Sunflower SHTR 4403

Technological potential of the Strube ŠTR 4403 hybrid

German breeding by Strube in the ŠTR 4403 model implements a comprehensive approach to sunflower protection, focusing on two critical aspects: weed control and phytosanitary security. Integration of resistance to imidazolinone herbicides (Clearfield/Euro-Lightning technology) fundamentally alters the strategy for managing broomrape and hard-to-control weeds, enabling chemical weeding without damaging the crop.

Phytosanitary shield

The genetic profile of ŠTR 4403 includes reinforced resistance mechanisms against key pathogens that annually reduce yields in intensive farming zones:

• White and Grey rot: effective inhibition of head and stem infections at early stages.
• Downy mildew (Peronospora): high resistance to aggressive fungal strains, which is critical for humid regions.
• Phomopsis and Phoma: prevention of tissue necrosis, preserving the photosynthetic leaf area until the end of the vegetation cycle.

These parameters make the hybrid predictable in commercial production. Resistance to Phomopsis combined with herbicide tolerance allows agronomists to minimize losses from both pathogens and the stress factors occurring after pesticide applications. Strube prioritizes the stability of yield potential realization under changing climatic conditions, ensuring high seed fill and uniform maturation.