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Bispyribac sodium
10%SC 25%WG 20%WP


Biochemistry Branched chain amino acid synthesis (ALS or AHAS) inhibitor.  Mode of action Selective, systemic post-emergence herbicide, absorbed by foliage and roots.  Uses Control of grasses, sedges and broad-leaved weeds, especially Echinochloa spp., in direct-seeded rice, at rates of 15-45 g/ha. Also used to stunt growth of weeds in non-crop situations.  Formulation types SC; water-soluble liquid. 



Oral Acute oral LD50 for male rats 4111, female rats 2635, male and female mice 3524 mg/kg.  Skin and eye Acute percutaneous LD50 for rats >2000 mg/kg. Non-irritating to skin; slightly irritating to eyes (rabbits).  Inhalation LC50 (4 h) for rats >4.48 mg/l.  NOEL (2 y) for male rats 20 mg/kg diet (1.1 mg/kg b.w. daily), female rats 20 mg/kg diet (1.4 mg/kg b.w. daily), male mice 14.1 mg/kg daily, female mice 1.7 mg/kg b.w. daily.  ADI 0.011 mg/kg.  Other Non-mutagenic in the Ames test, and non-teratogenic to rats and rabbits.  Toxicity class WHO (a.i.) III (Table 5) 



Birds Acute oral LD50 for bobwhite quail >2250 mg/kg. Dietary LC50 (5 d) for bobwhite quail and mallard ducks >5620 mg/kg diet.  Fish Acute LC50 (96 h) for rainbow trout and bluegill sunfish >100 ppm.  Daphnia LC50 (48 h) >100 ppm.  Algae EC50 (120 h) for Selenastrum capricornutum 3.4 mg/l, NOEC 0.625 mg/l.  Bees LD50 (oral) >200 mg/bee; LC50 (contact) >7000 mg/l spray.  Worms NOEL (14 d) for Eisenia foetida >1000 mg/kg soil. 



Animals >95% of dose applied to rats was excreted in urine and faeces within 7 d.  Plants Following application to foliage and soil at 5-leaf stage of rice plants, c. 10% of carbon label was distributed between straw and roots at harvest.  Soil/Environment In soil, DT50 <10 d (flooded and upland conditions).


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