Rex Plus

Engineering Synergy of Active Ingredients

The fungicide "Rex Plus" by BASF SE is a classic example of a balanced formulation where the combination of two potent components provides comprehensive protection for cereal and beet crops. The basis of the product is epoxiconazole—the "gold standard" of triazoles, known for its high systemic activity and ability to rapidly penetrate plant tissues. However, "Rex Plus" goes further by adding fenpropimorph, which radically changes the dynamics of impact on pathogens.

Why the Epoxiconazole + Fenpropimorph combination matters

In practice, agronomists face the challenge of fungal resistance. Combining these two substances works on a "double hit" principle:

• Epoxiconazole blocks the biosynthesis of ergosterol in the fungal cell membranes, halting its growth and development.
• Fenpropimorph belongs to the morpholine class and affects different enzymatic processes, creating a synergy effect. It accelerates the penetration of the triazole into the leaf and ensures faster curative action, which is critical during epidemic periods.

Technical Application Parameters

The product is formulated as an aqueous emulsion, ensuring the stability of the working solution and uniform distribution across the leaf blade. Due to its contact and systemic action, it not only cures existing lesions but also creates a long-lasting protective barrier.

Key Characteristics:

• Application Rate: 0.6–1 L/ha depending on the level of infection and the crop.
• Flexibility: Effective against a wide spectrum of leaf spots, rusts, and septoria.
• Safety: Belongs to Hazard Class 3, requiring standard precautions when handling pesticides.
• Limitations: The pre-harvest interval is 30 days. Up to two treatments per season are permitted.

The use of "Rex Plus" is justified in fields with a high risk of disease, where reliable fungicidal protection with proven effectiveness against the most dangerous cereal and fodder beet pathogens is required.