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Chemical Identification
Common Name
Cadusafos
中文通用名
硫线磷
IUPAC
S,S-di-sec-butyl O-ethyl phosphorodithioate
CAS
O-ethyl S,S-bis(1-methylpropyl) phosphorodithioate
CAS No.
95465-99-9
Molecular Formula
C10H23O2PS2
Molecular Structure
Category
Activity
Insecticide.
Cadusafos is a contact and stomach insecticide/nematicide. It is applied to the soil: either to the furrow at the time of planting, or to the soil surface. It is not absorbed by roots, but has been shown to enhance root development. The product is not systemic, but low soil mobility ensures that the product is in contact with the root system for a protracted period after application.

In field trials, cadusafos gave equal or better control of nematodes and wireworms than standard insecticides/nematicides, sometimes at lower use rates.
CropUse
Crop uses:
bananas, citrus, coffee, fruits, maize, peanuts, potatoes, soybeans, sugar beets, sugar cane, tobacco, vegetables, vines, watermelons

Maize

750-2,000 g ai/ha

Soybeans

1,000-2,000 g ai/ha

Sugar cane

2,000-4,000 g ai/ha

Vines

5-15 g ai/ha

Bananas

2-3 g ai/plant per application

Peanuts

1,000-2,000 g ai/ha

Vegetables

2,000-9,000 g ai/ha

Tobacco

3,000-6,000 g ai/ha

Physical Properties
Molecular weight:270.4; Physical form:Colourless to yellow liquid. Density:1.054 (20 °C); Flash point:129.4 °C (Seta closed cup); Vapour pressure:1.2 ×102 mPa (25 °C); Partition coefficient(n-octanol and water):logP = 3.9; Solubility:In water 248 mg/l. Completely miscible with acetone, acetonitrile, dichloromethane, ethyl acetate, toluene, methanol, isopropanol, and heptane.; Stability:Stable up to 50 °C. Half-life in light <115 d.
Toxicology
Oral:Acute oral LD50 for rats 37.1, mice 71.4 mg/kg. Percutaneous:Acute percutaneous LD50 for male rabbits 24.4, female rabbits 41.8 mg/kg. Non-irritating to skin and practically non-irritating to eyes of rabbits. Inhalation:LC50 (4 h) for rats 0.026 mg/l air.?
Environmental Profile
Ecotoxicology: Algae:EC50 (96 h) 5.3 mg/l.Birds:Acute oral LD50 for bobwhite quail 16, mallard ducks 230 mg/kg.Daphnia:LC50(48 h) 1.6 mg/l.Fish:LC50(96 h) for rainbow trout 0.13, bluegill sunfish 0.17 mg/l.Worms:LC50(14 d) for Eisenia foetida 72 mg/kg. Environmental fate: Animals:Readily absorbed, metabolised and eliminated in urine and faeces. Hydroxy sulfones were the major metabolites, followed by phosphorothioic and sulfonic acids.Soil:DT50 in silty clay, sandy loam soils 11-55 d. Koc 144-351.

Mallard duck

LD50 230 mg/kg

Bobwhite quail

LD50 16.4 mg/kg

Rainbow trout [96 h]

LC50 130 μg/L

Fate in soil:
Cadusafos is slightly mobile in sandy soils. Its soil half-life is approximately 6-7 weeks. The product does not bioaccumulate from season to season.

Fate in aquatic systems:
Cadusafos undergoes hydrolysis at pH 5. Its half-life in water is 4-5 weeks.


WATER SOLUBILITY: 248 ppm?
SOIL PARTICLE ADSORPTION: Half-life of 45 days in silty clay, sandy loam soils.
Transport Information
Signal Word:WARNING; Hazard Class:Ib (Highly hazardous)

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