Name: Pyridaphenthion

Synonyms: 6-Diethoxyphosphinothioyloxy-2-phenylpyridazin-3-one; O-(1,6-Dihydro-6-oxo-1-phenyl-3-pyridazinyl)phosphorothioic acid O,O-diethyl ester

Molecular Formula:C₁₄H₁₇N₂O₄PS

Molecular Weight: 340.33

CAS Registry Number: 119-12-0

EINECS: 204-298-5

Physical & Chemical Properties

Apearance: Colorless to milky white or light Colorless transparent oil-like liquid
Pyridaphenthion Solubility.: In water 100 ppm (20ºC). In acetone 3.77 methanol 2.66 (both in kg/kg, 21 ºC); In diethyl ether 1.01 kg/kg (25ºC)

Mode of Action

Insecticide and acaricide with contact and stomach action.

Toxicity

Acute oral LD50: male rats 769, female rats 850, mice 459, dogs >12000 mg/kg.
Acute percutaneous LD50: male rats 2300, female rat 2100 mg/kg.

Non-irritating to skin (rabbits).

Application

Control of sucking and chewing insects (e.g. stem borers, leaf rollers, leafhoppers, planthoppers, leaf beetles, skippers, grasshoppers, thrips, aphids, sawflies, lace bugs, caterpillars, onion flies, bean seed flies, etc.) and spider mites on paddy rice, vegetables, fruit, and ornamentals. Also effective against Isoptera in public health.