Apple borers

Athens, Greece

I discovered this on our apple tree. Looks like some nasty things are boring in the trunk and branches. Any suggestions what it might be and how to treat it/ prevent it from affecting nearby fruit trees?

Thanks!

Thumbnail by aHtm1324 Thumbnail by aHtm1324
Contra Costa County, CA(Zone 9b)

If you scrape off the orange goo, is there any damage under it? Can you take a picture of that damage?

The tree has been very poorly pruned, leaving stubs like that.

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