North American Fruit Explorers mailing list at ibiblio

[Bob Bors <bob.bors@usask.ca>]

There are 3 common causes that I know of:

Peach borers will attack prunus species. They lay their eggs which hatch and
eat into the wood. But maybe this is too early in the year for that? Maybe
if there was a borer last season in that spot it would have sap flowing out
now? If you cut off the branch slice it open and look for a worm hole.
A bacterial disease can cause it.  Needs an injury to get inside so if
pruning it out disinfect pruners with every cut.
Winter or other physical damage that has caused some cracking of the bark.
Somewhat common on varieties that aren't cold hardy enough.

We see it sporadically in our cherries at the university but at a low level,
maybe less than 2%.  For us it hasn't ever taken over so we don't do much
about it.  A visiting entomologist found a peach borer after trying several
bushes but it wasn't present in other bushes.  For us the gummosis is
commonly close to the ground.  Many trees recover from it but some seem to
linger with poor health.  I assume the later were those seedlings that
weren't hardy enough anyway.

Bob Bors
U of Sask.

-----Original Message-----
From: nafex-bounces@lists.ibiblio.org
[mailto:nafex-bounces@lists.ibiblio.org] On Behalf Of Bob Hartman
Sent: May-01-12 10:31 PM
To: nafex mailing list at ibiblio
Subject: Re: [nafex] Gummosis?

Probably it is not responded to because there are so many possible causes
and to say this or that is the cause might not be the cause at all.  There
is a general good answer at this website.  Go to
http://pep.wsu.edu/hortsense/.  Click on tree fruits.  Click on Cherry. 
Click on Gummosis.  This information is put out by Washington State
University.
Bob
Western Washington

-----Original Message-----
From: Steve
Sent: Tuesday, May 01, 2012 9:01 PM
To: nafex mailing list at ibiblio
Subject: Re: [nafex] Gummosis?

I see that nobody wanted to touch that one!



On 4/28/2012 12:19 AM, Steve wrote:
> I have never had gummosis on my trees, but I have seen it destroy a 
> Northstar cherry on my mother's property (650 miles away). As I 
> understand it, it's not really a disease but a symptom of a disease of 
> bacterial or fungal origin or sometimes insects.
> Maybe I have it now. last Friday (before winter returned) I finished 
> my pruning and I happened to notice some gelled sap on one branch of 
> my Opal plum. This is a young tree, my only plum that hasn't produced 
> any fruit yet. The location is on a small scaffold branch about half 
> an inch in diameter (where the problem spot is located). There is a 
> slit in the bark about a half inch long with sap oozing out. I pressed 
> around the area and found the adjacent bark to be soft and more sap 
> was expressed when I pressed on the soft area.
> So, should I panic and amputate the entire branch or start out being 
> more conservative? I'll give the rest of the tree a closer inspection 
> when the snow stops again, the wind chill stops being in the teens, 
> and I can enjoy being out there.
>
> Steve in the Adirondacks
> __________________
> nafex mailing list
> nafex@lists.ibiblio.org
> aubscribe/unsubscribe|user config|list info:
> http://lists.ibiblio.org/mailman/listinfo/nafex
> message archives
> https://lists.ibiblio.org/sympa/arc/nafex
> Google message archive search:
> site: lists.ibiblio.org/pipermail/nafex [searchstring] nafex list 
> mirror sites:
> http://nafexlist.blogspot.com/
> http://groups.google.com/group/nafexlist
> https://sites.google.com/site/nafexmailinglist
> Avant Geared  http://www.avantgeared.com
__________________
nafex mailing list
nafex@lists.ibiblio.org
aubscribe/unsubscribe|user config|list info:
http://lists.ibiblio.org/mailman/listinfo/nafex
message archives
https://lists.ibiblio.org/sympa/arc/nafex
Google message archive search:
site: lists.ibiblio.org/pipermail/nafex [searchstring] nafex list mirror
sites:
http://nafexlist.blogspot.com/
http://groups.google.com/group/nafexlist
https://sites.google.com/site/nafexmailinglist
Avant Geared  http://www.avantgeared.com 

__________________
nafex mailing list
nafex@lists.ibiblio.org
aubscribe/unsubscribe|user config|list info:
http://lists.ibiblio.org/mailman/listinfo/nafex
message archives
https://lists.ibiblio.org/sympa/arc/nafex
Google message archive search:
site: lists.ibiblio.org/pipermail/nafex [searchstring] nafex list mirror
sites:
http://nafexlist.blogspot.com/
http://groups.google.com/group/nafexlist
https://sites.google.com/site/nafexmailinglist
Avant Geared  http://www.avantgeared.com