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Acetamiprid Cartap
Etofenprox Imazethapyr
Metalaxyl-M Nicosulfuron
Thiamethoxam Clopyralid
Emamectin Benzoate Fenoxaprop-p-ethyl
Bacillus Thuringiensis Metsulfuron
Penconazole Abamectin
Tebuconazole Tribenuron
Kresoxim-methyl Bispyribac-Sodium

Pesticides >> Insecticides >> Deltamethrin


Deltamethrin 98%TC
Deltamethrin 5%EC
Deltamethrin 2.5%EC



Common name deltamethrin (BSI, draft E-ISO); deltamethrine ((f) draft F-ISO)
IUPAC name (S)-a-cyano-3-phenoxybenzyl (1R,3R)-3-(2,2-dibromovinyl)-2,2-dimethylcyclopropanecarboxylate
Roth: (S)-a-cyano-3-phenoxybenzyl (1R)-cis-3-(2,2-dibromovinyl)-2,2-dimethylcyclopropanecarboxylate
Chemical Abstracts name [1R-[1a(S*),3a]]-cyano(3-phenoxyphenyl)methyl 3-(2,2-dibromoethenyl)-2,2-dimethylcyclopropanecarboxylate
Other names decamethrin* (rejected common name proposal) CAS RN [52918-63-5]; [52820-00-5] ((RS)- (1R)-cis- isomer pair) EEC no. 258-256-6 Development codes NRDC 161; RU 22 974 (Roussel Uclaf); AE F032640 (AgrEvo) Official codes OMS 1998

Biochemistry Like all pyrethroids, prevents the sodium channels from functioning, so that no transmission of nerve impulses can take place. Mode of action Non-systemic insecticide with contact and stomach action. Fast-acting. Uses A potent insecticide, effective by contact and ingestion against a wide range of pests. Crop protection uses include: Coleoptera (2.5-7.5 g/ha), Heteroptera (5.0-7.5 g/ha), Homoptera (6.2-12.5 g/ha), Lepidoptera (5.0-21 g/ha) and Thysanoptera (5-10 g/ha) in cereals, citrus, cotton, grapes, maize, oilseed rape, soya beans, top fruit and vegetables. It controls Acrididae (5.0-12.5 g/ha), and is recommended against locusts. Soil surface sprays (2.5-5.0 g/ha) control Noctuidae. It is used against indoor crawling and flying insects (12.5 mg/m2) and pests of stored grain (0.25-0.5 g/t) and timber (Blattodea, Culicidae, Muscidae). Dip or spray (12.5-75 mg/l), and pour-on (0.75 mg/kg b.w.) applications give good control of Muscidae, Tabanidae, Ixodidae and other Acari on cattle, sheep and pigs, etc. Formulation types DP; EC; EG; EW; GR; HN; PO; SC; SL; TB; UL; WG; WP. Selected tradenames: 'Decis' (crop protection uses) (Aventis); 'Kordon' (environmental health uses) (Aventis); 'K-Othrine' (environmental health uses) (Aventis); 'Butox' (veterinary uses) (Intervet); 'Delta' (Nagarjuna Agrichem); 'Deltamix' (Agrimix); 'Sadethrin' (Sanonda)

'Bitam' (crop protection uses) (Aventis); 'Cislin' (environmental health uses) (Aventis); 'Decistab' (Aventis); 'Delsekte' (environmental health uses) (Aventis); 'K-Otek' (environmental health uses) (Aventis); 'Pearl Micro' (Aventis); 'Tess' (crop protection uses) (Aventis); 'Delete' (Vapco); 'Deltarin' (Vapco); 'Deltarocca' (Rocca); 'Flayethrin' (Agrochem); 'Keshet' (Makhteshim-Agan); 'Terminator' (Vapco); 'Thripstick' (Aquaspersions); 'Thrust' (Crop Health) mixtures: 'Adage' (+ pirimicarb) (Aventis); 'Akaridecis' (+ propargite) (Aventis); 'Best' (+ pirimicarb) (Aventis); 'Crackdown' (+ bioallethrin S-cyclopentenyl isomer) (environmental health uses) (Aventis); 'Dadeci' (+ buprofezin) (Aventis); 'Decis D' (+ dimethoate) (Aventis); 'Decisdan' (+ endosulfan) (Aventis); 'Decisprime' (+ chlorpyrifos-methyl) (Aventis); 'Decisquick' (+ heptenophos) (Aventis); 'Deltaphos' (+ triazophos) (Aventis); 'Evidence' (+ pirimicarb) (Aventis); 'K-obiol' (+ piperonyl butoxide) (Aventis); 'Patriot' (+ pirimicarb) (Aventis); 'Mieling' (+ phoxim) (Zhong-Xi) Discontinued names: 'Landgold Deltaland' * (Landgold); 'Sputop' * (Coopers)

