Agrochemical Pesticide Fungicide Pyridaben CAS 96489-71-3

Common Name

Pyridaben

 

IUPAC

2-tert-butyl-5-(4-tert-butylbenzylthio)-4-chloropyridazin-3(2H)-one

 

CAS

4-chloro-2-(1,1-dimethylethyl)-5-[[[4-(1,1-dimethylethyl)phenyl]methyl]thio]-3(2H)-pyridazinone

 

CAS No.

96489-71-3

 

Molecular Formula

C₁₉H₂₅ClN₂OS

 

Molecular Structure

 

 

General Product Information

 

 

Category

Insecticides > Unclassified insecticides
Acaricides / Miticides > Unclassified acaricides

 

Activity

Acaricide/Miticide, insecticide.
Pyridaben is a contact acaricide. It is active against motile stages of mites and also controls whiteflies. It has a rapid knockdown effect. Residual activity lasts for 30-40 days after treatment. The product has no plant-systemic or translaminar activity. Pyridaben controls hexythiazox-resistant mites.
Nissan recommends only one application per season to fruit, to avoid the build up of resistance. Field trials suggest that pyridaben has a moderate but transient effect on predatory mites, although this is not as marked as with pyrethroids and organophosphates. Nissan believes that the product is compatible with IPM programmes. Late spring to early summer applications are recommended for the control of mites. In field trials, pyridaben has shown no phytotoxicity at recommended rates. In particular, no russeting of apples has been observed.

 

CropUse

Crop uses: 
Fruit (including vines), vegetables, tea, cotton, ornamentals 
 

Apples: 10-15 g ai/hl	Citrus: 6-16 g ai/hl
Vines: 10-15 g ai/hl	Tea: 10-20 g ai/hl
Vegetables: 7.5-20 g ai/hl	Ornamentals: 7.5-20 g ai/hl

 

Premix

Imidacloprid+pyridaben
Pyridaben+fenpropathrin

 

 

 

 

 

Type	AI concn
Emulsifiable concentrate (EC)	15% (w/v)
	20% (w/v)
Suspension concentrate (SC)	20% (w/v)
	25% (w/v)
Wettable powder (WP)	20% (w/w)
	60% (w/w)
	75% (w/w)

Emulsifiable concentrate, suspension concentrate, wettable powder. Premix Parters: chlorothalonil; imazalil.

 

Physical & Safety Data

 

 

Physical Properties

Molecular weight:364.9. Physical form:Colourless crystals. Density:1.2 (20 °C); Melting point:111-112 °C; Vapour pressure:0.25 mPa (20 °C); Partition coefficient(n-octanol and water):logP = 6.37 (23? °C, distilled water); Solubility:In water 0.012 mg/l (24 °C). In acetone 460, ethanol 57, hexane 10, benzene 110, xylene 390, cyclohexane 320, n-octanol 63 (all in g/l, 20 °C). Stability:Stable at 50 °C for 90 d; unstable to light. Stable to hydrolysis for 30 d in the dark ( pH 5, 7 and 9, 25 °C). Soluble in methylene chloride, relatively soluble in acetonitrile and ethanol.

 

Toxicology

Oral:Acute oral LD₅₀ for male rats 1350, female rats 820, male mice 424, female mice 383 mg/kg. Percutaneous:Acute percutaneous LD₅₀ for rats and rabbits >2000 mg/kg. Non-irritant to eyes and skin (rabbits). Non-sensitising to skin (guinea pigs). Inhalation: LC₅₀ for male rats 0.66, female rats 0.62 mg/l air.

 

Environmental Profile

Ecotoxicology: 
Algae:Does not significantly affect the average specific growth rate of Selenastrum capricornutum.Bees: LD₅₀(oral) 0.55 μg/bee.Birds:Acute oral LD₅₀ for bobwhite quail >2250, mallard ducks >2500 mg/kg.Daphnia:EC₅₀ (48 h) 0.59 μg/l (nominal concentration).Fish:50 (96 h) for rainbow trout 1.1-3.1, bluegill sunfish 1.8-3.3 μg/l; (48 h) for carp 8.3 μg/l.Worms: LC₅₀ (14 d) 38 mg/kg soil. 
Environmental fate: 
Animals:In the rat, goat and hen, an orally administered dose is excreted mainly in the faeces. Metabolism is complex, with at least 30 degradates.Soil:Readily degrades microbiologically in aerobic soils, DT₅₀ <21 d; further degrades to polar products (including soil-bound residues) and CO₂. In natural water, DT₅₀ 10 d (25 °C, in dark). 
WATER SOLUBILITY: 1.2 x 10^-6 g/100 ml at 20°C.

 

Transport Information

Signal Word:CAUTION; Hazard Class:III (Slightly hazardous)