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Common NamePyribenzoxim
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中文通用名嘧啶肟草醚
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IUPACbenzophenone O-[2,6-bis(4,6-dimethoxypyrimidin-2-yloxy)benzoyl]oxime
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CASdiphenylmethanone O-[2,6-bis[(4,6-dimethoxy-2-pyrimidinyl)oxy]benzoyl]oxime
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CAS No.168088-61-7
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Molecular FormulaC32H27N5O8
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Molecular Structure
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Category
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ActivityHerbicide.Pyribenzoxim is a non-competetive inhibitor of ALS and the observed ALS inhibition data for rice and barnyard grass is similar suggesting that the basis for selectivity does not lie at the biochemical site of action. Transient chlorosis has been observed in crops 3-5 days after application but this is rapidly outgrown; it is proposed that the observed crop selectivity is due to rapid metabolism of pyribenzoxim in rice.
Pyribenzoxim has a broad-spectrum of tolerance in grass crops with the exception of maize. It has a wide window of application in rice and controls barnyard grass from the 2 leaf to tillering stage. In field trials, the herbicide has been shown to be safe to both direct-seeded and transplanted rice and also to turf species including Kentucky bluegrass, bentgrass, zoysiagrass and perennial ryegrass.
The product is suitable for mixing with post-emergent ALS inhibitor herbicides and pre-emergence amide, carbamate and dinitroaniline herbicides. Antagonism has been observed in mixtures with certain post-emergence products. Trials in Korea have demonstrated that propanil decreases the whole plant activity of pyribenzoxim in Echinochloa crus-galli by reducing translocation to adjacent tissues. Propanil was applied at 0.5 to 4 kg ai/ha from 1 day before to 5 days post-pyribenzoxim treatment. The extent of translocation of radiolabelled pyribenzoxim out of the leaf was reduced from 11% of the total absorbed 48 hours after treatment with pyribenzoxim alone to 3.5% when propanil was applied to the same leaf. Translocation of radiolabel increased to 15% when propanil was applied to an adjacent leaf. The studies found that translocation within 5 days of treatment is required for pyribenzoxim activity as plants were not completely controlled when the treated leaf was removed before that period. Foliar absorption of pyribenzoxim was not affected by propanil. -
CropUseCropUses:
barley, rice, turf, wheat
30-50 g ai/ha
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PremixQuinclorac+Pyribenzoxim+Pyrazosulfuron-ethyl
Pyribenzoxim+Pyrazosulfuron-ethyl+Cyhalofop-butyl
Pyribenzoxim+Pretilachlor+Cyhalofop-butyl
Pyribenzoxim+pretilachlor
Pyribenzoxim+cyhalofop-butyl
Penoxsulam+Pyribenzoxim
Penoxsulam+Cyhalofop-butyl+Pyribenzoxim
Cyhalofop-butyl+Pyribenzoxim+Bentazone
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Physical PropertiesMolecular weight:609.6; Physical form:White, odourless solid. Melting point:128-130 °C; Vapour pressure:9.9 ×10-1 mPa; Partition coefficient(n-octanol and water):logP = 3.04; Solubility:In water 3.5 ppm (25 °C).;
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ToxicologyOral:Acute oral LD50 for rats and mice >5000 mg/ kg. Percutaneous:Acute percutaneous LD50 for rats >2000 mg/kg. Not an eye irritant, nor a skin sensitiser.
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Environmental ProfileEcotoxicology:
Algae: EC50 (96 h) for algae >100 mg/l.Bees: LD50 (24 h) for honeybees >100 mg/l.Daphnia: LC50 (48 h) >100 mg/l.
Environmental fate:
Soil:Relatively immobile and rapidly degraded in soil. In leaching tests using either sandy loam or silty clay soil, in artificial soil columns, >90% of pyribenzoxim accumulated in the 0-10 cm zone. WATER SOLUBILITY: 3.5 ppm at 25°C -
Transport InformationHazard Class:O (Obsolete as pesticide, not classified)
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