Product analysis by lc with u.v. detection (AOAC Methods, 1995, 991.03, 7.5.05) or by hplc (CIPAC Handbook, 1988, D, 57; M. Vaysse et al., Anal. Methods Pestic. Plant Growth Regul., 1984, 13, 53). Residues determined by glc with ECD (Man. Pestic. Residue Anal., 1987, I, 6, S19; Anal. Methods Residues Pestic., 1988, Part I, M11; A. Ambrus et al., J. Assoc. Off. Anal. Chem., 1981, 64, 733; P. G. Baker & P. Bottomley, Analyst (London), 1982, 107, 206; P. Bottomley & P. G. Baker, ibid., 1984, 109, 85).

Reviews See A. J. Gray & D. M. Soderlund, Chapt. 5 in "Insecticides". FAO/WHO 89, 91 (see part 2 of the Bibliography). IARC ref. 53 class 3 Oral Acute oral LD50 for rats ranges from 135->5000 mg/kg, depending upon carrier and conditions of the study; for dogs >300 mg/kg. Acute oral LD50 for formulations in rats: >2000 mg (of 15 g/l EC)/kg; 445 mg (of 25 g/l EC)/kg; >5000 mg (of 5 g/l UL)/kg; >16 000 mg (of 25 g/kg WP)/kg; >40 000 mg (of 25 g/l SC)/kg. Skin and eye Acute percutaneous LD50 for rats and rabbits >2000 mg/kg. Non-irritating to skin; mild eye irritant (rabbits). Inhalation LC50 (4 h) for rats 2.2 mg/l air; (1 h) >4.6 mg/l air (micronised). NOEL (2 y) for mice 12, rats 1, dogs 1 mg/kg b.w. ADI (JMPR) 0.01 mg/kg b.w. [2000]. Other Non-mutagenic and non-teratogenic (mice, rats, rabbits). Toxicity class WHO (a.i.) II; EPA (formulation) II

Birds Acute oral LD50 for mallard ducks >4640 mg/kg. Dietary LC50 (8 d) for mallard ducks >8039, quail >5620 mg/kg diet. NOEL for reproduction for mallard ducks >70, bobwhite quail >55 mg/kg daily. Fish Toxic to fish under laboratory conditions; LC50 (96 h) for rainbow trout 0.91, bluegill sunfish 1.4 mg/l. Not toxic to fish under natural conditions. Daphnia LC50 (48 h) 3.5 mg/l. Algae EC50 (96 h) for algae (Selenastrum capricornutum) >9.1 mg/l. Low LD50 and LC50 values under laboratory conditions do not represent a significant hazard to aquatic fauna in normal field use. Bees Toxic to bees, LD50 (oral) 79 ng/bee; (contact) 51 ng/bee. Low LD50 and LC50 values under laboratory conditions do not represent a significant hazard to bees in normal field use. Worms LC50 (14 d) for earthworms >1290 mg/kg soil.

EHC 97 (WHO, 1990). Animals In rats, following oral administration, elimination occurs within 2-4 days. The phenyl ring is hydroxylated, the ester bond hydrolysed, and the acid moiety is eliminated as the glucuronide and glycine conjugates. Plants No uptake through leaves and roots - non-systemic compound. No major metabolites, except in oily crops, where trans-deltamethrin is part of the residue definition. Soil/Environment In soil, undergoes microbial degradation within 1-2 weeks. Kd 3790-30 000, Koc 4.6 ´ 105-1.63 ´ 107 cm3/g, confirms strong adsorption by soil colloids and no risk of leaching. DT50 (lab., aerobic) 21-25 d, (anaerobic) 31-36 d. In field, DT50 <23 d. Soil photolysis DT50 9 d. No incidence on soil microflora and nitrogen cycle.

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