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nafex - Re: [NAFEX] Replanting interval on blackberries

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  • From: Michael Dossett <phainopepla@yahoo.com>
  • To: North American Fruit Explorers <nafex@lists.ibiblio.org>
  • Subject: Re: [NAFEX] Replanting interval on blackberries
  • Date: Wed, 15 Oct 2008 13:48:06 -0700 (PDT)

There are fewer and fewer chemicals available to control crown borer.
Diazinon used to be the recommended product, but the EPA has been trying to
phase it out for years and it lost its label for use in caneberries several
years ago. I've heard that Guthion has some effectiveness but not as good as
diazinon. I've also heard of people using parasitic nematodes with mixed
success. There is a group working on a pheromone trap for the crown-borer
moth, but so far they have not been able to isolate the compound. In a
nutshell, there are a few chemicals out there with some efficacy, but the
list seems to get shorter every year and raspberry crown borer can be a
difficult pest to deal with.

As for the blackberries not fruiting, I'm not sure. Did they flower normally
and just not set or did they not even flower? I wonder if double blossom or
some other fungus is the culprit although that wouldn't explain the problem
with the cherries...

Michael

Michael Dossett
Corvallis, Oregon
www.Mdossettphoto.com
phainopepla@yahoo.com


--- On Fri, 10/10/08, Mark Angermayer <hangermayer@isp.com> wrote:

> From: Mark Angermayer <hangermayer@isp.com>
> Subject: [NAFEX] Replanting interval on blackberries
> To: "North American Fruit Explorers" <nafex@lists.ibiblio.org>
> Date: Friday, October 10, 2008, 6:50 PM
> MessageMichael,
>
> I don't know for sure why commercial growers in this
> area replant so soon.
> The guy I was talking to (Dr. Pat Byers out of MU) talked
> like it had
> something to do with a Rasp. Crown Borer buildup. He said
> he's dug up
> plants with multiple borers on each plant. I'm
> battling this myself, but my
> understanding is it can be chemically controlled. I've
> heard Capture is
> effective. Why commercial growers wouldn't use it, I
> don't know.
>
> Evidently commercial growers just aren't that adverse
> to replanting. To
> wit, commercial strawberries are replanted annually around
> here. Doesn't
> make sense to me, but I'm sure it offers the most
> production in a commercial
> setting.
>
>
> Change of subject, but today I was talking with a fella
> who's blackberries
> didn't fruit this year. He seemed to know a fair
> amount about blackberries
> but was at a loss as to why they didn't fruit. He said
> he had lots of
> foliage growth, and a few small berries that shriveled up,
> but that was it.
> I quizzed him about pruning, and as far as I could tell he
> was pruning
> correctly. Asked him about over-fertilizing, and he said
> he didn't put any
> more fertilizer on than normal. I was puzzled because my
> blackberries
> produced heavily, and this guy lives only about 10 miles
> from me. We didn't
> get a late frost this year. Any ideas? Oh, also he said
> his cherries
> didn't fruit either.
>
> Mark
> KS
>
>
>
>
>
>
>
> Michael wrote:
>
> Mark,
>
> It could be contamination or it could be a sport. We have
> a plant here that
> we call "early Marion" which was a sport
> (can't remember whether it
> originated in a growers field or in one of ours) that
> consistently blooms
> ~3-4 days or so earlier than Marion but is identical to
> Marion in all other
> respects. Though with something that suckers and forms a
> hedge like
> 'Ouachita' it would be a little more difficult to
> tell I suppose.
>
> The 7 year figure surprises me a little but not so much. I
> wonder what
> problems they have that they feel compelled to replace
> their plantings so
> quickly. The average life of a red raspberry planting in
> Washington is
> around 7-8 years because of disease issues and black
> raspberries here in
> Oregon are around 3 years. A healthy planting of either
> should remain
> productive for decades. I'm sure establishment of
> offtypes in the field
> would be more of an issue in such a case but commercial
> fields just aren't
> in for that long.
>
> I've never heard of someone growing Triple Crown
> without a trellis. Not
> that it can't be done. I suppose if you hedged the
> primocanes off short
> enough you may be able to get them to stand up on their own
> for you but
> you'd be losing a lot of the crop load in order to do
> so. I have a hard
> time seeing it being grown successfully without support and
> still living up
> to its potential. While they come out of the ground stout,
> the canes can be
> a little limber, especially after they branch. Atleast
> they're thornless so
> tying up the canes is a little less of a chore than
> otherwise :-)
>
> Michael
>
> Michael Dossett
> Corvallis, Oregon
>
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