STUBBORN

A Reliable Foundation for Stone Fruit Orchards

"Upryamets" is a selection achievement from the N.I. Vavilov Research Institute (VIR), designed for growers who plan to establish plum and cherry plum orchards in areas with high infectious pressure. Using this rootstock significantly mitigates the risks of crop loss due to fungal diseases right from the tree formation stage.

Agrotechnological Advantages

• Resistance to Clasterosporium Blight: This is the standout feature of the variety. Under high-humidity conditions, where shot-hole fungus can destroy up to 40% of the leaf's assimilative surface, "Upryamets" resists infection, maintaining the overall health of the graft's canopy.
• Universal Compatibility: The variety has undergone field testing and demonstrated excellent graft union indices with cherry plum, European plum, and Japanese plum. This makes it a workhorse for nurseries managing a diverse range of stone fruit species.
• Nursery Efficiency: The rootstock produces a high output of standard seedlings, reducing overall orchard establishment costs. Its root system ensures a strong start for the graft during the first year after field planting.

Practical Application Scenarios

Commercial growers choose "Upryamets" for intensive orchard systems where trunk longevity and predictable tree development are critical. It is highly recommended for sites prone to moisture stagnation or in locations surrounded by older, infected trees—the rootstock acts as a biological barrier, preventing pathogens from colonizing the graft via sap flow.

While the rootstock's high adaptability is a massive asset, it does not replace the need for fundamental crop protection. However, it does allow for a leaner fungicide budget, enabling growers to reallocate resources toward precision nutrition and canopy management.