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Pesticides >> Insecticide >> Tebufenozide

Tebufenozide 20%SC

Insecticide
diacylhydrazine

Tebufenozide

NOMENCLATURE
Common name tebufenozide (BSI, pa E-ISO, ANSI)
IUPAC name N-tert-butyl-N'-(4-ethylbenzoyl)-3,5-dimethylbenzohydrazide
Chemical Abstracts name 3,5-dimethylbenzoic acid 1-(1,1-dimethylethyl)-2-(4-ethylbenzoyl)hydrazide
CAS RN [112410-23-8] Development codes RH-5992; RH-75922 (both Rohm & Haas)

APPLICATIONS
Biochemistry Ecdysone agonist which acts by binding to the receptor site of the insect moulting hormone, ecdysone. Mode of action Lethally accelerates moulting process. Uses Control of lepidopteran larvae on rice, fruit, row crops, nut crops, vegetables, vines, and forestry, generally at 0.06-0.3 lb/a. Formulation types DP; GR; SC; SU; WP. Selected tradenames: 'Confirm' (Rohm & Haas); 'Mimic' (forestry) (Rohm & Haas); mixtures: 'Conidan' (+ imidacloprid) (Korea) (Bayer)

OTHER TRADENAMES
'Romdan' (Rohm & Haas, Nihon Nohyaku)

ANALYSIS
Details from Rohm & Haas.

Tebufenozide: MAMMALIAN TOXICOLOGY
Reviews FAO/WHO 77, 79 (see part 2 of the Bibliography). Oral Acute oral LD50 for rats and mice >5000 mg/kg. Skin and eye Acute percutaneous LD50 for rats >5000 mg/kg. Non-irritating to eyes and skin (rabbits). Not a skin sensitiser (guinea pigs). Inhalation LC50 (4 h) for male rats >4.3, female rats >4.5 mg/l. NOEL (24 mo) for rats 5.5 mg/kg b.w. daily; (18 mo) for mice 8.1 mg/kg b.w. daily; (12 mo) for dogs 1.9 mg/kg b.w. daily. ADI (JMPR) 0.02 mg/kg b.w. [1996]. Other Negative in the Ames test, reverse mutation assay, mammalian point mutation (CHO), in vivo and in vitro cytogenetic assay, and in vitro unscheduled DNA synthesis test. Toxicity class EPA (formulation) III (2 SC)

Tebufenozide: ECOTOXICOLOGY
Birds Acute oral LD50 for quail >2150 mg/kg. Dietary LC50 (8 d) for mallard ducks and quail >5000 mg/kg. Fish LC50 (96 h) for rainbow trout 5.7, bluegill sunfish 3.0 mg/l. Daphnia LC50 (48 h) 3.8 mg/l. Algae EC50 (120 h) for Selenastrum >0.64 mg/l; (96 h) for Scenedesmus 0.23 mg/l. Other aquatic spp. LC50 (96 h) for mysid shrimp (Mysidopsis bahia) 1.4, Eastern oyster (Crassostrea virginica) 0.64 mg/l. Bees LD50 (96 h, contact) for honeybees >234 mg/bee. Worms LC50 for earthworms >1000 mg/kg. Other beneficial spp. Safe to predatory mites, wasps and other beneficial species.

Tebufenozide: ENVIRONMENTAL FATE
Animals In the rat, 16 whole-molecule metabolites are formed as a result of oxidation of the alkyl substituents of the aromatic rings, primarily at the benzylic positions. Plants In apples, grapes, rice and sugar beet, the major component is unchanged tebufenozide. Metabolites which are detected in small amounts result from oxidation of the alkyl substituents of the aromatic ring, primarily at the benzylic positions. Soil/Environment Metabolic DT50 in soil 7-66 d (7 soil types); for aerobic, aquatic soil 100 d (25 ºC, 3 soil types); for anaerobic, aquatic metabolism 179 d (25 ºC, silt loam). DT50 for field dissipation 4-53 d (12 sites). Koc 351-894. Field dissipation studies indicate no mobility below 30 cm.

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