5 BB Kober or 5 BB Teleki is a V. berlandieri x V. riparia hybrid used as a rootstock. The alternative names arise from the fact that, as Dr Richard Smart (2015, p.627) explains ‘the seedling was raised by the Hungarian Sigmund Teleki from seeds produced by a French nurseryman. In 1904, some of the most interesting plants were sent to the Austrain Franz Kober, who selected 5 BB.’ Dr Smart (ibid.) adds that 5 BB is ‘quite a vigorous rootstock suited to more humid, clay soils. In many situations vigour is excessive. [It] is widely used in Europe, especially in Germany and Switzerland.’ It has good resistance to nematodes.
5 BB is said to be the least reliable of the berlandieri x riparia hybrids, its quantity over quality not always ideal in cooler regions. In Bordeaux 5 BB was planted on the unsuitable, compact, clay soils of the right bank in the 1960s during supply shortages of its V. berlandieri x V. riparia soul mate, SO4.
Dr Richard Smart in the Oxford Companion to Wine 4th edition ed. Jancis Robinson MW and Julia Harding MW (Oxford University Press, 2015, p.627.