Fireblight?

Rogerius,

I cannot tell you what the problem is but I'd like to suggest that you re-post with a new heading that attract more attention such as "Please help identify this disease on my apple tree" or something like that.

The subject of your posting is too broad. This could be why it does not attract a lot of people. When you narrow it down to "diseases on apple trees". It is likely to catch the eyes of many who grow apple trees and have knowledge to share.

You did a good thing by posting the picture. Now you need to re-post with attention grabbing subject line.

My first thought was like Doglips, possibly a fire blight canker. Have you seen any shepard's crocks and blackened foliage on new growth?

The signs are easier to spot on active growth. But below are some canker pictures.

If it is FB cankers they need to be pruned out.

Here is a link that might be useful: FB canker pictures

This post was edited by fruitnut on Mon, Jan 14, 13 at 23:08

It looks like pruning may not be an option if this the whole tree. If you have other trees that could be affected get it out of there, and burn it, no mulching it isolate tree at a minimum if you want to try and save it.

Unfortunately our plant medical knowledge has only advanced to the civil war era. Amputation is the recommended treatment all too often, if you decide to go that route, get it all take greenwood with it, and clean/sterilize your cutters afterwards.

Treat any disease the way you would the plague.

But is this a disease?

Part of that particular apple tree looks as if it was damaged. I have a few questions: 1) Could the tree have been damaged by deer? 2) What direction is the damage of this tree facing? 3) Is the damage on all the trees facing the same direction? 4) Did you get a sudden cold spell before the trees went dormant?

Hi rogerius,

could you tell me where did you buy your trees?
Thnx.
Rina

Thank you for all the good advice and I'll try to answer at couple of questions:

1) Could the tree have been damaged by deer? - no
2) What direction is the damage of this tree facing? - south
3) Is the damage on all the trees facing the same direction? - no. Some trees have just the long yellowish mark as per attached picture below.

I bought all the trees from Connor Nursery in Waterdown, Ontario.

This post was edited by rogerius on Wed, Jan 16, 13 at 22:07

There is such a thing as a "bark miner". The lower image gives the distinct impression of trails.

I learned something new again:)

rogerius,

Hopefully now you can rest easy.

Here is a link that might be useful: Bark Miners