Highly resistant to fire blight and is also resistant to crown rot, and root rot (Phytophthora), woolly apple aphid (Erisoma lanigerum) and powdery mildew (caused by Podosphaera leucotricha). A Geneva USA produced rootstock similar to M26 but with the productivity of M9.
Alos it has been shown to have tolerance to the replant disease complex, a phenomenon resulting in poor growth when apple trees are replanted in soil where apple trees had been growing previously.
The rootstock has been mainly tested in New York and New Zealand. In New Zealand they are looking at this rootstock as a possible replacement for M26 since it is more productive than M26. In a 9-year study with the scion cultivar of Liberty, G202 was about 50 percent smaller than M7 but had much greater production efficiency.
A patented rootstock where further propagation is not allowed.
Please be aware that the Geneva series of rootstocks can have very little root growth when shipped. This is quite normal, as when they are planted they will put on growth.