Fosthiazate

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Chemical Identification | General Product Information | Physical & Safety Data

Chemical Identification

Common Name

Fosthiazate

中文通用名

噻唑膦

IUPAC

(RS)-[S-(RS)-sec-butyl O-ethyl 2-oxo-1,3-thiazolidin-3-ylphosphonothioate]
or
(3RS)-3-[(RS)-sec-butylthio(ethoxy)phosphinoyl]-1,3-thiazolidin-2-one

CAS

O-ethyl S-(1-methylpropyl) (2-oxo-3-thiazolidinyl)phosphonothioate

CAS No.

98886-44-3

Molecular Formula

C₉H₁₈NO₃PS₂

Molecular Structure

General Product Information

Category

Nematicides > Organophosphorus nematicides

Activity

Nematicide, insecticide
Fosthiazate is a soil-applied product with contact activity. Although fosthiazate was reported to have systemic activity, a report from the USDA suggests that it does not. It has both nematicidal and nematostatic activity. The product inhibits infestation of crops and nematode development in roots. It is most effective when incorporated into soil before sowing or transplanting. Fosthiazate also controls aphids, thrips and mites.

In field trials, fosthiazate did not damage target crops although some leguminous plants suffered leaf scorch.

Field trials in 1999-2000 in Idaho, US (4^th Int. Cong. Nemat.) compared the efficacy of fosthiazate formulations with Vapam for the control of Columbia root knot nematodes (Meloidogyne chitwoodi) on potatoes. In the first trial, the maximum marketable yield was obtained with separate treatments of Vapam (autumn) and fosthiazate (spring), whereas the second trial produced the best result from a combined spring treatment.

Pot tests (see Korean J. Appl. Entomol., 2002) showed that fosthiazate was highly effective in both pre- and post-plant treatments against Meloidogyne arenaria. Greenhouse studies (Korean J. Appl. Entomol., 2001) confirmed the efficacy of fosthiazate, particularly when applied both pre- and post-plant, for control of the same nematode in vine-grown oriental melons but residue levels exceeded the maximum residue limit.

CropUse

CropUses:
Bananas, beans (dry), carrots, cereals, coffee, cucumber, eggplant (aubergines), flowers, gherkins, Japanese radish, legumes, nuts, peanuts, potatoes, radish, sweet potatoes, tobacco, tomatoes, watermelons, vegetables

2, 000-4, 000 g ai/ha

Premix

Oligosaccharins+Fosthiazate
Emamectin benzoate+Fosthiazate
Diazinon+Fosthiazate
Chltosan+Fosthiazate
Abamectin+Fosthiazate

Physical & Safety Data

Physical Properties

Molecular weight:283.3; Physical form:Pale yellow liquid; ( tech. is a light brown liquid). Density:1.240 (20 °C); Composition:Tech. is 93.0%. Flash point:127.0 °C (Pensky-Martens closed tester); Vapour pressure:5.6 ×10-1 mPa (25 °C); Henry constant:1.76 × 10-5 Pa m3 mol-1; Partition coefficient(n-octanol and water):logP = 1.68; Solubility:In water 9.85 g/l (20 °C). In n-hexane 15.14 g/l (20 °C).; Stability:In water, DT50 3 d ( pH 9, 25 °C).;

Toxicology

Oral:Acute oral LD₅₀ for male rats 73, female rats 57 mg/ kg. Percutaneous:Acute percutaneous LD₅₀ for male rats 2396, female rats 861 mg/kg. Irritating to eyes; not irritating to skin (rabbits). Sensitising to skin (guinea pigs). Inhalation: LC₅₀ (4 h) for male rats 0.832, female rats 0.558 mg/l.

Environmental Profile

Ecotoxicology:
Bees: LD₅₀ (48 h) 0.256 mg/bee.Birds:Acute oral LD₅₀ for ducks 20, quail 10 mg/ kg.Daphnia: EC₅₀ (48 h) 279 mg/l.Fish: LC₅₀ (96 h) for trout 114, bluegill sunfish 171 mg/l.

Environmental fate:
Fate in soil:
The half-life of fosthiazate in soil is dependent on soil type. Field dissipation studies in the US showed that fosthiazate was degraded with a DT₉₀ of 48-92 days and that parent compound and its metabolites do not pose a concern in terms of soil mobility.

Fate in aquatic systems:
The fate of fosthiazate in aqueous systems is dependent on pH.