Cadusafos

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Chemical Identification | General Product Information | Physical & Safety Data

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

General Product Information

Category

Nematicides > Organophosphorus nematicides
Insecticides > Organophosphorus insecticides

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 & Safety Data

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. K_oc 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)