I have a small plant that I budded about three years ago, from budwood sent to me as a form of Flying Dragon x Citrus sinensis. In other words the same or similar hybrid to 'Dragon Lime'.
It has developed areas of destroyed wood and bark, which start as small brown splits. I thought at first this was frost damage, but I kept it inside last winter and the problem continues. Sometimes it seems to occur around thorns. See pictures at
http://www.homecitrusgrowers.co.uk/temp/temp3.html
This looks very similar to canker that occurs on apple trees in England, but doesn't look like the pictures of citrus canker I have looked at. There are no leaf lesions - no fruit yet to study.
Do you think this is citrus canker?? Or what??
Mike.

Are the leaves affected? Citrus canker pictures I have seen show it on the leaves.

here is a link that describes it and has some pics---( I don't think your problem is canker). http://ccpp.ucr.edu/news/CitrusCanker&HuanglongbingDiseaseJan07.pdf

I'm no expert but it almost looks like gummosis. Malcolm Manners should be a big help to you.

definitely not citrus canker. Could be cold injury. Or is there a possibility of copper deficiency? Does your fertilizer contain any Copper at all? Do these lesions ever bleed gummy sap, and are the branches recurved (i.e., they bend over under their own weight, then curve back upward at the tips)? Copper deficiency is rather rare in the field, but in a potted plant, I suppose it's a possibility, if you're not providing any source of the element.

Malcolm

I'm glad you all agree its not citrus canker!
I feed all my potted plants with a soluble balanced feed containing trace elements (including copper), plus extra nitrogen feed in spring and summer.
Just this one plant is affected. There is no gum formation, and the wood surrounding the 'holes' does try and regrow. Leaves are completely normal. New growth is bent - but then this is a Flying Dragon hybrid.
I think I'll just ignore it and see what happens. But I certainly won't use this as the budwood source I had hoped for.
Mike.

I have a calamondin that have the same lessions that you have in the picture and my Chandler pomelo. My other calamondins and other citrus somehow escappe thiis malady.
I attributed this to the cold snap that we had last January.
But the branches are still sprouting new buds all over.