[NAFEX] Anchorage of M7 compared to MM 111

Alan Haigh alandhaigh at gmail.com
Sun Dec 7 10:02:29 EST 2008


  Here is what the Ontario Ministry of Agriculture has to say about the two
root stocks.
This tree is about the best in this class, although tree size is about 80%
of standard. Though slightly more vigorous than the old M.2, the anchorage
of MM. 111 is better and the tree seems adaptable to a wider range of soil
conditions. Commercial stocks of MM.111 are virus-free and appear resistant
to collar-rot. As a rootstock in the orchard, M.7 has a history of poor
anchorage, low uptake of potassium and frost-tender roots. Fruit production
is relatively light for the first 10 years, after which ladders are needed
to pick the fruit. Except where previous experience has been favourable,
growers are cautioned against making extensive plantings on M.7.

Purdue University also stressed the tendoncy of poor anchorage of M. 7. in
an advisory I found on the internet.
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