Pyrazosulfuron-ethyl

Pyrazosulfuron-ethyl is a highly effective active ingredient belonging to the sulfonylurea chemical class. It serves as a potent systemic herbicide primarily used for weed control in rice cultivation. By selectively targeting weeds while remaining safe for the rice crop, it has become a staple in modern paddy field management programs.

The mechanism of action involves the inhibition of the acetolactate synthase (ALS) enzyme, which is crucial for the biosynthesis of essential amino acids such as valine, leucine, and isoleucine. Once the plant is treated, the lack of these amino acids causes an immediate cessation of cell division and growth. Consequently, susceptible weeds stop competing for nutrients within hours and eventually succumb to the treatment.

This herbicide is specifically designed for use in rice paddies to manage a wide range of broadleaf weeds and sedges. It demonstrates both foliar and soil activity, which provides the added benefit of pre-emergence control for later-germinating weeds. Its ability to be applied into the irrigation water makes it highly versatile for flood-irrigated agricultural systems.

When applying Pyrazosulfuron-ethyl, it is essential to manage water levels in the paddy fields effectively. The concentration of the active ingredient depends on the depth and stability of the water layer. Farmers should strictly follow the recommended application timing to ensure maximum efficacy against target weeds while maintaining the physiological health of the rice crop.

Safety precautions must be strictly observed, including the use of personal protective equipment to prevent skin and eye contact. While Pyrazosulfuron-ethyl is generally considered to have low toxicity to mammals, it must be handled with care to avoid contamination of adjacent aquatic ecosystems. Storage should be in a cool, dry, and well-ventilated location, ensuring the chemical remains stable for long-term use.

• Inhibition of ALS enzyme.
• Systemic mode of action.
• Effective against broadleaf weeds and sedges.
• Suitable for soil and foliar application.
• Excellent crop selectivity in rice.