The present invention relates to a new and distinct variety of apple tree rootstock named `G.202,` which is a hybrid of a cross between a Malus.times.domestic cv. Malling 27 apple tree and a Malus.times.robusta cv. Robusta 5 apple tree. The `G.202` rootstock is a dwarfing rootstock that is resistant to fire blight (caused by Erwinia amylovora) and to crown and root rots (caused by Phytophthora cactorum), and is immune to infestation by the woolly apple aphid (Erisoma lanigerum). The `G.202` apple rootstock is useful in that it can be propagated clonally and used as a rootstock or root system for apple trees, as well as for interstems of apple trees.