATION:  Rats 4-hr acute aerosol inhalation LC50 - >8.5
                            mg/liter of air (54).

               EYES:    Mildly irritating to the rabbit eye (62).


           No teratogenic effect was observed in rabbits and no mutagenic
      effect was observed in Salmonella typhimurium (62).
           Dogs 90-day feeding no-effect at 1000 ppm in diet; rats 90-day
      feeding no-effect at 6000 ppm in diet (58).

                        IV.  ENVIRONMENTAL  CONSIDERATIONS

           The acute oral LD50 for mallard ducks is >4640 mg/kg (62).
           The LC50 (5d) for mallard duck and bobwhite quail (observed on the
      8th day) was >10,000 mg/kg diet.  The LC50 (96h) for rainbow trout and
      bluegill is >100 mg/l (62).

      Behavior In or On Soils

      1.   Adsorption and leaching characteristics in basic soil types:
             Mefluidide and/or its breakdown products will leach in soil.
             Organic matter and acidic soil conditions have a retarding effect
             on leaching characteristics.  Adsorption on the soil after short
             (3 hr) contact periods is insignificant.
      2.   Microbial breakdown:  Microbial acion does play a part in
             the breakdown of mefluidide in soil.
      3.   Loss from photodecomposition and/or volatilization:  Mefluidide on
             dry soil surfaces is relatively stable to photodecomposition;
             however, in aqueous solutions mefluidide is susceptible to
             photodecoposition.  Volatilization is considered to be minor.
      4.   Persistence in soils at recommended rates:  The chemical is not
             persistent in soil, and has a half life of 2 days (58).

           Trout 4-day LC50           >1200 ppm
           Bluegill 4-day LC50         1600 ppm
           Ducks 8-day LC50           >1000 ppm in diet
           Quail 8-day LC50           >1000 ppm in diet (58)

           LC50 Rainbow trout = >1000 ppm (Embark PGR) (57a)
           LC50 Bluegill sunfish = >1000 ppm (Embark PGR) (57a)


           The chemical information provided below has been condensed
      from original source documents, primarily from "Recognition and
      Management of Pesticide Poisonings", 3rd ed. by Donald P.  Morgan,
      which have been footnoted.  This information has been provided in
      this form for your convenience and general guidance only.  In
      specific cases, further consultation and reference may be required
      and is recommended.  This information is not intended as a sub-
      stitute for a more exhaustive review of the literature nor for the
      judgement of a physician or other trained professional.

           If poisoning is suspected, do not wait for symptoms to develop.
      Contact a physician, the nearest hospital, or the nearest Poison
      Control Center.

      SYMPTOMS OF POISONING:   Absence of adverse toxicological effects
      precludes description of symptoms of poisoning (58).

           SKIN CONTACT:  Wash thoroughly with soap and water in case of skin
      contact (54).

           EYE CONTACT:   In case of eye contact, immediately flush eyes with
      water for at least 15 minutes and call a physician (54).

                        VI.  FIRE AND EXPLOSION INFORMATION

           Nonflammable - formulation contains water (54).

                                VII.  COMPATIBILITY

           Possible incompatibiities:  Liquid fertilizers which are acidic in
      nature.  Slight corrosion of metallic sprayer parts may occur upon
      prolonged contact (58).
           Tests with spray solutions of Embark PGR on metals such as
      galvanized and stainless steel, zinc, aluminum, copper, yellow brass
      and bronze and on eleven types of granite and marble resulted in no
      staining or corrosion (57a).

                            VIII.  PROTECTIVE MEASURES

      STORAGE AND HANDLING:  Formulation exhibited good stability during
      accelerated aging at 60 C for up to 9 months.  Store formulation at
      temperatures above 4 C.  Avoid inhalation, ingestion, or contact with
      the skin or eyes (58).

                       IX.  PROCEDURES FOR SPILLS AND LEAKS

                                  (800) 424-9300

                               X.  LITERATURE CITED

       8b. Thomson, W.T.  1981.  Agricultural chemicals - book 2:
               herbicides.  Revised ed.  Thomson Publications, Fresno, CA.
               274 pp.

      56.  Farm Chemicals Handbook, 70th ed.  1984.  R. T. Meister, G. L.
               Berg, C. Sine, S. Meister, and J. Poplyk, eds.  Meister
               Publishing Co., Willoughby, OH.

      57a. 3M Company, Agrichemicals.  1978.  Product performance manual:
               Embark 2-S, plant growth regulator.  St. Paul, MN.

      58.  Weed Science Society of America, Herbicide Handbook Committee.
               1983.  Herbicide handbook of the weed science society of
               America, 5th ed.  Weed Science Society of America, Champaign,
               IL.  515 pp.

      62.  The Pesticide Manual:  A World Compendium, 7th ed.  1983.  C.R.
               Worthing, ed.  The British Crop Protection Council, Croydon,
               England.  695 pp.


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