North American Fruit Explorers mailing list at ibiblio

[rob hamilton <lostman_amiga@yahoo.com>]

Have you or anyone else observed any dramatic changes
in blooming patterns based on rootstock?

Robert

--- Kevin Bradley <kbradley@ttlc.net> wrote:
> Dave, from MN wrote:
> 
> I think the main benefit from having a hardy
> understock for a tender
> tree
>  > is induction of early dormancy of the cultivar by
> the rootstock.
> 
> I have never seen a rootstock induce early growth in
> its grafted  cultivar 
> and so perhaps falsely assumed that it would not
> induce early dormancy. I 
> will check this this fall on my topgrafted peaches
> on p americana compared 
> to those on maheleb.
> I have seen a ranetka sucker break bud under a
> dormant Sweet 16 that broke 
> bud exactly the same time as those grafted on
> antonovka that is, about 10 
> days later on average. In other words, the rootstock
> had absolutely no 
> influence on the bud break of the cultivar.
> I am nearly convinced that the main advantage to
> topworking is the "tender 
> crotch/trunk" theory, that is that the weak links in
> deep winter cold 
> endurance are the crotches and trunks and not the
> outer branches. I don't 
> think I buy the "inducement" theory (of inducing
> hardiness from hardy 
> frames to tender grafts.)
> There were some recent experements on this but very
> poorly conducted 
> planned and inconclusive in my opinion.
> I speak, BTW, not as a plant physiologist but as an
> amateur who reads a lot 
> on this subject and who makes observations in the
> nursery.
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