[NAFEX] Winterkill in Black Raspberries???

Michael Dossett phainopepla at yahoo.com
Wed May 27 10:56:25 EDT 2009


There definitely seems to be a correlation with variety and severity of this problem.  For example, in some trials, Allen seems to last a year or so longer without its floricanes completely dying over the winter, however its fruit size drops way off before hand, which makes it just as uneconomical.  This has been a steady problem here in the PNW.  50 years ago the average life of a black raspberry planting was 7-8 years.  It is now half that or less, and it used to be much more than that.  From our research on genetic markers in the named varieties as compared to the wild plants we've collected and that have been sent to us, it appears that all the named varieties are VERY closely related to each other, so its no surprise that they should all suffer from more or less the same problems.

Much like red raspberry, there is no reason why a healthy black raspberry planting can't live for decades, the problem is keeping them healthy.

For what its worth, the only planting I've seen of Pequot here in Oregon does not look very good.  It's on a site with moderate verticillium pressure and the plants have declined very fast, in fact I think the only live floricanes I saw on it was the first spring after the plants were established.


Michael Dossett
Corvallis, Oregon
phainopepla at yahoo.com

--- On Sat, 5/23/09, Jim Fruth <jimfruth at charter.net> wrote:

> From: Jim Fruth <jimfruth at charter.net>
> Subject: [NAFEX] Winterkill in Black Raspberries???
> To: "NAFEX" <nafex at lists.ibiblio.org>
> Date: Saturday, May 23, 2009, 6:01 AM
> Michael Dossett wrote, ""Winterkill"
> is a problem with black raspberries 
> wherever they are grown."
>     I don't think I can agree with the word
> "wherever".  Sure I have 
> unsprouted canes here and there but the problem is never
> wide-spread.  None 
> of the folks that I've sold plants to have ever mentioned
> winter-killed 
> plants either.  Could it be the variety(s) that your
> people have that are 
> the problem?  Everyone here has the Pequot Black
> Raspberry.
>     My plants seem to live eight to ten years and
> I replace 10 to 15% of 
> them every year.  There is one exception though: 
> I have a patch with virus 
> infected plants that have outlived all other plants. 
> These are my most 
> productive except that the berries have too few druplets to
> be worth 
> picking.  Not picking them takes the bird pressure off
> the other areas. 
> I've not replaced them also to try and figure out how the
> virus spreads, a 
> mystery that has baffled me for some years now.  The
> virus doesn't seem to 
> be spread via vectors because adjacent healthy plants don't
> get infected. 
> So what else?
> Jim Fruth
> Brambleberry Farm
> Pequot Lakes, MN  56472
> For jams, jellies, syrups and more:
> www.jellygal.com
> 1-877-265-6856 (Toll Free)
> 1-218-831-7018 (My Cell) 
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