How Bensulfuron-Methyl Supports Targeted Weed Control in Rice Cultivation

Introduction

Bensulfuron-methyl is a selective, post-emergence herbicide primarily used in rice paddies to control broadleaf weeds, sedges, and certain aquatic weeds. Its high selectivity and low use rate make it a preferred option for efficient weed management in flooded rice systems.

Product Information

• Name: Bensulfuron-Methyl

• Chemical Name: Methyl 2-[[[[(4,6-dimethoxypyrimidin-2-yl)amino]carbonyl]amino]sulfonyl]benzoate

• CAS Number: 83055-99-6

• Appearance: Off-white crystalline powder

• Formulations: WDG (Water Dispersible Granule)

• Patent Status: Patented – No commercial supply available

Key Features

• Highly selective: Safe for transplanted and direct-seeded rice

• ⚡ Low application rate: Effective at grams-per-hectare levels

• Post-emergence action: Targets weeds after germination

• Residual activity: Provides prolonged control in paddy conditions

• ALS-inhibiting herbicide: Unique biochemical pathway for weed elimination

Applications

Bensulfuron-methyl inhibits acetolactate synthase (ALS), an enzyme critical to amino acid synthesis in susceptible weeds. This disruption halts growth, leading to weed death while leaving rice plants unharmed.

Advantages

• Precision control in flooded rice ecosystems

• Minimal crop injury due to selectivity

• Reduces weed competition, improving rice yield

• Compatible with tank mixes for broader-spectrum control

Limitations

• Currently under patent restrictions (not available commercially)

• Ineffective on grasses—requires additional herbicides for full control

• Risk of ALS-resistant weeds with repeated use

FAQs

Q: Why is bensulfuron-methyl patented with no supply?
A: It remains under intellectual property protection, limiting its availability for commercial sale.

Q: Can it be combined with other herbicides?
A: Yes, it is often tank-mixed with grass herbicides in rice paddies for complete weed management.

Q: Is it safe for aquatic environments?
A: It is designed for flooded rice paddies but must be applied under strict guidelines to avoid off-target contamination.

Conclusion

Bensulfuron-methyl is a specialized herbicide for rice weed control, combining high selectivity, low application rates, and effective action on broadleaf weeds and sedges. However, due to patent restrictions, its commercial supply is currently unavailable.