A Precision Solution for Resistant Paddy Weeds: The Bispyribac-sodium "Twin Product" Combo Lays the Foundation for High

As large-scale rice cultivation expands—encompassing direct seeding, mechanical transplanting, and seedling throwing methods—weed communities in paddies are evolving. Issues such as mature barnyard grass, resistant barnyard grass, Leersia oryzoides (cutgrass), and mixed infestations of broadleaf weeds and sedges have become increasingly prominent. Traditional single-herbicide treatments are suffering from declining efficacy, weed resurgence, and rising costs, creating critical bottlenecks for improving rice quality and yield. To address these challenges—including complex weed flora, resistance, and incomplete control—two flagship products in paddy crop protection have been launched as a powerful "twin" combination: 40% Bispyribac-sodium SC (Suspension Concentrate) and a WP (Wettable Powder) blend of 180g/kg Bispyribac-sodium plus 120g/kg Bensulfuron-methyl. With differentiated formulations, complementary modes of action, and stable, long-lasting efficacy, this combination is suitable for a wide range of rice-growing scenarios and stands as a premier solution for managing resistant paddy weeds.

As a highly active ALS inhibitor in the pyrimidinyl-salicylic acid class, Bispyribac-sodium remains a mainstream post-emergence herbicide for rice, prized for its systemic translocation through foliage, dual absorption (via roots and shoots), and ability to eliminate even mature weeds. These two products are precisely positioned to meet distinct field needs: the single-agent product offers rapid control of large weeds, while the mixture provides long-lasting residual control. Together, they form a powerful combination that covers the entire rice growth cycle, effectively overcoming industry pain points such as narrow weed-control spectra, resistance outbreaks, and short residual activity, making them suitable for diverse rice cultivation systems across the country.

Breakthrough Product: 40% Bispyribac-sodium SC – Rapidly Eradicates Mature, Resistant Weeds

The 40% Bispyribac-sodium Suspension Concentrate (SC) utilizes advanced formulation technology, ensuring a dust-free product with excellent solubility and strong crop adhesion, while minimizing the risk of phytotoxicity. Compared to traditional powders, the spray solution is finer and penetrates more rapidly, making it fully compatible with modern mechanized and drone-based application methods. Leveraging the high activity of bispyribac-sodium, the product precisely targets weed meristems, inhibiting branched-chain amino acid synthesis and blocking growth metabolism. It is rapidly absorbed via both the stems/leaves and root systems; weed growth ceases within 3 days, and complete necrosis (yellowing and death) occurs within 7–10 days, ensuring no regrowth.

This product excels at controlling mature, resistant, and troublesome grass weeds—specifically targeting hard-to-control paddy weeds that conventional agents often fail to eradicate, such as 4–7 leaf-stage barnyard grass (including resistant strains), Leersia oryzoides, and Paspalum distichum. It also controls common weeds like Monochoria vaginalis, Rotala indica, and Cyperus difformis. The formulation is safe and gentle; when used according to guidelines, it is highly safe for direct-seeded, machine-transplanted, and broadcast-seeded rice, without hindering tillering, growth, or grain formation. It perfectly solves the growers' dilemma of "mature weeds surviving treatment while small weeds keep regrowing," serving as a key tool for targeted post-emergence weed control during the mid-growth stage of rice.

Synergistic Combination: Bispyribac-sodium + Bensulfuron-methyl WP – Combined Killing and Pre-emergence Control for Broad-Spectrum Efficacy

To address scenarios involving mixed infestations of grass weeds, broad-leaved weeds, and sedges, as well as continuous weed germination, the combination of 180g/kg bispyribac-sodium and 120g/kg bensulfuron-methyl (Wettable Powder) offers complementary modes of action and enhanced efficacy. Bispyribac-sodium specializes in the rapid post-emergence control of large, resistant weeds already present in the field, while bensulfuron-methyl offers dual action—acting as both a post-emergence herbicide and a soil-applied pre-emergence barrier that inhibits long-term weed seed germination. Their synergistic combination overcomes the limitations of single-active-ingredient herbicides, delivering a triple-action effect: killing established weeds, suppressing new weed emergence, and controlling mixed weed populations.

This formulated product provides broad-spectrum control of paddy field weeds. It efficiently eradicates troublesome grass weeds such as barnyard grass and Leersia hexandra; thoroughly controls broad-leaved weeds like alligator weed (Alternanthera philoxeroides), Monochoria korsakowii, and dwarf arrowhead (Sagittaria pygmaea); and eliminates perennial sedges such as rice flatsedge (Cyperus iria), Scirpus planiculmis, and Eleocharis acicularis. It offers a one-stop solution for complex, mixed weed infestations. Upon application, it forms a stable herbicidal layer on the soil surface with a residual effect lasting over 30 days, significantly reducing application frequency and cutting labor and chemical costs. Furthermore, the dual-mechanism formulation effectively delays the development of herbicide resistance, meeting standard weed control needs across major rice-growing regions nationwide.

Comprehensive application coverage, meeting the needs of large-scale, eco-friendly farming

Both products are selective herbicides designed specifically for rice fields. Their safety has been validated through field trials across multiple locations, and they are compatible with a full range of rice cultivation methods, including water-based direct seeding, dry direct seeding, mechanical transplanting, seedling broadcasting, and manual transplanting. They can be used with confidence in indica rice regions; adhering to strict application guidelines effectively mitigates the risk of phytotoxicity. In practical field use, the two products play distinct yet complementary roles: 40% Bispyribac-sodium SC focuses on targeting large, resistant weeds during the mid-to-late growth stages, precisely solving stubborn weed problems; the Bispyribac-sodium + Bensulfuron-methyl WP formulation handles routine post-emergence whole-field weeding combined with long-lasting soil suppression, making it ideal for early-stage prevention and mid-stage comprehensive control. Used in combination, they create a weed-free growing environment throughout the entire rice life cycle. Moreover, the product aligns with the trend of green agricultural development; it ensures regulatory compliance with low residue levels and excellent environmental compatibility. It preserves soil ecology and supports healthy rice growth—safeguarding seedlings, tillering, and overall yield—thereby securing high and stable production right from the weed control stage. Compared to traditional herbicides, this "twin" product combination offers low dosage requirements, rapid action, long-lasting efficacy, and strong resilience; it withstands minor weather fluctuations and rainfall, delivering stable field performance that significantly simplifies weed management for growers.

Industry Empowerment: Precision Weed Control for Cost Efficiency and Industrial Upgrading

As rice cultivation moves toward large-scale and intensive operations, there is a critical industry demand for weed control solutions that are efficient, safe, long-lasting, and cost-effective. The newly launched Bispyribac-sodium-based "twin" product combination directly addresses key industry challenges—such as increasing herbicide resistance, complex weed populations, and high labor costs. By utilizing differentiated formulations, scientifically optimized mixtures, and consistent field efficacy, it provides a comprehensive, one-stop solution for rice crop protection.

Looking ahead, backed by mature formulation technology and extensive field application experience, this product series will continue to deepen its presence in the paddy weed control sector. It will further refine strategies for managing resistant weeds, empower green, high-quality, and efficient rice cultivation through advanced crop protection technology, help growers manage weeds with ease while securing stable yields and increased income, and inject strong momentum into the high-quality development of the rice industry.