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["Lon J. Rombough" <lonrom@hevanet.com>]

Probably, though I don't know what exact temperatures trigger the condition, so a tree in a warmer microclimate might produce doubles when a tree of the same variety elsewhere might not.  I believe the full information is in Temperate Zone Pomology by M.N. Westwood.
-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 Jun 14, 2006, at 9:26 AM, Richard J.Ossolinski wrote:

Lon,
So the inherited trait is variety specific, as opposed to tree specific?
Thanks,
Richard
Gouldsboro, ME Zone 5
On Jun 14, 2006, at 12:09 PM, Lon J. Rombough wrote:

> Doubles are an inherited trait that is triggered by higher than usual  temperatures at bloom time.  "Bing" cherry will produce a lot of doubles in California's central valley, but almost none here in the NW.  Dr. H.P. Olmo grew out seedlings of Bing and selected some that resembled Bing, but produced a much lower percentage of doubles.   At least one was released under the name of Brooks.
> -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 Jun 14, 2006, at 9:01 AM, John Barbowski wrote:
>
>  
> I have notice an anomaly that is interesting. About 20% of the plums are doubles.
> Is this a normal occurrence for plums or could it be a result of the previous 
> year's trauma?  
>  
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