Synonyms: sodium 2,6-bis(4,6-dimethoxypyrimidin-2-yloxy)benzoate (IUPAC)
CAS No.: 125401-75-4
Molecular Weight: 452.35507
Molecular Formula: C19H17N4NaO8
Form White: odourless powder.
M.p. 223–224 °C
V.p. 5.05 × 10-6 mPa (25 °C)
Solubility In water 68.7 g/l (20 °C, distilled water). In methanol 25 g/l (20 °C); in ethyl acetate 6.1 × 10-2 (all in mg/l, 25 °C).
Stability: Decomposes at 223 °C.
Hydrolysis DT50 >1 y (pH 7 and 9, 25 °C), 88 d (pH 4, 25 °C).
Aqueous photolysis DT50 42d in natural water, 499d in distilled water (both 25 °C, 1.53 W/m2, 260–365 nm). pKa 3.35 (20 °C)
A selective, systemic post-emergence herbicide, absorbed by foliage and roots. By inhabiting branched chain amino acid synthesis, bispyribac sodium is used to control grasses, sedges and broad- leaved weeds, especially Echinochloa spp., in direct-seeded rice. Also used to stunt growth of weeds in non -crop situations.
100g/l SC, 200g/l SC, 400g/l SC
20% WP, 25% WP
20% WDG, 40% WDG, 80% WDG
pouch, bottle, drum
Risks and Safety Information
Bispyribac sodium is a Class 9, Environmentally hazardous herbicide
LD50 Oral Acute(male rats) 4111mg/kg, (female rats) 2635mg/kg, Birds LD50 Oral Acute for bobwhite quail >2250mg/kg. LC50 (96 h) Acute for rainbow trout and bluegill sunfish >100 ppm. Animals >95% of dose applied to rats was excreted in urine and faeces within 7d. Plants Following application to foliage and soil at 5-leaf stage of rice plants,