Bispyribac Sodium 10% W/V SC

That's a specific agricultural product formulation. Here is a breakdown of what Bispyribac Sodium 10% W/V SC is, its use, and key details:

Bispyribac Sodium 10% W/V SC Overview

This product is a selective, systemic, post-emergence herbicide primarily used in rice (paddy) cultivation.¹

Key Features and Mode of Action

1. Mode of Action (How it works)

• ALS Inhibitor: Bispyribac Sodium is a systemic herbicide that works by interfering with the production of the enzyme Acetolactate Synthase (ALS) (also known as acetohydroxy acid synthase or AHAS).²

• Plant Growth Disruption: The ALS enzyme is necessary for the biosynthesis of essential branched-chain amino acids (valine, leucine, and isoleucine) in susceptible weeds.³ By inhibiting this, the herbicide stops weed growth, leading to chlorosis (yellowing) and eventual death.⁴

• Systemic: It is absorbed by the weeds' foliage and roots and moves throughout the plant.⁵

2. Application Timing

• It is a Post-Emergence herbicide, meaning it is applied after the weeds have already emerged.⁶

• The optimum time for application is generally when the weeds are in the 2-5 leaf stage.⁷

• It is safe for the rice crop itself.⁸

Recommended Dosage and Application

The specific dosage and application timing can vary slightly depending on the rice type, but general recommendations are:

Application Instructions:

1. Drain the field before application.

2. Mix the requisite quantity of the herbicide with the specified amount of water.⁹

3. Use a flat fan or flood jet nozzle for uniform foliar spray.¹⁰

4. The field should be re-flooded within one day after application, and the water should be maintained for at least ¹¹$5-10$ days to suppress further weed emergence.¹²