Bispyribac-sodium

Stable in water and under light Bispyribac-sodium is a systemic post-emergence herbicide, used to control a broad range of weeds in rice... 

The residue definition is for the parent, bispyribac-sodium, only... 

Bispyribac-sodium is recovered as the free acid, bispyribac, from plant material and soil by acetonitrile-water (4 1, v/v) solvent extraction. After filtration, the acetoni-tirile is evaporated under reduced pressure. The aqueous residue is dissolved in buffer solution (pH 7.4) and washed with ethyl acetate to separate the impurities from the extract. Then the solution is acidified and extracted with ethyl acetate. The ethyl acetate is evaporated. The residue is methylated with trimethylsilyldiazomethane. 

Bispyribac-sodium, analytical grade (Ihara Chemical Industry Co., Ltd)... 

The residue R, expressed in mg bispyribac-sodium, is calculated from the following equation ... 

Wa = amount of bispyribac-sodium for Vi read from the calibration curve (ng). 

Bispyribac-sodium - Herbicide in Direct-seeded Rice... 

In comparison with the unsubstituted compound (Ri = R2 = H), it was, consequently, revealed that the introduction of substituents into 4 and 6 positions of the pyrimidine was favorable for improving rice safety without decreasing herbicidal activity. In particular, the 4,6-dimethoxy compound, being a bis-pyrimidinyl compound, showed both a remarkable improvement in rice safety and excellent activity against Echinochloa spp. and broad-leave weeds. Finally, the sodium salt of 2,6-bis[(4,6-dimethoxypyrimidin-2-yl)oxy]benzoic acid (14, bispyribac-sodium) was selected to be commercialized as a herbicide on direct-seeded rice [22]. 

Bispyribac-sodium is a post-emergent herbicide for the control of a wide range of weeds with excellent selectivity on direct-seeded Indica-type rice [22, 23]. The low... 

Fig. 2.5.17. Sensitivities of GST-fused ALSs to bispyribac-sodium and chlorsulfuron.

A31 Bispyribac sodium metabolism Herbicide detoxification [191]... 

On the other hand, the ALS of Lactuca setriola possessing a mutation of proline at 171 to histidine has been shown to be resistant to the SU and to exhibit cross-resistance to the IM but not to the PC. The ALS of K. scoparia possessing a mutation of proline at position 171 to serine was inhibited by the PC herbicide, bispyribac-sodium (BS) as potently as the wild-type enzyme but expressed a cross-resistance to the PC herbicide, pyrithiobac-sodium (Fig. 4) (5). 

Transgenic rice plants at 5- to 6-leaf stage were treated with bispyribac-oodium (1 kg a.i /ha). The photograph was taken two months after bispyribac-sodium treatment Plant length of the transgenic rice piant marked by A was 88 cm. 

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