Cankers are dead areas of bark, caused by fungi and bacterial infection. Cankers can be found on branches as well as on tree trunks. Such an infection can cause a draw back in annual branch or twig growth. Yet on the stem it can create visually interesting formations which can be deadly to a tree. Organisms which cause a canker formation can enter and infect the bark through wounds. These wounds could be caused by broken branches, or insects which have caused an injury. When canker pathogens pass through the outer bark barrier, they can colonize other bark tissue. Cankers can enhance wood decay, and cause branch breakage or tree death (Tisserat 2004).
canker
Fig 12. Canker on a tree trunk. Picture taken from:
Ned A. Tisserat, 2004 Canker Diseases of Trees, Kansas State University Agricultural Experiment Station and Cooperative Ex tension Service,
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August 21, 2008 at 3:36 am
Hi Mantas,
You visited my blog recently and asked if I would add a comment on your blog, and I think I do have something worth mentioning.
A similar phenomenon to that of cankers in trees is burls. I’m no expert on the botanical aspects of either, but I’ve always found burls interesting from a creative standpoint.
Indeed, many artists use tree burls as a medium for art work. The natural grain of the tree is distorted in bizarre ways within the burl. Artists typically sculpt a bowl (or other shape) out of the burl, and then the grain is brought out by using varnish, etc.
August 31, 2008 at 10:53 am
[...] burr) according to all mighty wiki. So as far as i understand its similar to previously described cancer. According to wiki, its cosed by any kind of stress to a tree,. be it human related humidity [...]