dichlone (Phygon, Quintar) Chemical Profile 2/85
CHEMICAL NAME: 2,3-dichloro-1,4-napthoquinone (56)
TRADE NAME(S): Quintar, Phygon (56)
FORMULATION(S): Dichlone 50% wettable powder fungicide, dichlone-
sulfur 1.5-30 dust (56).
TYPE: Napthoquinone fungicide
BASIC PRODUCER(S): Hopkins Agricultural Chemical Co.
P.O. Box 7532
Madison, WI 53707
STATUS: General use
PRINCIPAL USES: Used on fruit, vegetable, and field crops;
ornamentals; resident/commercial outdoor areas. Especially effective
for brown rot of stone fruit and scab on apples and pears, as well as
blossom blights (56). Also used in ponds to control blue algae (48).
Especially effective for brown rot of stone fruit and scab on
apples and pears, as well as blossom blights (56).
II. PHYSICAL PROPERTIES
MOLECULAR FORMULA: C10 H4 Cl2 O2 (49)
MOLECULAR WEIGHT: 227 (49)
PHYSICAL STATE: Yellow crystals (pure compound) (49)
MELTING POINT: 193 C (pure compound); not below 188 C (technical
SOLUBILITY: 0.1 ppm in water at 25 C (pure compound) (49)
III. HEALTH HAZARD INFORMATION
OSHA STANDARD: NA
NIOSH RECOMMENDED LIMIT: NA
ACGIH RECOMMENDED LIMIT: NA
A. ACUTE TOXICITY
DERMAL: LD50 = 5000 mg/kg (rabbit) (56)
A skin irritant under warm conditions (49).
ORAL: LD50 = 1300 mg/kg (rat) (56)
B. SUBACUTE AND CHRONIC TOXICITY:
Rats fed for two years on a diet containing 1,500 ppm suffered no
ill effects (49).
IV. ENVIRONMENTAL CONSIDERATIONS
Toxic to fish. Nonhazardous to honey bees. Nonphytotoxic when
used as directed (48).
As Daphnia magna are immobilized at an LC50 of 0.014 ppm, its use
as an algicide at 0.15 ppm may create a food chain hazard to microfauna
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
INGESTION: Get medical attention for ingestion. Small doses
give activated charcoal. Large doses, gastric lavage may be indicated
VI. FIRE AND EXPLOSION INFORMATION
To be developed.
Do not mix with oils, Bordeaux or lime sulfur (48). Compatible
with most common fungicides and wettable powder insecticides. Do not
use sprays containing lime, calcium arsenate, mercury or dinitro
compounds, oil or emulsifiable concentrates (56).
VIII. PROTECTIVE MEASURES
STORAGE AND HANDLING: Avoid contact with skin. May cause skin
and eye irritation. Avoid breathing dust or spray mist (56).
PROTECTIVE CLOTHING: Wear protective clothing. Glycerol or silicone
base protective skin creams are recommended to be used. Lanolin,
vaseline, or oil-based creams should not be used (56).
IX. PROCEDURES FOR SPILLS AND LEAKS
IN CASE OF EMERGENCY, CALL, DAY OR NIGHT
PESTICIDE TEAM SAFETY NETWORK/CHEMTREC
X. LITERATURE CITED
48. Harding, W.C. 1979-80. Pesticide profiles, part two: fungicides
and nematicides. Univ. Maryland, Coop. Ext. Service Bull.
283, 22 pp
49. Pesticide Manual, 4th ed. 1974. H. Martin and C. R. Worthing,
eds. British Crop Protection Council, England. 565 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.