North American Fruit Explorers mailing list at ibiblio

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

Burr knot of apples.  Related to crown gall.  Certain rootstocks, and apple varieties,  are more susceptible to the condition than others.  Some sources say the tree is non productive with them, but others say they can be controlled with Gallex, a treatment for crown gall.
I've seen apples that had the knots but were apparently healthy and productive, so your neighbors have to decide if the problem is bad enough to remove the tree.
-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. 
For even more grape lessons, go to  http://www.grapeschool.com
For growing supplies and more;  http://www.grapegrowersolutions.com

On Jun 23, 2007, at 8:59 PM, Mark & Helen Angermayer wrote:

 
One of my neighbors has a couple of diseased apple trees that have severe cankers all over.  They've had these cankers for many years, but the trees continue to survive.  Both trees produce fruit.  I have never seen the typical fireblight symptoms of black shepherd crook twigs, but there are small mummified black fruits left over from last season on at least one of the trees.  Additionally, one of the trees shows symptoms of CAR on the foliage, but the other shows no CAR.  As far as I can tell there doesn't seem to be any major scab going on.  Except for the CAR on the one tree, the leaves look fairly clean.  Any ideas what may be producing these ugly cankers?  Oh, by the way, there is a third apple tree right in the middle of the diseased ones that doesn't have any cankers.
 
Here are some photos:
 
http://www.nafex.org/uploads/apple%20canker1.jpg
 
http://www.nafex.org/uploads/apple%20canker2.jpg
 
http://www.nafex.org/uploads/apple%20canker3.jpg
 
Thanks,
Mark
Zone 5 Kansas
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