[NAFEX] RE: Malus fusca

Lon J. Rombough lonrom at hevanet.com
Sun Apr 10 11:50:25 EDT 2005

Depends a lot on where the seed source came from, as well as if it was 
pure.  I have seen natural hybrids of fusca with domestic apples, so 
who's to say the FB susceptibility wasn't introduced.
In any case,  variation in many wild species is so common that 
differences in FB resistance in the wild Malus fusca species wouldn't 
surprise me.  It just points up the value in screening a collection of 
material from difference sources/locales to find the best, if it is to 
be used as a rootstock.  It's a very widespread species, going quite 
far north, clear up to Alaska, so there is bound to be lots of 
variation worth testing.
-Lon Rombough
Grapes, writing, consulting, my book, The Grape Grower, at 
http://www.bunchgrapes.com  Winner of the Garden Writers Association 
"Best Talent in Writing" award for 2003.
On Apr 10, 2005, at 8:36 AM, Philip Stewart wrote:

Not all Malus fusca is fire blight resistant...though
there are certainly very resistant individuals,
susceptible trees are not terribly uncommon as well.
If I recall, Jim Cummins (or maybe some one else)
tried M. fusca in the Geneva rootstock breeding
program, and the results were not especially
inspiring. I wish I could remember, but I think he
said 25% of seedlings were FB susceptible.

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