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Pesticides >> Insecticides >> Pyridaben


Pyridaben 95%TC
Pyridaben 20%WP
Pyridaben 10%EC

Insecticide, acaricide


Common name pyridaben (BSI, draft E-ISO)
IUPAC name 2-tert-butyl-5-(4-tert-butylbenzylthio)-4-chloropyridazin-3(2H)-one
Chemical Abstracts name 4-chloro-2-(1,1-dimethylethyl)-5-[[[4-(1,1-dimethylethyl)phenyl]methyl]thio]-3(2H)-pyridazinone
CAS RN [96489-71-3] Development codes NC-129; NCI-129 (both Nissan); BAS-300I (BASF)

Biochemistry Inhibitor of mitochondrial electron transport at complex I Mode of action Non-systemic insecticide and acaricide. Rapid knockdown and long residual activity. Active against all developing stages, especially against the larval and nymph stages. Uses Control of Acari, Aleyrodidae, Aphididae, Cicadellidae and Thysanoptera on field crops, fruit trees, ornamentals and vegetables, at 5-20 g/hl or 100-300 kg/ha. Formulation types EC; SC; WP. Selected tradenames: 'Sanmite' (Nissan)

'Nexter' (Nissan); 'Dinomite' (Vapco); 'Pyramite' (Nissan, BASF); 'Samite' (Sanonda) Discontinued names: 'Poseidon' * (Nissan); 'Starling' * (Nissan, Zeneca)

Details from Nissan.

Oral Acute oral LD50 for male rats 1350, female rats 820, male mice 424, female mice 383 mg/kg. Skin and eye 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. NOEL (78 w) for mice 0.81 mg/kg daily; (52 w) for dogs 0.5 mg/kg daily. Other Non-mutagenic in Ames, DNA repair, in vitro chromosomal (Chinese hamster), and mouse micronucleus tests; non-teratogenic in rats and rabbits. Toxicity class WHO (a.i.) III (20 WP); EPA (formulation) I (75 WP)

Birds Acute oral LD50 for bobwhite quail >2250, mallard ducks >2500 mg/kg. Fish LC50 (96 h) for rainbow trout 1.1-3.1, bluegill sunfish 1.8-3.3 mg/l; (48 h) for carp 8.3 mg/l. Daphnia EC50 (48 h) 0.59 mg/l (nominal concentration). Algae Does not significantly affect the average specific growth rate of Selenastrum capricornutum. Bees LD50 (oral) 0.55 mg/bee. Worms LC50 (14 d) 38 mg/kg soil.

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. Plants After application to citrus and apple, pyridaben degrades gradually photochemically and is not translocated into the pulp. Soil/Environment 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). DT50 for aqueous photolysis c. 30 min (pH 7). See also Stability.


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