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hexakis (Vendex) Chemical Profile 4/85


      CHEMICAL NAME:      Hexakis (2-methyl-2-phenylpropyl)-distannoxane (56)

      TRADE NAME(S):      Vendex (1)

      FORMULATION(S):     Available as a 50% wettable powder water soluble
                          bag and 4 pounds per gallon liquid concentrate
                          (4L).  Vendex 50WP is packaged in 1-lb. water soluble
                          bags.  Vendex 4L is packaged in 1 gal. containers

      TYPE:               Organic tin miticide

      BASIC PRODUCER(S):  Shell Chemical Company
                          Agricultural Chemicals
                          P.O. Box 3871
                          Houston, TX 77001

      STATUS:             General use

      PRINCIPAL USES:  Selective organotin miticide giving long residual
      control of plant feeding mites on deciduous fruits, citrus, grapes,
      almonds, greenhouse crops, and ornamentals (56).

                                 I.  EFFICACY

           Non-volatile and non-systemic so it kills by contact action.  No
      ovicidal activity.  Mites are paralyzed prior to death sometimes
      requiring 2-3 days for them to die.  Gives long lasting control (8a).

                             II.  PHYSICAL PROPERTIES

      MOLECULAR FORMULA:  C60 H78 O Sn2 (62)

      MOLECULAR WEIGHT:   1053 (62)

      PHYSICAL STATE:     Colorless crystalline powder (technical product)

      ODOR:               Mild chemical odor (18f)

      MELTING POINT:      138-139 C (technical product) (62)

      SOLUBILITY:         5 ug/l water at 23 C (technical product) (62)

                          III.  HEALTH HAZARD INFORMATION

      OSHA STANDARD:  None established

      NIOSH RECOMMENDED LIMIT:  None established

      ACGIH RECOMMENDED LIMIT:  None established


           A.  ACUTE TOXICITY

               DERMAL:  LD50 = >2000 mg/kg (rabbit) (62)

               ORAL:    LD50 = 2630 mg tech./kg (rat); 1450 mg/kg (mouse);
                          >1500 mg/kg (dog) (62).


           In feeding trials of less than or equal to 2-yr. duration there was
      no effect of toxicological significance in rats receiving 100 mg/kg
      diet or dogs 30 mg/kg daily (62).


           ADI for man 0.03 mg/kg (62).

                        IV.  ENVIRONMENTAL  CONSIDERATIONS

           Little or no hazard to birds, fish and beneficial insects.
      Biological magnification unlikely.  Nonphytotoxic when used as directed

           LC50 (8-day) for bobwhite quail 5065 mg/kg diet.  The LC50 (48-hr)
      for rainbow trout was 0.27 mg a.i. (as w.p./l).  Oral LD50 > 100 ug/bee
      (62).  It is relatively non-toxic to predacious arthropods including
      Stethorus punctum and Amblyseius finlandicus (62).
           Toxic to fish.  Non-toxic to honeybees (8a).
           The acute oral LD50 of Vendex in mallard ducks and ring-necked
      pheasants is greater than 2000 mg/kg.  Median tolerance limits (TL50)
      after 96-hour exposures to bluegill, fathead minnow and rainbow trout
      were 4.8, 1.9 and 1.7 ppb, respectively (18f).

      Approximate Residual Period:  2-7 days on plant surfaces (1).


           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:  Irritation to skin, eyes or respiratory tract (18f).

           SKIN CONTACT:  Flush with plenty of water.  Treat symptomatically
                          and supportively.  If skin irritation persists see a
                          physician (56).

           INGESTION:     Do not induce vomiting (56).

           EYE CONTACT:   Flush with plenty of water; see a physician.  Treat
                          symptomatically and supportively (56).

                        VI.  FIRE AND EXPLOSION INFORMATION

           To be developed.

                                VII.  COMPATIBILITY

           Generally compatible except with alkaline materials (1).
       Corrosive (8a).

                            VIII.  PROTECTIVE MEASURES

      STORAGE AND HANDLING:  Avoid breathing dust or spray mist (56).

      PROTECTIVE CLOTHING:  Wear protective goggles and gloves during mixing
      and spraying operations (56).

                       IX.  PROCEDURES FOR SPILLS AND LEAKS

                                  (800) 424-9300

                               X.  LITERATURE CITED

       1.  Harding, W.C.  1979.  Pesticide profiles, part one: insecticides
               and miticides.  Univ. Maryland, Coop. Ext. Serv. Bull. 267.
               30 pp.

       8a. Thomson, W. T.  1976.  Agricultural chemicals - book 1:
               insecticides, acaricides, and ovicides.  Revised ed.  Thomson
               Publ., Indianapolis, IN.  232 pp.

      18f. Shell Chemical Company, Agricultural Chemicals.  1982.
               Technical data bulletin:  summary of basic data for
               Vendex miticide.  Houston, TX.

      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.

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