Alexandra PR

Technological Concept of the Alexandra PR Hybrid

The selection strategy for Syngenta's "Alexandra PR" hybrid is rooted in the principle of comprehensive phytosanitary security. This simple sunflower hybrid is engineered for zones with a high infectious background, where the agronomist's primary goal is to minimize yield losses caused by soil-borne and airborne pathogens.

Biological Potential and Adaptability

With a vegetation period of 100 to 110 days, this hybrid falls into the mid-early segment. This growth dynamic allows the crop to effectively utilize spring moisture and avoid peak temperature stress during the grain-filling phase. An oil content of 50-55% is a strong performance metric for this maturity group, ensuring high profitability when delivered to processing facilities.

Pathogen Protection Strategy

The key feature of "Alexandra PR" is its selection-derived resistance to a broad spectrum of rots. The genetic technical solution is aimed at suppressing the activity of major pathogens:

• White Rot (root and head): Specific resistance genes limit Sclerotinia colonization, which is critical in high-moisture conditions.
• Phomopsis and Phoma: A robust barrier against necrotic stem lesions, preserving the integrity of the plant's vascular system.
• Gray Rot: High-level protection of generative organs during the maturation phase.

Notably, the hybrid possesses genetic resistance to sunflower broomrape. This eliminates the need for complex herbicide strategies to control this parasitic weed, making it a reliable tool for regions with high pathogen pressure.