99 Richter | A V. berlandieri x V. berlandieri hybrid created by Franz Richter in 1889 and used as a rootstock. Its natural vigour means it should not be used on fertile sites or, Dr Richard Smart (2015, p628) says, in cool regions because it can delay ripening, adding that its phylloxera resistance is high and nematode resistance moderate. In Roussillon, Gérard Gauby of Domaine Gauby told me he found 99 Richter’s deep root system useful in drought conditions.
Dr Richard Smart in the Oxford Companion to Wine 4th edition ed. Jancis Robinson MW and Julia Harding MW (Oxford University Press, 2015, p628.