Kober 5BB

Kober 5BB is a well-known interspecific hybrid grapevine rootstock developed from the crossing of Vitis berlandieri and Vitis riparia. In agronomic practice, it is widely recognized as one of the most reliable solutions for protecting European grape varieties against phylloxera, which is a major threat to vineyards worldwide.

The primary utility of this rootstock is its robust root system that effectively resists phylloxera damage. By grafting sensitive cultivars onto Kober 5BB, growers can safely plant vineyards in regions where the pest is present, ensuring long-term survival and commercial productivity of the vines.

This rootstock is particularly valued for its high tolerance to calcareous soils, often handling active lime content of up to 35-40%. This property prevents the development of chlorosis in conditions where other rootstocks might fail due to the inability to properly absorb iron from the soil.

Despite its excellent performance, Kober 5BB is known for its high vigor. If not managed properly, this vigor can lead to excessive vegetative growth and delayed wood maturation in the fall. To mitigate this risk, vineyard managers should implement effective pruning techniques and balance crop load to ensure the vines are adequately prepared for dormancy.

• Excellent resistance to root-knot phylloxera.
• High tolerance to high active lime content in soil.
• Strong growth stimulation for scion varieties.
• Good compatibility with various European cultivars.
• Requires precise pruning and canopy management.

Preventive maintenance when using Kober 5BB involves monitoring soil moisture and nutrient levels. Balanced fertilization is key to preventing physiological imbalances caused by overly vigorous growth, ensuring that the vine directs its energy towards fruit quality rather than just excessive green shoot production.