Alpha-Star WG, herbicide (tribenuron-methyl 750 g/kg)

Mechanism of Action and Selectivity

Alpha-Star WG is a systemic herbicide formulated with 750 g/kg of tribenuron-methyl. The core functionality of this active ingredient lies in its ability to inhibit the acetolactate synthase (ALS) enzyme in target weeds. Once applied, the substance is rapidly translocated through the phloem and xylem to the growing points, effectively blocking the synthesis of essential amino acids (valine and isoleucine). This interruption of protein synthesis halts cell division shortly after application, causing the plant to stop growth almost immediately.

Why Water-Dispersible Granules (WG) Matter

The formulation of this herbicide into water-dispersible granules is a strategic choice for high-precision farming. WG technology ensures that the product dissolves instantly in the tank, creating a stable suspension that prevents nozzle clogging and sediment buildup. For professional agronomy, this means consistent concentration throughout the spraying process, which is vital when operating within the efficient application rate of 0.02–0.05 kg/ha.

Field Performance and Targeted Weeds

Engineered for selectivity, Alpha-Star WG is safe for use on winter/spring wheat and winter barley. Its role as a post-emergence (leaf-applied) herbicide allows farmers to tackle weed pressure precisely when it competes with the crop. It is highly effective against a broad range of broadleaf weeds, including:

• Common lambsquarters (Chenopodium album) and Redroot pigweed;
• Cleavers and Scentless chamomile;
• Shepherd's purse and Common chickweed;
• Pink knotweed and Purple dead-nettle.

By targeting these aggressive species, the herbicide removes the primary nutrient and moisture competitors, allowing the crop to achieve maximum yield potential.

Application and Operational Safety

Classified as a Hazard Class 3 agent, Alpha-Star WG requires standard protective protocols. Designed for a single-application program per season, it offers a sustainable and cost-effective approach to weed management. Because it is a selective systemic herbicide, its application after crop emergence significantly reduces the need for repeated field operations, lowering total fuel and labor costs while protecting soil structure from unnecessary compaction.