Chemical Identification
Common Name
4-tert-butylphenethyl quinazolin-4-yl ether
Molecular Formula
Molecular Structure
Fenazaquin is a contact acaricide for application to foliage. It is active against eggs and motile forms. Dow AgroSciences recommends that it is applied primarily to control small populations of mites in accordance with local recommendations. It can also be used to control large populations of mites in summer. Fenazaquin has only a short period of bioavailability on the crop and is safe to predatory mites, although Typhlodromus pyri colonies suffer some transient effects.

In field trials, fenazaquin did not damage apples and ornamentals at application rates in excess of those recommended for mite control. Dow AgroSciences recommends the product's use in IPM schemes.

To reduce the possibility of the development of resistance to this product, it is recommended that no more than one application is made to any one crop in any one growing season. In addition, other mitochondrial electron transport inhibitor acaricides should not be applied to the same crop in the same calendar year.
Apples, citrus, cotton, cucumbers, melons, ornamentals, pears, plums, pome fruit, strawberries, tomatoes, vegetables, vines


10-15 g ai/hl


2.5-5 g ai/hl


20 g ai/hl


Emulsifiable concentrate (EC)Suspension concentrate (SC)

Physical Properties
Molecular weight:306.4; Physical form:Colourless crystals. Density:1.16; Melting point:77.5-80 °C; Vapour pressure:3.4 ×10-3 mPa (25 °C); Henry constant:4.74 × 10-3 Pa m3 mol-1 ( calc.); Partition coefficient(n-octanol and water):logP = 5.51; Solubility:In water 0.22 < mg/l (20 °C). In chloroform >500, toluene 500, acetone 400, methanol 50, isopropanol 50, acetonitrile, hexane 33 (all in g/l, 20 °C).; Stability: DT50 of aqueous solution exposed to sunlight 15 d ( pH 7, 25 °C).;
Oral:Acute oral LD50 for male rats 134, female rats 138, male mice 2449, female mice 1480 mg/ kg. Percutaneous:Acute percutaneous LD50 for rabbits >5000 mg/kg. Slightly irritating to eyes; non-irritating to skin. Not a skin sensitiser. Inhalation: LC50 (4 h) for male and female rats 1.9 mg/l air. ADI:( JMPR) 0.01 mg/ kg b.w. [1995] (environmental assessment also performed).
Environmental Profile
Bees: LD50 (contact) 8.18 mg/bee.Birds:Acute oral LD50 for bobwhite quail 1747, mallard ducks >2000 mg/kg. Acute dietary LD50 for bobwhite quail and mallard ducks >5000 ppm.Daphnia: LC50 (48 h) 4.1 mg/l.Fish: LC50 (96 h) for bluegill sunfish 34.1, trout 3.8 mg/l. 

Environmental fate: 
Fate in soil:
Fenazaquin strongly adsorbs to soil particles. Its soil half-life is less than ten weeks. There is a low potential for leaching to groundwater.

Fate in aquatic systems:
Fenazaquin is primarily degraded by photolysis in aqueous systems. It has a photolytic half-life of around two weeks.

Transport Information
Hazard Class:II(Moderately hazardous)

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