tetradifon (Tedion V-18) Chemical Profile 4/85
CHEMICAL NAME: 4-chlorophenyl 2,4,5-trichlorophenyl sulfone (56)
DEC INGRED. CODE:
TRADE NAME(S): Tedion V-18 (56)
FORMULATION(S): Emulsifiable concentrate, wettable powder, smoke
generators. Tedion V-18 emulsifiable concentrate;
7.52% w/v; Tedion V-18 wettable powder 18.8%;
Tedion V-18 smoke generator (56).
TYPE: Organosulfur miticide
BASIC PRODUCER(S): Philips-Duphar B.V.
1077 AR Amsterdam, Holland
020-73 12 26
STATUS: General use EFFICACY
PRINCIPAL USES: Mites on fruit, vegetables, field crops and
ornamentals. Affects larval stages and females. Nonsystemic (1).
Larvicidal and ovicidal activity on spider mites. Used on many species
of fruits (including citrus and nuts), vegetables, cotton, hops, tea,
and ornamentals (56).
Important Pests Controlled: Most species of mites. Laboratory
observation has shown that treated adult female mites deposit eggs that
either fail to develop or are delayed in their normal hatching period.
Effective on all stages of mites except the adults (8a).
Long residual effects although it is not fully systemic. Not
effective against over-wintering eggs. Known to give mite control from
six months to one year on citrus, and thirty to sixty days on deciduous
fruits. Kill of adult mites may be slow and several days may elapse
before the full effect is realized. Insects are not controlled (8a).
II. PHYSICAL PROPERTIES
MOLECULAR FORMULA: C12 H6 Cl4 O2 S (62)
MOLECULAR WEIGHT: 356.0 (62)
PHYSICAL STATE: Off-white to slightly yellow crystalline solid
(technical grade, greater than or equal to 95% pure)
MELTING POINT: Not below 144 C (technical grade) (56); 148-149 C
(pure compound) (62).
VAPOR PRESSURE: 32 nPa at 20 C (technical grade) (62)
SOLUBILITY: Slightly soluble in water (56); 50 uG/l water at 10 C
(technical grade) (62).
III. HEALTH HAZARD INFORMATION
OSHA STANDARD: None established
NIOSH RECOMMENDED LIMIT: None established
ACGIH RECOMMENDED LIMIT: None established
A. ACUTE TOXICITY
DERMAL: LD50 = 10,000 mg/kg (rabbit) (62)
ORAL: LD50 = >14,700 mg/kg (rat) (56)
B. SUBACUTE AND CHRONIC TOXICITY:
In 2-yr feeding trials rats receiving 300 mg a.i./kg diet suffered
no ill-effect; offspring of rats receiving 1000 mg/kg diet were normal
IV. ENVIRONMENTAL CONSIDERATIONS
Little or no hazard to birds, fish and beneficial insects.
Relatively nonhazardous to honey bees. Biological magnification
unlikely. Generally safe on plants (1).
Approximate residual period: 1-3 weeks on plants (1).
LC50 (8-day) for bobwhite quail, Japanese quail, pheasant and mallard
duck was >500 mg/kg diet. LC50 (3-hr) for carp is >10 mg/l (62).
V. EMERGENCY AND FIRST AID PROCEDURES
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
To be developed.
VI. FIRE AND EXPLOSION INFORMATION
To be developed.
Compatible with most insecticides and fungicides (1). Non-corrosive
VIII. PROTECTIVE MEASURES
To be developed.
IX. PROCEDURES FOR SPILLS AND LEAKS
IN CASE OF EMERGENCY, CALL, DAY OR NIGHT
PESTICIDE TEAM SAFETY NETWORK/CHEMTREC
X. LITERATURE CITED
1. Harding, W.C. 1979. Pesticide profiles, part one: insecticides
and miticides. Univ. Maryland, Coop. Ext. Serv. Bull. 267.
8a. Thomson, W. T. 1976. Agricultural chemicals - book 1:
insecticides, acaricides, and ovicides. Revised ed. Thomson
Publ., Indianapolis, IN. 232 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.
62. The Pesticide Manual: A World Compendium, 7th ed. 1983. C.R.
Worthing, ed. The British Crop Protection Council, Croydon,
England. 695 pp.