oxythioquinox (Morestan) Chemical Profile 4/85
CHEMICAL NAME: 6-methyl-1,3-dithiolo [4,5-b] quinoxalin-2-one (56)
TRADE NAME(S): Morestan (56)
FORMULATION(S): Wettable powder and dust (56)
TYPE: Organic hydrocarbon insecticide-miticide-fungicide
BASIC PRODUCER(S): Mobay Chemical Corp., Agricultural Chemicals Div.
Kansas City, MO 64120
STATUS: General use
PRINCIPAL USES: Residual control of mites, mite eggs, powdery
mildew and pear psylla. Used as a pre-bloom spray on most deciduous
fruits and in both pre- and post-bloom sprays on apples and pears. Also
registered for multiple applications to citrus, vegetable, walnuts, and
ornamentals. Smoke generator used to fumigate in greenhouses (56).
Important Pests Controlled: Mites, pear psylla, white flies and aphids.
Powdery mildew is also controlled (8a).
Active against all stages of mites and against pear psylla.
Protective and eradicative activity against powdery mildew (8a).
II. PHYSICAL PROPERTIES
MOLECULAR FORMULA: C10 H6 N2 O S2 (62)
MOLECULAR WEIGHT: 234.3 (62)
PHYSICAL STATE: Yellow crystals (pure compound) (62)
MELTING POINT: 169.8-170 C (pure compound) (62)
VAPOR PRESSURE: 27 uPa at 20 C (pure compound) (62)
SOLUBILITY: Practically insoluble in water (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 = >500 mg/kg (7 day) (rat) (62)
LD50 = >2000 mg/kg (rat, technical product) (56)
ORAL: LD50 = 2500-3000 mg/kg (rat) (62)
LD50 = about 2500-3000 mg/kg (rat, technical product)
B. SUBACUTE AND CHRONIC TOXICITY:
In 2-yr feeding trials rats receiving 60 mg/kg diet suffered no
ill effect (62).
IV. ENVIRONMENTAL CONSIDERATIONS
Some hazard to birds, fish and beneficial insects. Relatively
nonhazardous to honey bees. Biological magnification unlikely. Injury
reported on Delicious and Winesap apples, also some ornamentals such as
alders and roses (1).
Approximate Residual Period: 30 days on plant surfaces; 2 months on
unexposed surfaces (1).
It is non-toxic to honeybees (62). Toxic to fish (8a).
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.
Incompatible with oils (phytotoxic). In late spring or summer may
be phytotoxic when mixed with most insecticides and fungicides. Check
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.